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1999 GMC Yukon engine flush

Tiny
FLHAND
  • MEMBER
  • 1999 GMC YUKON
  • V8
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
My wife had our engine flushed & about 200 miles later the motor had a tapping sound coming from the crank case. I believe it is the crank bearings that spun from the engine flush. I need expert advise.
Thursday, September 3rd, 2009 AT 9:54 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,896 POSTS
The engine flush shouldn't have caused this type of problem. However, one never knows. I need to know something. A bearing will make a knocking sound and not a ticking. A lifter or rocker will tick. Which does it sound more like?
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Monday, October 5th, 2009 AT 11:21 AM

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