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2006 Chevy Colorado Engine Rattle/Vibration at Idle

Tiny
KD5TJW
  • MEMBER
  • 2006 CHEVROLET COLORADO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 75,000 MILES
My truck started to have a rattle/vibration at idle. This happens for a one or two second interval at idle, stops for about 30 seconds and repeats. This only happens at idle either in or out of gear. Once I hit the gas the rattle/vibration stops. I replaced the belt, no fix. Then the tensioner, no fix. I opened the hood and listened and it sounds like something is loose. Looked around and everything is fine. I kinda think it is the alternator, since I can initiate the rattle/vibration by lowering the power windows. The RPM's at idle are around 650, which has always been normal. Then the rattle/vibration starts I can see a slight change in RPM's, usually less than 100. Thanks for any suggestions.
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Monday, August 11th, 2008 AT 11:42 AM

2 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Try removing ht edrive belt to see if it stil makes the noise, only run it for a short period of time though.I fnoise is gone, then you know it is a belt driven acessory that is doing it. With belt off, engine off, try spinning all accessories to see if any make noise or feel rough like the bearings are bad
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Monday, August 11th, 2008 AT 2:26 PM
Tiny
MICHAELWBC
  • MEMBER
  • 2 POSTS
I had a very similar rattle on my 05 colorado, drove me absolutely nuts. Sounded like it was coming from the engine compartment. At first I thought it was the guts in the catalytic converter, then I took it to the dealership they had to replace an exhaust mount near the transmission and "reposition" exhaust. This fixed my problem.
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Wednesday, November 12th, 2008 AT 8:54 PM

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