Engine knock

Tiny
BLUCHARTER
  • MEMBER
  • 2002 GMC YUKON
  • V8
  • 2WD
  • AUTOMATIC
  • 247,000 MILES
2002 gmc yukon 5.3 engine knocks when starts 247000 miles on it started at 40000 miles
Sunday, December 12th, 2010 AT 9:10 PM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
These are well knownfor this when cold. The kock usually goes awasy and it sounds like a tapping it is probably piston knock or slap. Have a pro listen to it. It won't hurt anything doing that just aggravating
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Tuesday, December 14th, 2010 AT 11:52 PM

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