4X4 ENGINE SURGES RPM GAGE JUMPS AROUND ...

  • Tiny
  • Harley74
  • 2000 GMC Jimmy
  • 119,000 miles

4X4 - Engine surges - RPM gage jumps around starting at about 55 mph No codes or check engine lights. What should I check first - I have been told to change transmission fluid and the cylinode. Need your help

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Wednesday, December 26th, 2012 AT 1:09 PM

4 Replies

  • Tiny
  • ASEMaster6371
  • Expert
  • 25,556 posts

How does the motor run?

Forget about the trans, lets see what the actual issue is

Roy

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Wednesday, December 26th, 2012 AT 1:11 PM
  • Tiny
  • Harley74
  • Member

Surges at 55 mph - engine runs ok - no codes - no check engine light started after sitting for about a month

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Wednesday, December 26th, 2012 AT 1:21 PM
  • Tiny
  • ASEMaster6371
  • Expert
  • 25,556 posts

I would think an issue with the tach itself if the motor is running ok.

Check connections at the coil and the back of the cluster

Roy

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Wednesday, December 26th, 2012 AT 1:28 PM
  • Tiny
  • Harley74
  • Member

2000 GMC Jimmy starts and runs OK, except when you might say it surges and lacks power a little. The tack jumps around when this happens.

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Thursday, December 27th, 2012 AT 11:13 PM

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