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1997 Buick LeSabre RPM Jumping

3 messages,  Last post on Jun 09, 2009 at 6:58 AM

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#1 of 3 1997 Buick LeSabre RPM Jumping by dfrankenfield Jun 08, 2009 (5:19 am)
This problem started about a week ago and i cant seem to figure it out and i havent had much time to really dig into it.   My rpm metter free floats from 0-7000rpms and above, the car itself never stops running at normal rmps, never revs, nothing, but the meter is all over the charts. if i rev the engine, it will take off from where ever it happens to be and begin to read and then fall to normal areas, for instance if i rev the car and its already floated to 4000, it will jump to 6000 cause i reved it, then fall back down to 800 or so for idling. Happens while driving, while idling, anytime the car is on.   Any ideas? My one friend said its probably one or 2 of my sensors that went bad.   Any help would be greatly appreciated...Thank u Replies to this message: imidazol97 (Jun 08, 2009 11:58 am)
#2 of 3 Re: 1997 Buick LeSabre RPM Jumping [dfrankenfield] by imidazol97 Jun 08, 2009 (11:58 am)
Replying to: dfrankenfield (Jun 08, 2009 5:19 am) >My one friend said its probably one or 2 of my sensors that went bad   I thought the RPM gauge got its reading from the PCM (computer). I'd look for a dirty connector but first I'd suspect it's in the actual cluster assembly. I'd look for contacts there that have corroded where the cluster connects to the wiring harness. Bonneville people have some trouble with corrosion there. You might try the vibration method-hitting the cluster to try to break through any corrosion with movement enabling a fresh connection metal-to-metal. And there may be a module that interprets the signals from the PCM that's a part of the cluster. That may be failing. But I'd suspect connections first.
#3 of 3 RE:re:1997 Buick LeSabre RPM Jumping [imidazol97] by dfrankenfield Jun 09, 2009 (6:58 am)
alright, yea i didnt think it was a sensor either cuase i didnt see how that really related to the rpm meter but at this point im lookin at all options haha, thanks for the help!

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