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Art, I am having the same problem in one of my cars, and I'm sure you're correct that it's the cluster. Could you tell me a bit more so I can try to fix it? Here's the story, and why I'm certain you're correct.
The Story: My girlfriend bought her 89 244 for $400. When we first looked at it the car drove and felt good, but there were tons of "little" issues. It was filthy inside & out, taillight lenses were broken, none of the gauges or lights in the cluster worked, etc. I figured, for $400, the car is a good deal and with tons of spare parts on my shelves and a little elbow grease the car could be respectable.
Why I'm Certain You're Correct: As part of getting things in order I swapped in a spare cluster of unknown origin, to see if the gauges & everything would work. Everything did! Instead of trying to fix the old cluster I just left that one in the car. So, that's one point towards your diagnoses. Also, the problem is 100% repeatable. Getting on it hard and running the engine to higher RPMs will cause the high idle every time, and it never happens at other times. Turning off & on the car will fix the idle right away, always. This, IMO, rules out TPS, IAC, and other possibilities, plus there are no other issues with the car that might be caused by those parts failing.
So, please excuse my long-winded story telling, is there something I can do to get the VSS (vehicle speed signal?) to where it needs to go without buying a new, correct cluster for the car, or is that the only solution?
Thanks as always!
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