2005 Pontiac Grand Prix Car making weird nose when idleing

Tiny
BACARVER1
  • MEMBER
  • 2005 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 80,000 MILES
I have a 2005 Pontiac Grand Prix with the 3800 V6 Supercharged engine that has a weird knocking noise. It doesn't sound like the engine is knocking though. The interesting thing is that is goes away instantly when you accelerate. If you even barely touch and hold the gas pedal the noise goes away. If you park the car, the noise usually goes away by the time you get the hood popped and can listen for it. If you are driving down the highway and let off the gas you can hear it but it goes away as soon as you accelerate again. Any ideas?
Monday, January 18th, 2010 AT 8:43 PM

1 Reply

Tiny
ERNEST CLARK
  • MECHANIC
  • 1,730 POSTS
As your engine runs, it vibrates. And sometimes something will work its way loose and knock while your engine vibrates.

Check the pulleys and your exhaust system starting at the manifolds. Then check for anything else that may have worked its way loose.
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Friday, January 22nd, 2010 AT 8:28 AM

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