I'm assuming you mean a pulley, which is what the belts run on. If so, depending on which pulley the bearings could be bad or if it is the crankshaft pulley (big pulley near the bottom) the rubber could be getting bad.
could be your crank shaft
Can you be a little more specific? Like where the clunk is coming from, and/or what you're doing when it clunks? FriPilot
the rear end (differental)
If the sound is coming from inside the engine, an internal part has failed.If the sound is coming from inside the engine, an internal part has failed.
If the sound lessens as the engine revs up, it could be the harmonic balancer. The rubber around the pulley could be bad. This is quite easy to see from underneath the car.
Im not 100% sure. but i have a 97 Monte Carlo. and i think i have isolated the sound to the gas tank expanding and contracting. it has a plastic gas tank, and the sound sounds similar to a plastic drum/barrel/container clunking from expanding/contracting.
sounds like the right front motor mount .i replaced mine and the clunking sound went away
It sounds like a universal joint to me, it's an easy repair and cheap too.
Buick makes a clunking sound from trans area when accelerating.
If there is a clunking sound when turning a vehicle, the problem might be the ball joints in the front end. The ball joints help to support the A-Frame which helps to keep the wheel on and upright.
Nothing good, if it is coming from inside the engine I can assure you of that. Stick your head underneath and see if the clunking is louder from underneath the engine that on top of it. If it is, it's your big end bearings that connect your piston to the crankshaft about to separate. If you are really, really lucky, it is noisy because you are down to about your last two drops of oil, and throwing in a sumpfull might save em if you have got to it quick enough, but if your oil level is normal, well it was probably time for a new car anyway. Phil
movement of suspension components?