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.
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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
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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
  • MECHANIC
  • 2,204 POSTS
Blank response
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Thursday, February 3rd, 2011 AT 2:24 PM

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