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Loud knocking sound

1995 Buick LeSabre-There is a loud metallic knocking sound. I took off the serpentine belt to see if one of the pulleys had a bad bearing. It wasn't that. It sounds more like it is in the back and center of the engine, if you are looking at it from the front of the car. It does not increase or decrease with rpms, which makes me think it is not internal. It sounds like a something in a fan.

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Bad oil pump ?


Turn your A/C off, the compressor can make noise if bearings are dry or system is low on compressor oil.
Remove your serpentine belt. Turn pulleys by hand to check for roughness. Bearings in those pulleys routinely go bad.
You may get computer warnings with the following test, but with serpentine belt removed, run engine for 2 or 3 minutes. Do this on a warm engine after serpentine belt is removed. The warm oil will not mask the problem like cold thick oil can. Noise generated means problem is internal.
If this is a stick shift transmission sometimes the clutch bearing can make noise and is a sign that bearing is bad.

May 13, 2013 | Ford Focus Cars & Trucks

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

3 Answers

1995 buick lesabre getting a loud constant noise from alternator could it be that i need a new pulley


You might just need a fan bellt or serpentine belt, get an empty spray bottle mix a small amount of
dish soap and water, spray on belt, then start your engine if the noise stops just replace your belt.,
if it does'nt it could be another pulley or the tensioner pulley, then i would suggest removing the belt
and spin each pulley to determine which one is making the noise. if it turns out to be the alternator, you
will have to replace the whole thing. they don't normally sell just the pulley, and even if you can get one
requires special equipment to pull it off, if needed just replace it and save yourself time and trouble.
plus parts normally come with some kind of warranty. good luck!

Aug 03, 2011 | 1995 Buick LeSabre

1 Answer

I just changed my serpentine belt on my 2002 Buick LeSabre. (The old one split in half). Everything seems to be lined up properly but when I started the car to check the alignment, I heard a loud...


remove the belt and check all the pulleys that the belt drives. sound as if one of the bearings in the pulley is seized making the belt squeal and smoke.

Jul 17, 2011 | 2002 Buick LeSabre

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

Theres a knocking noise we thought it was the tension pulley replaced it replaced serpentine belt replaced alternator the knocking continues its coming from this area of the engine top part


noises are difficult to track but since your's is on top, try this-CAREFULLY use a wooden handle (from a broom, or paint roller extension) and place the end against items on top of the engine-the other end, your ear. Be aware of the moving pulleys and the belt, take your time-you can isolate the noise this way, and plan your next step.

Jan 04, 2011 | 1995 Buick LeSabre

1 Answer

I have a 1997 Buick LeSabre. It has a light knocking . it will knock a couple of times then not at all for a long while! it seems to be coming from around one of the bottom pulleys what could it be?


Tell somebody to rev the motor and check where the problem is from, otherwise remove serpentine belt, if it's a supercharged model remove supercharged belt before, and remove the accessories belt ! tell him to start the motor a short time to see it the knock sound is there or not, if not check each pulley if there's any loose or strange noise while turning them !

Jul 17, 2010 | 1997 Buick LeSabre

1 Answer

93 Buick Lesabre custom 3.8 L with engine knock and stalling


if you can turn the serpentine belt either direction by hand at all you probably need a harmonic balancer..or just look in the passenger wheelwell at the h/balencer and see if the rubber is cracked all the way around.. just fixed one with that issue

Jun 04, 2009 | 1993 Buick LeSabre

2 Answers

Pulley bouncing


take the belt off and check the pully for play

Apr 25, 2009 | 1997 Buick LeSabre

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