Can A Bad Belt Tensioner Cause Rough Idle

Allow engine to idle, and determine if noise is noticeable. Then put a 14mm wrench on the bolt at the bottom of tensioner bolt and crank the bolt clockwise to loosen (it is reverse threaded). Could be a bad motor mount or trans mount. If you have access to a scope, check the cam and crank patterns. replaced spark plugs & 2 coils on #1 and #3 cylinders. I have a 98 S-10 ZR2 with the 4. Does anyone know what could be the cause of my hesitation and rough idle issues? I've been reading a couple of threads saying that the throttle position sensor can cause these symptoms. The only things I have tried so far to fix the problem is change air filter, spark plugs and clean throttle body but none of these things have solved problem. Tech A notices a missing fan shroud and says that could be the cause of the problem. The bearings on these can start making noise, also. That means when your belt breaks, slips and, ultimately, wears out, everything—from the power steering pump to the alternator and air conditioner—stops working. Recently the car stalls as soon as I try to drive off from a complete stop. The drive belt tensioner pulley is the lower one that's out of line with the rest of the pulleys. Check your belts to ensure there is proper tension and the belts are not damaged. Tonight I cleaned the throttle body as detailed here: DIY 2AZFE Throttle Cleaning Gen 5, Gen 5. Belt looked good 132k kms on it. He had the new injector he gave me when I bought it. It is a more comprehensive test with it removed. Bad reeds can cause the motor to flood out, but I think the 400 is piston port. The symptoms do not seem the same as they did when my RX8 coils started going bad. When i drive it loses power and stutters when i try to accelerate. Newer EPDM belts do not crack like neoprene, and require a belt gauge to check for wear. No check engine light. Thanks Neil I'll give them a call. If it's misaligned, check for a damaged tensioner that may have allowed the chain/belt to slip a tooth or several teeth. failing belt tensioner accelerates wear on the whole system including the "free wheel/pulley" and major impact on shortening the life of your air con compressor. The notches in a belt can cause noise. Holy crap, I've had a rough and erratic idle on my 98 A4 1. What Is Causing My Car’s Squeaks, Creaks, and Clunks?. Turn the crankshaft 2 1/6 turns clockwise Verify the timing marks are still correctly aligned. Any noise that sounds like a squealing, whirling, or chirping might be a sign that the tensioner is weakening. The other day, it started making a little bit different sound, and I came to the realization that the problem is actually the alternator bearings. The squeaking, squealing and grinding noises can certainly get on your nerves, but the potential problems caused by a bad tensioner are far more than just casual annoyances. A cam that was a tooth off would cause a rough idle but then so can a dirty throttle body. It has a rough idle and shakes a lot. 4 can be tricky for someone to get in time if they aren't experienced with it. We wrote about something similar on the Prius, being a common cause of the MIL. 2006 Dodgr Stratus SXT Timing Belt Replaced - Rough Idle My car has 103000 miles on it and the timing belt was replaced several hundred miles ago. Could be a bad motor mount or trans mount. Information on repairing your 2001-2004 F150 with the 4. It is also possible that the middle groove on the idler pulley has grown wider. About two weeks ago, I started to notice the engine stumbling a bit when I'd come to a stop. My 2009 Accent has recently been idling rough. A faulty EGR is the most widely known culprit but there is another source that can potentially choke your engine, the PAIR(AIV). A comprehensive technical guide to the various VAG group 2. If you’re worried about it going out best to buy a new one and keep on board along with spare belt ( new or old) just in case. idle dropped down to about 750-1000 and rough, then died. Last week, we had the timing belt changed by a mechanic I've gone to for the past four years and trust a great deal. Malfunctioning driven pulley on Jackshaft 5. Definitely worth it for the extra $3 per fill-up. I thought maybe bad gas. A faulty alternator can fast idle issues; if so, replace it. If the noise is coming from the tensioner, it is time to replace it. yes ur belt can b worn or ur tensioner can b wornwhich can allow the belt to slip which in turn effects the water pump and the alternatorso electrical issues can cause rough idlealso water flow can cause car to go in and out of "limp mode" for overheating. Had new code for EGR. When the vibrating occurs, the increased angle should take away most of the vibration. Now, at idle, the RPM'swill drop, there will be a screaching noise from the pully area and the engine will die. Water Pump Failure - What Are The Common Failure Warning Signs To start with, Water Pump Failure can be extremely hard to diagnose. this can be done by releasing tension on the drive belt tensioner and removing the serpentine belt. A rough idle, out of range self-adaptation values, and oxygen sensor codes are typical indicators that the sensors need to be replaced. im thinking about selling the car because im tired of the headache with the rough idle. how to fix a rough idling 1. BTW, the transmission mount on the drivers side is bad and one is on order. customer states serp belt tensioner is bad verified belt noise. I've read on other forums it should be around R500 to replace for a non-GM part. Instead of 16mm for the Chevy, I turned it down to 12mm for the Toyota, and rethreaded the stud portion from 5/8" fine to 7/16" coarse. You can also remove the belt and run the engine. Never did a leak down. The cause of the problem is the rocker shaft bridge has excessive clearance from the factory, which causes the rocker shaft to rotate and make noise. I didnt slacken the three injection pump pulley retaining bolts. If you have a belt noise or vibration and you’ve changed the belt, it’s time to test your belt tensioner. Often the valve can get stuck in the open position and cause a rough idle. The same noise can appear if you have air trapped in the system. I have an estimate for $190 out the door for parts and labor for the tensioner and belt. About two weeks ago, I started to notice the engine stumbling a bit when I'd come to a stop. · Damaged drive belt. A bad pulley can cause fraying on the edges of the belt, and in severe cases can even cause it to break. A bad idle-speed control unit can cause the problem; it may need to be replaced. Idle self-adaptation values above four percent are typically a cause for concern. You can usually get away with replacing them with every other belt change, but they can fail and cause bent valves at inconvenient times; I had an idler fail without warning in the middle of a 500 mile trip. I hear rumors that the tensioners can go bad as they do on other cars. 0 V6 24V 166kW ex: AR 156 2. could the timing belt be the cause maybe? my xt has close. Doesn't run bad on it, just not great. This can lead to a rather loose pulley, unable to maintain the tension on the drive belt system so that the drive will not slacken. Remove the belt once it is loose, then remove the two 14mm bolts from the block and the bracket itself. Belt-driven accessories fail. Solution: Replace the tensioner. When this happens, the bimetal spring doesn't heat up quickly enough causing the choke to open too slowly. The notches in a belt can cause noise. This is because the fuel injectors are responsible for putting fuel into the engine. Anyway wonder if any of you can help me out here. 9 litter ford engine in a 93 escort lx 7 Answers. Another symptom of bad or failing drive belt tensioner is failure of the belt driven accessories. A timing belt works in a similar way as a drive belt and can produce similar noises. A bad ISC motor will not cause a rough idle. Replaced EGR. Automatic tensioners tend to wear out at around 100K miles. Now the engine runs rough at idle and I can't seem to get it to hold 650to750 idle without holding the throttle control on the TBI. But neglecting the lower timing-chain tensioner on the 2. 9 litter ford engine in a 93 escort lx 7 Answers. Putting it in reverse, neutral or park and no vibration. drive around town then park for 15-20 minutes. The AC belt system consists of the compressor, harmonic balancer, idler pulley, belt auto tensioner pulley. Can't tell it's running rough on the highway or off idle. rough running at idle if you can verify your fuel pressure is good, points to an air issue or a wear parts failure like mounts. I recommend replacing the idler pulley, as well. Your timing belt may have jumped a tooth or worse, your crank shaft may be broken. If the 'Check Engine' indicator on your vehicle glows continuously, a possible cause may be a malfunction in the idle air control valve. I was misled by one video where they showed some side-to-side wiggle in this tensioner wheel and specifically stated that was the reason it was bad. The only way an exhaust leak can cause a rough idle is if the leak was in a place where it could enter the air intake system. A vacuum leak can be caused by a bad vacuum hose, intake manifold gasket, and other vacuum powered. As a owner you can also retrieve these codes as I've shown in the video below. Never did a leak down. And obviously, check the rear cam alignment. Since you've got over 200k on the car, might as well change that out I'd say. It felt like a rough idle situation you'd see with a bad PCV valve. 0 TDI engines. You can see it when the hood is up. It could also be something REAL SERIOUS like a burnt valve, but start with the simple stuff first. (Please see our articles on tuning One-Screw Carburetors and Two-Screw Carburetors. It is also possible that the middle groove on the idler pulley has grown wider. So many dealerships and mechanics tried to solve this issue, yet not one person said to clean the TB. Switched to 89 midgrade, and she's a totally different truck. Another area of concern is the PCV valve on 4. The causes might vary, but most idle problems are caused by a mixture issue. Install new timing belt "B" over crankshaft sprocket "B", around the tensioner pulley, and over the silent shaft sprocket. Wrong belt installed, a belt that's too short will cause the machine to creep at idle 3. If it's old or stretched out a bit you can have some smoking, but it's usually not going to do that. A worn serpentine belt can cause various parts to slip as the engine is running. A special tensioner tool is available if you don't have a short enough socket from your auto parts dealer. It felt like a rough idle situation you'd see with a bad PCV valve. If you have recently installed a new belt, check the tension by squeezing the belt with your fingers. When the Audi A4 camshaft adjuster seals and valve cover gaskets leak they typically cause a burning oil smell. Some of the most common problems from overheating are: • An overheated cylinder head can crush the head gasket and restrict coolant flow to the cylinders. The car has had an issue with vibration for some time now. However, any pulley wobble means it is cocked or has a bad bearing. For the do-it-yourself mechanic, Many high-idle problems can be identified and remedied with some patient troubleshooting. Completely normal to fall a volt or 2 when warmed and idle RPM has dropped below 1k like you have stated. If the timing belt or chain tensioner loses its strength, the belt/chain has more movement than it should have. However, the most common is an overstretched timing belt or chain, or a bad tensioner after miles of operation. there was a noise that was created heard during cold start up and eventually went away when the engine got warm. On the 944 Turbo and 944S the intake manifold must be removed to access the stabilizer: this can be expensive in terms of labor. SOURCE: Can a bad idler pulley on a 1997 saturn with a 1. A cylinder balance or 'leak down' test may indicate a leaky valve or valve seat (this is not the same as a compression test). I also did the plug wires about 40,000 mile back. Solution: Replace the tensioner. I've read on other forums it should be around R500 to replace for a non-GM part. If it's old or stretched out a bit you can have some smoking, but it's usually not going to do that. A worn automatic serpentine belt tensioner can cause belt squeal, misalignment and belt chirp, and alterantor bearing damage. 9hrs at $80/hr, $72; Injector cleaner – approx. You can tell your vehicle is flex-fuel if there is a "Z" in the 8th position of your VIN: 1GNFK16Z02J14xxxx for example. Spark plugs create the spark that is needed for your car to burn fuel. A timing belt works in a similar way as a drive belt and can produce similar noises. Do not leave any slack on the tension side of the belt (Figure 8). The shop would just have to remove the belt again to replace the tensioner. 7 bank 1 11. This can be seen with a flashlight looking up from under the right front wheel well. By replacing your belt periodically, you can. It runs rough at idle, and surges with power as the rpm increases. There are a few other things that can cause serpentine belt noise tho so before you replace the belt check the following:-The bearings in the tensioner and idler pulleys can go bad. ) The EGR Valve is sticking open. Any noise that sounds like a squealing, whirling, or chirping might be a sign that the tensioner is weakening. If its a bouncing idle you should see the pulley freeze momentarily and then kick back on I have this in my car. To check your clearances, you can insert a thickness gauge between the valve stem and the rocker arm or lifter. A bad plug will also cause it to run rough and have a bad exhaust smell and cause the noise you are hearing at the tail pipe. Your Jetta’s engine creates vacuum when running. The result is a rich fuel condition resulting in a rough idle, excessive fuel consumption and high emissions. The Belt should have about 2 - 3 cm movement which allows you to hook it over the alternator pulley and then release the tensioner. By replacing your belt periodically, you can. At normal speeds it wasn't rough but power slightly low. If this reduces the noise, the cause is excessive clearance, and you’ll need to make the proper adjustments. It makes no sense to me. It’s cheap and you’ll have the. And obviously, check the rear cam alignment. As to the misfire, could it be the timing belt is installed a tooth or two off? Other than those 2 things a rough running engine at idle can be caused by a vacuum leak, low compression, faulty injector spray pattern, etc. Setting a regular oil change maintenance schedule can serve as a benchmark for when other maintenance needs are to be met. Volkswagen / Audi capitulated to a Class Action Suit for those who had to replace tensioners, and/or chains, or had to repair an engine after damage was caused by a failed tensioner. Auxiliary belt tensioner & idler bearings are starting to squeak so am replacing them but again, only £4-£10 for a bearing is peanuts. Inspect the belt for wear. I swapped the new Chevy serpentine belt idler for a Toyota timing belt idler, which is nearly an inch and half wide. The belt is kept tight through the belt tensioner. Sometimes belts will make noise when the humidity is high, then quiet down on dry days. The problem with the short belt life is listed in Lawn Tractor bulletins #13 and #21. · Blades out of balance. The only way an exhaust leak can cause a rough idle is if the leak was in a place where it could enter the air intake system. Cause: Failure of a primary or secondary timing chain tensioner. As the lower bolt for the serpentine belt tensioner broke off due to torquing it down so be careful while doing this. Since you've got over 200k on the car, might as well change that out I'd say. Reinstalling the belt was a bitch needed another set of hands. This is allegedly a result of an ineffective piston design that - according to reports - can get clogged with oil. The rough idle seems to coincide with the pulsing lights. Still get a little rough idle every now and then. Bring engine oil temperature to 160°F (71° C) or above as indicated by the scan tool “EOT” PID. In fact, the fuel pump is one of the main problems we see at our service and performance shop. The only things I have tried so far to fix the problem is change air filter, spark plugs and clean throttle body but none of these things have solved problem. I think part of the reason is that there are so many possible causes of an idle problem, so it ends up being a common issue. At this point I changed the OXYGEN SENSOR. ACDelco 10229114 GM Original Equipment Drive Belt Tensioner. It felt like a rough idle situation you'd see with a bad PCV valve. That lets the stock tensioner rotate just a little, and takes a lot of tension off the belt. The idle of a car engine is kind of like a human heartbeat: You can tell what shape it's in just by listening. failing belt tensioner accelerates wear on the whole system including the "free wheel/pulley" and major impact on shortening the life of your air con compressor. I'll have a look again and see what I can find. Had new code for EGR. A worn automatic serpentine belt tensioner can cause belt squeal, misalignment and belt chirp, and alterantor bearing damage. Mine has about 76k miles. Rough Idle In 4 High. Engine rattling when accelerating can be a symptom of a problem with this timing belt. Some common items include the serpentine/drive belt, water pump, drive/serpentine belt tensioner, camshaft seals, crankshaft seal, and valve cover gaskets. 0 TS 114kW - R. on most cars, that would include A/C, power steering, the alternator, the water pump, and various smog equipment. The new tensioner (P/N 3945527) is used for all ISC water pump options. Symptoms of a Bad Idle Air Control Valve. Many of the engine s accessories such as the alternator water pump and AC compressor can be belt driven. Pullys appear to be free. The result is a rich fuel condition resulting in a rough idle, excessive fuel consumption and high emissions. It does not harm the engine and can usually be heard only at idle so if yo can live with it, great. I know when my tensioner pulley went, the spring would bounce a lot more because of the bearings being bad. 0 TDI engines. If the engine stalls or the rpm's drop, your idle may be set incorrectly. The Belt should have about 2 - 3 cm movement which allows you to hook it over the alternator pulley and then release the tensioner. Why does my car make a high pitched noise The drive belt is the one that drives power to the engine accessories , when the belt is worn out or damage high pitched engine noise is easily be heard especially the driver. In this case, the 3. #1 – Rough Idling of the Engine. Over time, the friction wears down these grooves, resulting in a loose fit. A 2008 Chevrolet Cobalt 2. Doesn't run bad on it, just not great. Install the water pump belt and tensioner cover. Engine runs rough or misfires. Worse case it seized up and breaks belt. On the "idler wheel/pulley" personally I like the Gates part best but thats me. This can also push the drive belt off the idler pulley resulting in belt travel. Do "not" cut the belt: Avoid such a "short cut", as that can cause the tensioner or where it attaches to be damaged when it springs back violently. On a revisit to the mechanic he noted the timing belt to be off allignment by a notch and this fix greatly improved the vibration; however, I still notice a marked increase in vibration if I ad any load to the engine at idle speed, such as turning on the a/c or blower. (new) or 160 lbs. The issue is the chain tensioner…. A worn serpentine belt can cause various parts to slip as the engine is running. It has a rough idle and shakes a lot. It’s in danger of skipping a tooth – at best, performance suffers. Belts can become glazed on the inside drive surface which can cause them to slip, which produces the loud squeal. By not changing the belt at the same time, the belt slapping started. While there are a variety of reasons your GMC Envoy has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil. • Unstable or too low idle speed, or stalling after first cold start attempt - are taking place, but do not have a universal solution. Also can replace bearings if tensioner part is still good. , plug wires injectors, timing belt, serptine belt, tensioner, fuel filter,temp sensor, cooling fan switch, but as soon. First time poster here Did a search and I think I have the answer to my problem, but let me know what you guys think. For this reason, most V-belts use a randomly-spaced series of notches rather than evenly-spaced, because a random spacing eliminates whine. 6 : Volvo:D6 Series: Failed Idle Roller: frode : 13 : 1 : 11-Sep-16 Reply: frode : 23-Jul-16 : Hi Tim, Volvo have released upgraded tensioner and rollers in metal, you need two rollers and one tensioner for every engine, remember to change the bolts on the tensioner since the new one have longer bolts for attaching the belt covers. Return engine speed to idle (verily. Diagnosis – 1. Install the water pump belt and tensioner cover. Timing belt/chain tensioner damaged ; Possible Solutions. Chains do not a service interval for replacement like a belt does, however if the wrong type of oil filter is used or the oil not changed and level maintained they can wear out and are very expensive to replace about 4 times what a timing cost to replace. Only about 1/4 of an inch, but it isn't running straight on the pulley. A typical timing belt. 0 TS 114kW - R. Nissan will replace it for free. The valve train seems louder since the work was done at the dealer. Check engine light on (DTC P0335 crankshaft position sensor malfunction). Malfunctioning driven pulley on Jackshaft 5. ALWAYS replace the idlers and tensioner when replacing the belt. Now the engine runs rough at idle and I can't seem to get it to hold 650to750 idle without holding the throttle control on the TBI. Symptoms will be rough idle, misfires, poor acceleration, hesitation and stalling. White sulfur smelling exhaust. If the pump catches air bubbles is can start to cause whining noises and vibrations. We really like the ride of the Polaris UTVs. In many newer cars it replaces the numerous v-belts that are usually in place for all the different systems in your car, including the power steering pump, cooling fan, air conditioning compressor, and more. It will surge or "hunt" for the correct idle RPM. At idle, in gear and/or A/C running, it adds just enough reciprocating load to cause the belt tension to bounce slightly making the tensioner to bounce against the metal stop. Belt riding seems to be linked to a belt tensioner failing. If you have a bad or worn out timing belt, the following are symptoms that may occur. Sorry for the long post There is more. If all of those things are in order then have a very close look at the belt. Solution: At high temperature environments, the engine increases the engine revs by 250 rpm to increase the air conditioning performance. Rough idle, reduced power, backfiring, and misfire are all symptoms of valve burn. Found my top idler very rough spinning and lots of lateral play. This one is tightened down once the belt tension is set. When the Audi A4 camshaft adjuster seals and valve cover gaskets leak they typically cause a burning oil smell. And be warned that on interference engines, a broken belt or chain can cause severe engine damage as. 9 DCI Diesel. The 2006 Dodge Dakota has 3 problems reported for rough idle. the risk is that the tensioner will somehow cause the belt to dislodge, probably by seizing. A faulty alternator can fast idle issues; if so, replace it. Check the ground wire going to the trans, they tend to corrode there and can cause rough idle and charge issues. A burnt valve will cause issues with your vehicle’s performance and fuel consumption. Car gets oil changed ever 3,000 miles, ATF 30,000 miles. Symptoms of bad spark plug wires include a rough idle, a noticeable drop in engine performance, and lower gas mileage. Started up and idled around 1000-1500 rpm. The symptoms are as follows: severe vibration whenever the car comes to a stop (it seems to be related to the suddenness of drop in RPM) at idle with the gear engaged in 'D' (~600 RPM). Common causes are defects in the opening or sealing of the intake or exhaust valve, worn or broken piston rings, or a blown head gasket. However, any pulley wobble means it is cocked or has a bad bearing. The problem with the short belt life is listed in Lawn Tractor bulletins #13 and #21. If you notice broken/frayed wires, repair and recheck. #1 – Rough Idling of the Engine. He had the new injector he gave me when I bought it. If the idle stays constant, your idle is set correctly. If you think you have a bad alternator you should either get it checked out for sure or replace it. A faulty alternator can fast idle issues; if so, replace it. It only does it at idle with the A/C on and really goes ape s*^t when you put it in gear. A worn belt can, therefore, begin to slip, which is one of the causes the squeal. If your engine is showing symptoms like these, we recommend you get your car checked by a trusted mechanic, as continual driving with a burnt valve will cause more damage to. The pulley bearings should be ruled out first because loose bearings can also cause such a noise. The bearings on these can start making noise, also. A cam that was a tooth off would cause a rough idle but then so can a dirty throttle body. Worn belts will affect the tension since the belt surface area has worn with use. Power Steering Pump Belt Tensioner. Found out a mouse had been living in the mower over the winter. Remove the drive belt auto-tensioner. No spark on mine was due to a bad CDI (expensive). 0 TDI engines including codes, common faults and issues on the VAG group 2. At idle speed, the result is a rough idle that causes the engine to shake when you’re at a stop. At idle, in gear and/or A/C running, it adds just enough reciprocating load to cause the belt tension to bounce slightly making the tensioner to bounce against the metal stop. Read up on vibration issues here. Welcome to Allpar. The job takes 20 minutes max Part number of kit - GATES ACK060795HD. stroke, will cause low compression. There are a few other things that can cause serpentine belt noise tho so before you replace the belt check the following:-The bearings in the tensioner and idler pulleys can go bad. Started up and idled around 1000-1500 rpm. Sometimes a new belt is not needed. The auto tensioner is way out of range and seems to have a bounce to it. 122k miles. As per sstroudwku's suggestion, I ordered a used but Genuine Nissan Alternator from ebay. This spring loaded pivot based part can wear allowing the belt to "bounce" as it loses and gains. Starting, car starts right up and jumps to 2k rpms or whatever when starting, and when its settling back down sometimes it will just die, otherwise idle will drop extremely low to the point of it not registering on the tach, and then idle back up. when this happens, you will immediately lose all components powered by that belt. Just a tiny movement here can cause that audible clicking. could the timing belt be the cause maybe? my xt has close. A new drive belt is an easy, inexpensive repair, so get it checked out at the first indication of a problem. If they are bad, they should be replaced with a new compressor. * bad running at idle (where head gasket failures typically cause the most trouble) * hissing sound after shut down (could be coolant spraying into the cylinder when the cylinder depressurizes). Since you've got over 200k on the car, might as well change that out I'd say. If the noise is still present after the belt is removed, it might be an issue with the motor mounts or the timing chain/belt. Older neoprene belts are prone to cracks and chipping, so visual inspection is simple. Replacing the "original" belt tensioner is the 1st step to start. Apparently, if it goes bad, the car can stall and won't start again. Try hand cranking the tensioner pulley. Sometimes a new belt is not needed. CARspec now offers walnut shell blasting of the intake valves to help prevent this issue! 2006+ IS250 and GS300 owners are frequently concerned over a rough idle, especially after sustained freeway driving, or a check engine light with codes P0301, P0302, P0303, P0304, P0305, and/or P0306 (misfire codes). Idle smooths out after a few minutes. At idle speed, the result is a rough idle that causes the engine to shake when you’re at a stop. I noticed the serpentine belt on the tensioner pulley was running off slightly on the back side of the pulley. Here are five techniques you can use to solve belt noise problems. If the noise is coming from the tensioner, it is time to replace it. After driving a few miles to work, the idle got a. Next issue was rough idle. Check belt deflection Apply about 22 pounds of pressure to the center of the belt between the camshaft pulleys. If you can get to them I'd try that. Car runs fine other than the rough idle that seems to be coming from the auto tensioner being out of range. However, any pulley wobble means it is cocked or has a bad bearing. Hesitation and slight rough idle? User Name: Replaced the bad belt tensioner. The result is a rich fuel condition resulting in a rough idle, excessive fuel consumption and high emissions. Who is correct?. a defective crimp connector in a belt tensioner wiring plug may lead to increased electrical resistance of that connection. We would recommend replacement of the belt and the tensioner. PO said it was a bad injector on number 2 cylinder. Checked all pullies. Bad spark plugs, bad spark plug wires and a bad distributor cap are other common causes of rough idling. I removed belt quite easily. White sulfur smelling exhaust. This can also push the drive belt off the idler pulley resulting in belt travel. Hesitation and slight rough idle? User Name: Replaced the bad belt tensioner. Many of us have had fault codes pop up on our screen while riding or while trying to start our bike. White sulfur smelling exhaust. And don't forget to test the serpentine belt and belt tensioner/pulley. If the signal appears normal, then check the timing chain/belt for proper alignment. Is the idle bouncing? I could be a bad bearing or ac clutch in the compressor. Will a bad tensioner adjuster create enough slack in the timing belt to cause a rough idle? I recently bought a '98 Outback with 135k miles. (new) or 160 lbs. At worst, changes to engine timing can cause the pistons and valves to collide – such engine damage is extremely serious. It only does it at idle with the A/C on and really goes ape s*^t when you put it in gear. Belt-driven accessories fail. When your serpentine belt is making squealing sounds, it is a good idea to inspect for the cause. For this reason, most V-belts use a randomly-spaced series of notches rather than evenly-spaced, because a random spacing eliminates whine. Switched to 89 midgrade, and she's a totally different truck. Could be a bad motor mount or trans mount. Then I started noticing a belt whine noise. Noticeable hesitation when starting from a stop, engine seemed fine when under load or above 1000 RPM. Replaced Timing belt, timing belt tensioner (loose bearing), and new motor mounts (broken rubber inners). A cam that was a tooth off would cause a rough idle but then so can a dirty throttle body. Common causes are defects in the opening or sealing of the intake or exhaust valve, worn or broken piston rings, or a blown head gasket. this causes the timing chain to flap against the the guide rails eventually breaking them. I might get more requests about idle issues than any other topic. The valve train seems louder since the work was done at the dealer. It runs rough at idle, and surges with power as the rpm increases. Information on repairing your 2001-2004 F150 with the 4. Does anyone know what could be the cause of my hesitation and rough idle issues? I've been reading a couple of threads saying that the throttle position sensor can cause these symptoms. Mass airflow sensor failure. If you vehicle is made after that date most likely you have an camshaft actuator or camshaft actuator solenoid problem. The auto tensioner is way out of range and seems to have a bounce to it. If that happens, all components that derive power from that belt will stop functioning. A bad pulley can cause fraying on the edges of the belt, and in severe cases can even cause it to break. this can be done by releasing tension on the drive belt tensioner and removing the serpentine belt. Rotating one cam sprocket disturbs valve timing relative to the other side of the engine. on most cars, that would include A/C, power steering, the alternator, the water pump, and various smog equipment. If a timing belt jumps, this can quickly take out the IAC. Still get a little rough idle every now and then. First, visually inspect the cam and crank sensors and their harnesses for damage. The 2001-2002 engines require an electronic speed signal input to run properly. The causes might vary, but most idle problems are caused by a mixture issue. Often the valve can get stuck in the open position and cause a rough idle. There could be water on the belt, which isn’t such a big deal, especially if it’s raining at the time. The tensioners job is to keep the right amount of pressure on your Cadillac SRX’s timing belt or chain. As you can see, I've already disengaged the tension on the belt by placing an appropriate socket on the bolt head and lifting the pulley against its springs to release the belt. This WheelZine article tries to list down the possible signs and symptoms of a bad idle air control valve. Engine idle issues can obviously involve a wide range of potential faults, involving ignition, fuel, vacuum and mechanical problems. Lack of power at low rpm. Autozone or Advance Automotive do this for free. The notches in a belt can cause noise. Morning commute to work, stopped at 2nd signal light, noticed that the idle was super rough, thought it was going to stall. This basic repair procedure works for many Craftsman, MTD, Murray, Husqvarna, Toro, Snapper, Troybilt, Ariens and Noma snowblowers. What Is Causing My Car’s Squeaks, Creaks, and Clunks?. Vac leaks will cause a rough idle. Yes, a bad belt or tensioner can be related to a rough idle. The result is a rich fuel condition resulting in a rough idle, excessive fuel consumption and high emissions. 9hrs at $80/hr, $72; Injector cleaner – approx. Check engine light on (DTC P0335 crankshaft position sensor malfunction). The passenger side cam chain tensioner seal is located on the backside of the cylinder head and will drip oil onto the down pipe causing this smell. A faulty EGR is the most widely known culprit but there is another source that can potentially choke your engine, the PAIR(AIV). Apparently belt squeal is a real common issue on these Silverados and there are a ton of online videos that talk about pulley bearings, pulley alignment, belt contamination, brand of belt, etc. The rough idle seems to coincide with the pulsing lights. I have a constant screaming noise coming from the area of the power steering pump and accessory tensioner. Cracked or splitting belts can cause further damage to your AC compressor. The RPM was around 1200 or so and the rough idle lasted about 10 seconds. Not really sure about voltage staying put after warm, honestly never messed with any on these cars. especially in rough road conditions, can cause the clearance between. The system is full of coolant and the belts are properly adjusted. The exhaust sounds louder with the Jetchip in. 1 idler bearing on, again this takes 2 people; one person manuvers the idler while the other slips the bolt into its housing. 2005 Nissan Altima 2. A cam that was a tooth off would cause a rough idle but then so can a dirty throttle body. The grinding sound could be a tensioner pulley for the serpentine belt. A faulty EGR is the most widely known culprit but there is another source that can potentially choke your engine, the PAIR(AIV). 0 TDI engines including codes, common faults and issues on the VAG group 2. Is the idle bouncing? I could be a bad bearing or ac clutch in the compressor. The tensioner pulley has a plastic wheel and technically unserviceable as bearing is welded in but I used a Dremel tool to grind lip off and used Araldite to lock in the new bearing. The air conditioning compressor is driven by a separate belt mounted low on the engine, behind the accessory belt, and has only an auto-tensioner. Engine runs rough or misfires. Apparently, if it goes bad, the car can stall and won't start again. Stop and the idle was rough. 9 harnish lincoln-mercury 35537 01-oct-07 2l1z 3c084 aa 18274703 customer comments customer states right front axle seal is leaking. It could possibly and eventually set a P0300 misfire fault code. Then put a 14mm wrench on the bolt at the bottom of tensioner bolt and crank the bolt clockwise to loosen (it is reverse threaded). So I ignored it. The belt is too loose, so it slips on the pulleys instead of traveling along them. i flushed it a little under 1,000 miles after acquiring the car at around 94000 miles. When the RPM'sdrop and the noise comes, I can see the belt tensioner move back and forth. • Once again note the limited life-time of the timing chain and chain tensioner. Also the idle Rpms are constant. The tensioner is a self-adjusting pulley that maintains pressure on the belt to reduce slipping. Remove the drive belt auto-tensioner. What causes ruf idle and stalling in a 1994 dodge ram 1500 what is voltage of a pulse generator for 1993 dodge ram 1500 what should my oil pressure be on a 1992 dodge ram 1500 5 2 engine what should the cylinder compression be on for a 1991 dodge ram 1500 where is the oil pressure sending unit on a 1990 dodge ram 1500 with 5 9 will low oil level cause check engine light to come on a 1991 dodge. And be warned that on interference engines, a broken belt or chain can cause severe engine damage as. Mass airflow sensor failure. What happens is the bearing overtime in the tensioner starts to fail and causes this issue. Most of the time when a lawn mower won't start the cause is a problem with the gas or the lawn mower carburetor. I have a 2003 chevy impala i started it this morning and it was shaky with a rough idle and flashing check engine light. First thing you need to do is isolate which system is squeaking. Could be a bad motor mount or trans mount. I have no idea how that could cause this issue. OBD II codes indicate misfire on cylinders 1 & 3 and on multiple cylinders. Took off housing cover replaced ignition module, now can’t get the plug on the wire. The tensioner and the belt might need to be replaced. If you vehicle is made after that date most likely you have an camshaft actuator or camshaft actuator solenoid problem. As you can see, I've already disengaged the tension on the belt by placing an appropriate socket on the bolt head and lifting the pulley against its springs to release the belt. 0 TS 114kW - R. If the vacuum system gets a leak, it will cause a shake when idle. Honda had problems with contacts inside the CDI units. Diagnose a belt tensioner Diagnose a belt tensioner. However, any pulley wobble means it is cocked or has a bad bearing. Stop and the idle was rough. Bear in mind that cam phasers are part of the Variable Valve Timing system which is an important component of the 5. I have a 2012 MDX, just shy of 100k miles. I have a 98 S-10 ZR2 with the 4. Over time, the friction wears down these grooves, resulting in a loose fit. failing belt tensioner accelerates wear on the whole system including the "free wheel/pulley" and major impact on shortening the life of your air con compressor. Symptoms of a Bad Idle Air Control Valve. 0 TS 114kW - R. Instead of using a belt that needs periodic replacement like many cars do, the Mini employed a metal timing chain. Doesn't run bad on it, just not great. Auxiliary belt tensioner & idler bearings are starting to squeak so am replacing them but again, only £4-£10 for a bearing is peanuts. It is a more comprehensive test with it removed. had no money to deal with it and buried our heads in the sand about it) and we had 2 different mechanics tell us that, apart from sounding rough and losing power, driving on 3 out of 4 injectors would do no actual. We wrote about something similar on the Prius, being a common cause of the MIL. Failing Belt Pulleys – The belt is pulled along by several pulleys. The squeaking, squealing and grinding noises can certainly get on your nerves, but the potential problems caused by a bad tensioner are far more than just casual annoyances. If they are bad, they should be replaced with a new compressor. LS1 Belt Tensioner Chatter. Never did a leak down. This spring loaded pivot based part can wear allowing the belt to "bounce" as it loses and gains. The other day, it started making a little bit different sound, and I came to the realization that the problem is actually the alternator bearings. This is primarily to make sure that the emission controls are working properly, but a rough idle can cause a malfunction code to be sent to the computer. You can usually get away with replacing them with every other belt change, but they can fail and cause bent valves at inconvenient times; I had an idler fail without warning in the middle of a 500 mile trip. As a owner you can also retrieve these codes as I've shown in the video below. I can deal with and water pump and Opti change, I'm just hoping it's not internal engine. Likewise, an alternator's worn rotor bearings may produce a knocking sound. Ask Your Own GM Question. I used it all over and as far as I can say, the thing works. Car runs fine other than the rough idle that seems to be coming from the auto tensioner being out of range. Also the idle Rpms are constant. A faulty IAC (idle air control) will definitely cause idle issues. If it doesn’t spin spin smoothly or has a rough surface, replace it. A failing belt tensioner can cause a lot of problems in your vehicle. After driving a few miles to work, the idle got a. These codes point the Spyder techs in the right direction to start looking for a problem. So to summarize, I installed a new belt tensioner first and then the belt. Mass airflow sensor failure. Apparently belt squeal is a real common issue on these Silverados and there are a ton of online videos that talk about pulley bearings, pulley alignment, belt contamination, brand of belt, etc. Some of the most common problems from overheating are: • An overheated cylinder head can crush the head gasket and restrict coolant flow to the cylinders. As can be seen the running pattern of the belt differs on the cars with and without Air con. Or the pipe can simply rust off. When i drive it loses power and stutters when i try to accelerate. Auxiliary belt tensioner & idler bearings are starting to squeak so am replacing them but again, only £4-£10 for a bearing is peanuts. yes ur belt can b worn or ur tensioner can b wornwhich can allow the belt to slip which in turn effects the water pump and the alternatorso electrical issues can cause rough idlealso water flow can cause car to go in and out of "limp mode" for overheating. The belt is too loose, so it slips on the pulleys instead of traveling along them. A bad pulley can cause slippage or misalignment. Another symptom of bad or failing drive belt tensioner is failure of the belt driven accessories. Hesitation and slight rough idle? User Name: Replaced the bad belt tensioner. Cause: Failure of a primary or secondary timing chain tensioner. The tensioner pulley is like $20 and the idler is $35 so might as well start with the cheaper one. Failing Belt Pulleys – The belt is pulled along by several pulleys. Check the serpentine belt and make sure that it is properly tensioned. Noticeable hesitation when starting from a stop, engine seemed fine when under load or above 1000 RPM. 2005 Nissan Altima 2. When i drive it loses power and stutters when i try to accelerate. Whether you’ve got a Toro lawn mower, a Briggs and Stratton lawn mower, or one of the other popular brands, the last thing you want once winter finally lifts and spring has sprung is a. Can't tell it's running rough on the highway or off idle. Then spin it and listen for rumbling. I replace the two part and the deck drive belt last much longer. Had new code for EGR. Instead of 16mm for the Chevy, I turned it down to 12mm for the Toyota, and rethreaded the stud portion from 5/8" fine to 7/16" coarse. Some of the most common problems from overheating are: • An overheated cylinder head can crush the head gasket and restrict coolant flow to the cylinders. Balance Shafts. For the do-it-yourself mechanic, Many high-idle problems can be identified and remedied with some patient troubleshooting. This is because the fuel injectors are responsible for putting fuel into the engine. Allow engine to idle, and determine if noise is noticeable. A bad idle-speed control unit can cause the problem; it may need to be replaced. On a revisit to the mechanic he noted the timing belt to be off allignment by a notch and this fix greatly improved the vibration; however, I still notice a marked increase in vibration if I ad any load to the engine at idle speed, such as turning on the a/c or blower. Next issue was rough idle. If ignored long enough, the catalytic converter can be damaged and might need to be replaced. There is not enough oil in the automobile. Oscyjack wrote:all good things to check. If that happens, all components that derive power from that belt will stop functioning. At this point I changed the OXYGEN SENSOR. Do not leave any slack on the tension side of the belt (Figure 8). If this reduces the noise, the cause is excessive clearance, and you’ll need to make the proper adjustments. Engine runs rough or misfires. This can be seen with a flashlight looking up from under the right front wheel well. Ive replaced the tensioner / belt / 2 pulleys and so far so good. To replace the timing chain is not a simple job at the front of the engine. When the a/c is on there's more stress on the tensioner that's why the noise gets louder. Pullys appear to be free. About two weeks ago, I started to notice the engine stumbling a bit when I'd come to a stop. Also replaced the timing belt, camshaft seals and two timing belt pulleys - one with cogs. ) The IAC or Idle Air Control Valve has built up some carbon on the place where it seals. As to the misfire, could it be the timing belt is installed a tooth or two off? Other than those 2 things a rough running engine at idle can be caused by a vacuum leak, low compression, faulty injector spray pattern, etc. The shop would just have to remove the belt again to replace the tensioner. It is a more comprehensive test with it removed. Place the transmission in park or neutral. Yes, a bad belt or tensioner can be related to a rough idle. A special tensioner tool is available if you don't have a short enough socket from your auto parts dealer. The tensioner pulley has a plastic wheel and technically unserviceable as bearing is welded in but I used a Dremel tool to grind lip off and used Araldite to lock in the new bearing. There are a number of reasons why low oil pressure happens, and a car owner would be wise to keep them in mind. If you can't get the belt around the tensioner pulley then your off a tooth and have too much slack in the belt. As the lower bolt for the serpentine belt tensioner broke off due to torquing it down so be careful while doing this. The new tensioner (P/N 3945527) is used for all ISC water pump options. Each belt has its own separate tensioner pulley. My tail lights and front side markers are doing the same thing. Adjust the tensioner to get the belt just right (too tight can also damage an alternator's bearings), or just replace the serpentine belt since it is among the most affordable car parts you. Then spin it and listen for rumbling. However, due to PCM (engine control module) software issues, the increase can happen with the AC switched off or even in cars without AC. Guys, I have a 1997 S10 with a 2. If the idle stays constant, your idle is set correctly. Sound almost like its running on 3 cylinders but it's not that bad. The repair must have taken place within 10 years / 100,000 miles of the vehicle delivery date. Symptoms will be rough idle, misfires, poor acceleration, hesitation and stalling. 6 H6 and now the newer versions of the H4 starting with the 2012 Forester. Starting, car starts right up and jumps to 2k rpms or whatever when starting, and when its settling back down sometimes it will just die, otherwise idle will drop extremely low to the point of it not registering on the tach, and then idle back up. Step 4: Inspect the clutch located at the front of the AC compressor and make sure the clutch rotates freely. It can't hurt to try the Seafoam. Rough idle. Now put the No. On most vehicles, these parts include the alternator, water pump, power steering, air conditioning system, and different exhaust components. The EGR valve if left open at idle will cause a very rough idle as you need as much vacum as you can at idle. He changed the timing belt, drive belts, water pump, pulleys, tensioner and a few hoses, and everything seemed to go off without a hitch. 0 TS 114kW - R. I'll do the old long screw driver to the ear on the water pump and Opti and see if those are what are making the noise and I'll slip the belt off and test all the accessory pulleys and and let you know. I read on the Mazda6 forums that it could be a bad tensioner. Appearance: With the engine off and the belt removed, manually rotate the. I have no oil lose.