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2000 Pontiac Grand Prix RPM gauge bouncing

Tiny
ROBERTBROWN31781
  • MEMBER
  • 2000 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 107,000 MILES
When accelerating at a slow rate, my rpm gauge on the dash begins to bounce around 2000 rpms. You can also feel the movement when driving down the road that usually last around 3 to 5 secs. I have taken it to two gm dealers. Replaced spark plugs, spark plug wires, and fuel filter. It still continues to happen.
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Wednesday, August 4th, 2010 AT 10:10 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
It is possible the gauge itself is bad. GM can test the gauge.

If not gauge, the ignition system is generating "noise" that is interfering with tach readout.
This is normally caused by a bad wire(s), but since you had them changed, I would suspect gauge, or possible ignition module.
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Saturday, August 7th, 2010 AT 8:10 AM

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