2007 GMC Yukon Rhythmic squeaking from eng comp upon accel

Tiny
BUGBUG17
  • MEMBER
  • 2007 GMC YUKON
  • V8
  • 4WD
  • AUTOMATIC
  • 50,000 MILES
Hi, I have developed a rhythmic squeaking in the engine compartment that starts slowly and then increases in tempo and pitch until about 10 MPH, when it is silent. Braking, AC use do not change it. I don't hear it in reverse. Steering has no effect. Sounds almost like a rubbing noise at <1 MPH. Help!
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Tuesday, April 6th, 2010 AT 10:33 AM

5 Replies

Tiny
SERVICE WRITER
  • EXPERT
Since the noise follows vehicle speed, I would first check the front brake area. A warning sensor may be starting to rub meaning the brake pads are worn out or it may be a dust sheild the is bent in enough to rub on the rotor.

IF you can either have someone outside listening for the general area of the noise source as you pass them or raise the front end in the air and spin the front wheels to try to recreate the noise.
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Wednesday, April 7th, 2010 AT 8:29 PM
Tiny
BUGBUG17
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Hi,

Thanks for the reply. I don't believe it is the brakes or guard as it doesn't happen in reverse and applying the brakes during the sound make no difference. Also, the increase in frequency is far faster than the acceleration rate of the car (i.E, rate wheels are turning).

It seems almost as if there is some sort of pump that is squeaky hat eventually pumps faster and faster and quiets down. Is there something I can lubricate in that area? The sound at very slow speeds seems like rubber against rubber squeaking.

Thanks very much for your help!
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Thursday, April 8th, 2010 AT 1:37 PM
Tiny
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The next thing I would look at bassed on the new info would be in the drive belt area.

Open the hood and listen while someone slightly depresses the accelerator, but remaining in park.

Will the noise happen in this situation?
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Thursday, April 8th, 2010 AT 3:11 PM
Tiny
BUGBUG17
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I have done that too. Only when the wheels are moving, and forward from park to about 5-10 mph does it make the sound. Could it be a boot or sleeve on some part or the suspension or forward drive linkage? Thanks.
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Thursday, April 8th, 2010 AT 3:29 PM
Tiny
SERVICE WRITER
  • EXPERT
I would expect a suspension as a source, but wouldn't rule it out. The next way to check this is with chassis ears. This tool can help narrow it down since it is only happening while moving.
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Friday, April 9th, 2010 AT 8:09 AM

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