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4X4 - Engine surges - RPM gage jumps around.

Tiny
HARLEY74
  • MEMBER
  • 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
Wednesday, December 26th, 2012 AT 1:09 PM

4 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 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
  • 3 POSTS
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
  • MECHANIC
  • 52,797 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
  • 3 POSTS
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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