Question about 1994 Buick Park Avenue

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Making loud knocking sound from idle pulley or alternator , while belt is on but spins free while belts off

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Not sure what you mean.....when what spins free?

Posted on Mar 20, 2011

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1 Answer

If idle pulley was replaced and still noise what is it


Well a place to start is pull off the belt and spin the Idler, Tensioner, AC, Alternator, and Power steering, Smog pump (if equipped) pulleys all should spin easy with no noise. Does the sound go away or change when turning on the AC? Also start the car with the belt off to make sure the noise is not coming from the motor. If noise go's away then it has to be one of the items I mentioned above. Cost will be depending on location and type of part gone bad.

Feb 28, 2014 | 1997 Oldsmobile Cutlass Supreme

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Mazda 626 sedan v6 motor After an oil change we started getting a knocking by the belts when its in idle and in all gears All pullies are spining and the belts are snug No tares in the belt that I can see...


Remove the belts and spin the tension pulleys, idler pulley, alternator ect and listen for noise. Check them for play. You should be able to find it that way.

Dec 31, 2013 | Cars & Trucks

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My 2002 Yukon Denali alternator wont spin


Defective alternator , replace and check tensioner , and tensioning of belt .

Jan 22, 2013 | 2002 GMC Yukon Denali

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I have a ford windstar 2000 and it has a loud scraeching sound when push on the gas or start up


It could be a worn belt, but spin all the pulleys by hand (with belt removed) and especially the alternator pulley, to see if you hear or feel any problems with free spinning pulleys. If they all seem good, try a new belt.

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1 Answer

Loud rattling sound top of engine near or below the alternator when idling, goes away if accelerator is pressed


Hello: Remove the serpentine belt, see if the waterpump pulley wobbles/makes noise when you spin it. If thats not it then start the engine, belt still off see if noise is there also while engine is running see if vthe crankshaft pulley wobbles. Also check the A/C compressor pulley (engine off, belt off) spin it by hand and check for noise and wobble. If all the previous is ok then it could be the balance shaft front bearing and or the timing chain.

Oct 18, 2011 | 1998 Buick LeSabre

1 Answer

My 2000 Ford focus was making a grinding noise when driving the power stering went out and I look under the hood and the belt was loose what do I do... O battery light is now on.


sounds like your belt broke. replace with a new belt. battery light is on because the belt is not spinning the alternator. If it busted you should be able to pull it right out. Make sure to check the tensioner pulley, alternator pulley, power steering pump pulley and ac compressor pulley for free play(if you can make it spin with your hand it's good) and make sure that they're not binding or making any grinding noises. If the belt has never been replaced, then most likely it gave out.

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3 Answers

The belts continue to make a loud screeching noises when i drive over 55. Sometimes when the car is idling the belts make noise. Could it be the tension pulley.


it could be the tensioner, water pump, alternator, A/C compressor, power steering, or even a really bad serpentine belt. The only way to be sure is to remove the s-belt and spin-check the pulleys and listen for squeaks or grinding bearings.

Jan 13, 2011 | 1984 Buick LeSabre

1 Answer

I have a 97 ford explorer limited awd v8 and when I was driving it made a loud pop and started making a loud squealing sound. I put a new belt on and it wont start I charge my battery and my belt stops...


Sounds like you have a pulley locked up. Did the belt break? If not, it could have just flowed over the locked pulley without breaking. Take the belt off and spin check all the pulley's. You will find it. Was you running the air compressor?

Dec 27, 2010 | 1997 Ford Explorer AWD

1 Answer

Serpintine belt was replace as was the idler arm. alternator is charging, and noise difference when ac is on or off. But noise is very loud when engine is running. When serpintine belt is off there is no...


With the belt off, try to spin each pulley that spins and see if there is any roughness or flat spots on the bearings that you can detect with your hands.

Usually, the bearings on Alternators or idler pulleys go bad before the a/c because the a/c should have oil in it. However, it could be any of the pulleys that the belt spins on.

It can be a process of elimination of changing parts until the sound goes away, if you can't detect it under free spinning conditions with the belt off.

Dec 19, 2010 | 2008 Jeep Compass

2 Answers

Pulley bouncing


take the belt off and check the pully for play

Apr 25, 2009 | 1997 Buick LeSabre

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