Question about 2002 Pontiac Grand Am

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Rotating clacking noise from top read of engine, does not seem to

A nose developed from the upper rear of engine, changes in tempo as RPM increases, seem to get quieter as engine decelerates. No apparrent miss or roughness, slight decrease in acceleration, however was only drive about 2 miles after on set.
Checked all Pulleys and belt all appear to be ok and tight. no fractures in belt that I can find.

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I'd have to hear the noise, but from your description it sounds like it most likely would be in the 'valve train' somewhere. I recommend taking it to qualified garage to be looked at. A bad lifter or rocker arm and/or spring or especially valve work can get a little complicated unless your familiar with them (special tools, etc.). Good luck!

Posted on Dec 14, 2008

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Theres a strange noise coming from my 99 millenia's motor but seems when i accelerate it the noise goes away but wen idle the cars just clack clack clack even when driving it makes the noise unless you are...


It sounds like you have a valve or rocker issue, I would run an engine cleaner through the engine. I suggest draining 1 quart of oil, pour in the cleaner and run engine for 5 min. Let engine cool and drain the oil. Pretty much another oil change. This will hopefully clean a sticking valve if this is the issue. But I also would check for anything hitting the pulley's or fans that may have came loose. I've seen this a lot. Good Luck. It may take 2 cleanings for the engine, so don't get disappointed.

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At that mileage it could be, and most likely is given your description of the noise. I assume it reduces in volume as you slow down. If you can find a quite piece of road drive up to where the noise is apparent and lightly swerve from left to right. (Don't roll the car!! ) If the noise reduces as you swerve left then its the left bearing. If its when you swerve right that the noise reduces its the right bearing. If its both the only way is to jack the rear up and spin the wheels as fast as you can and listen. If there's a hint of a rumble from it, its that bearing or both. It should be completely quite apart from the slight hiss as the shoes rub on the drum.
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