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1998 GMC Jimmy crazy tachometer

Tiny
PEARCE0947
  • MEMBER
  • 1998 GMC JIMMY
Engine Performance problem
1998 GMC Jimmy 6 cyl Four Wheel Drive Automatic

For weeks now my tach has been jumping around like crazy, especially at start up and at times while driving. Sometimes it buries it self and wants to stall, had done complete tune up including cam and crank sensors which I was told to be the problem. Well it still acking up, what I had noticed is when I tighten up one of the vaccum hoses that come from the same area as the cam sensor(rear of dist.), It seems to settle down. Maybe a bad connection or bad wire.
HELP!
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Saturday, March 7th, 2009 AT 9:37 PM

2 Replies

Tiny
91GTA
  • MEMBER
  • 3 POSTS
I have the same problem with my 03 Jimmy; I cant even take it down the highway with out the tach needle and engine reving oddly.

I plugged in my obd2 scanner and it says my crank sensor was having a problem; I pulled out my old sensor and noticed wear marks on it. I put in a new sensor and deleted the trouble code and the problem is still persisting.

Any info? Ive taken my Jimmy to 3 mechanics and not one of them has figuered out the problem.
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Wednesday, March 18th, 2009 AT 6:30 PM
Tiny
PEARCE0947
  • MEMBER
  • 3 POSTS
Yes, it seem to stop after I repaired the wiring on cam sensor plug
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Wednesday, March 18th, 2009 AT 9:41 PM

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