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Old 01-06-2009, 12:40 PM   #41 (permalink)
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Join Date: Jun 2008
Location: Northwest Lower Michigan
Posts: 1,006

Red Car - '89 Chevrolet Celebrity CL 4 door
Team Chevy
90 day: 36.47 mpg (US)

Winter Wagon - '89 Pontiac 6000 LE Wagon
90 day: 28.26 mpg (US)
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Originally Posted by Intrigued View Post
Oh! Gotcha. That's not the first time - or the last - that I've misunderstood what a person was meaning. Some GM cars have separate motors running the speedometer and the odometer, so it is quite possible the speedo motor is getting a little voltage happy.

I have a small handfull of those around still, but by now I have no idea whatsover of what they fit, although I do remember that Cadillac owners were a lot more picky than any other GM owners...
Thats probably the most likely cause. Its been quite a few years since Ive torn into one of my clusters, but I do remember the speedo and odo are separately driven.

All my vehicles are off by a little bit on the speedo, but all are dead nuts on the odo. The 92 Trans Sport is the most accurate, maybe 1-2 high at most. The Celeb is usually a few high. As I was coming back home from downstate with the 6000 the other day, I noticed that the speed was pretty close, maybe 1-2 high. But on the way to work this morning, I noticed it was 3-5 high. The instruments being 20 years old Im sure has something to do with it.


Winter daily driver, parked most days right now

Summer daily driver
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