2005 Grand Prix GXP Odd clunk when engine is warm and happens over smooth and bumpy roads.

Tiny
JCHIRICO@GMAIL.COM
  • MEMBER
  • 2005 PONTIAC GRAND PRIX
  • 69,000 MILES
I have a 2005 Grand Prix GXP with 69kmi and have an odd issue no one can seem to figure out. I get a clunking noise once an a while when the engine is warm and speed is over 35mph, but it happens on smooth roads also, and does not coincide with bumps like a bad strut mount would. There is no wear in the suspension, steering, etc. I had that checked, and checked myself to be sure. I can feel it in the floor boards when it happens.
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Tuesday, January 10th, 2012 AT 10:33 PM

4 Replies

Tiny
CARADIODOC
  • EXPERT
There is a tool you might be able to borrow or rent from an auto parts store that borrows them called the "Chassis Ear". It is a set of six microphones, a switch box, and headphones. You clip the microphones to suspect points, then drive around while listening with the headphones. You can move the microphones around to zero in on the source of the noise. Be aware that many mechanics have never seen or even heard of this tool. Suspension and alignment mechanics use it to find rattles, squeaks, and other noises.
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Tuesday, January 10th, 2012 AT 10:39 PM
Tiny
JCHIRICO@GMAIL.COM
  • MEMBER
I never knew such a thing existed. I'll see if I can rent one and figure this out. I "think" its coming from the torque converter/flywheel area, so I can start there.
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Tuesday, January 10th, 2012 AT 10:43 PM
Tiny
CARADIODOC
  • EXPERT
There are now two versions of the Chassis Ear. The original one has six microphones that must have wires run into the car where they plug into the receiver box. The new version has two of those and four wireless microphones. That makes setup much faster, but that model costs twice as much. If you want to see what they look like, I can look for the link from Mac Tools. Matco and Cornwell guys have them available too. If you want to buy this setup for yourself, ask at any new car dealership or most independent shops for the names of the tool truck guys and when they stop in. Most visit each shop at least once every other week, often every week. Most also don't mind if you call them at home.
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Tuesday, January 10th, 2012 AT 10:54 PM
Tiny
JCHIRICO@GMAIL.COM
  • MEMBER
Actually a good friend works for Snap-On tools so I can see what their cost would be. Thanks for the info on this. Hopefully I can get my hands on one of these and then I can reply back.
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Tuesday, January 10th, 2012 AT 10:56 PM

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