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1997 Chevy Tahoe Cold engine knock

Tiny
CAM-MAN
  • MEMBER
  • 1997 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 145,000 MILES
My truck has a knock when I first start it but only when the ambient temp is below about 40 degrees. All summer long, I have no knock.
Sunday, July 19th, 2009 AT 9:10 PM

3 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

what engine oil are you using? Have you checked the oil pressure with a mechanical gauge when cold?
Mark (mhpautos)
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Monday, July 20th, 2009 AT 1:56 AM
Tiny
CAM-MAN
  • MEMBER
  • 3 POSTS
I have not put a mechanical gauge on it, but it's a good idea, and I will do it. I have been using Quakerstate. What are your thoughts on synthetics like Mobile 1? I also heard of 4 others with these same symptoms, and they were told it's a normal amount of piston slap. Any thoughts?
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Wednesday, July 22nd, 2009 AT 3:21 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

The syn oil may start an oil burning issue, the pressure test is the key just now, if that is ok, I would be thinking the piston slap may be the cause.

Mark (mhpautos)
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Wednesday, July 22nd, 2009 AT 5:26 PM

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