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RPM gauge

Tiny
MELANIEV
  • MEMBER
  • 2008 GMC SIERRA
  • V8
  • 2WD
  • AUTOMATIC
  • 95,000 MILES
What does it mean when the RPM gauge moves back and forth while driving. There is no noticable sounds in engine while this is happening. Engine sounds fine.
Wednesday, February 2nd, 2011 AT 8:19 PM

3 Replies

Tiny
BILLYMAC
  • MECHANIC
  • 2,204 POSTS
This could mean a couple things. Either you have a eng misfire which is doubtful as your onboard computer would set a misfire code.

The other possibility depending on where you live could be ice on the road. If no ice where you are could be a prob in the ignition system causing an inaccurate tach reading. And the final possibility is simply a defective tach guage.
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Wednesday, February 2nd, 2011 AT 8:52 PM
Tiny
MELANIEV
  • MEMBER
  • 2 POSTS
How would I know if there was a problem in the ignition system?
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Wednesday, February 2nd, 2011 AT 9:07 PM
Tiny
BILLYMAC
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Blank response
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Thursday, February 3rd, 2011 AT 2:24 PM

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