C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Spedometer jumping after tuning

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Old May 2, 2005 | 02:01 PM
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Default Spedometer jumping after tuning

I have a '96 with LT1-Edit. Spedometer is adjusted for slightly different sized tires and 3.73 gears. For some reason, when I'm going very slow 1-2 mph (usually just before stopping or initially starting to move), the speedo will jump from 1 to any number between 1 and 200 (literally) and then go back to the correct speed. For a while, I just assumed it was a speed sensor going bad, but I recently replaced it and I'm still having the problem.

Any thoughts on this? It's more annoying than anything, but I imagine I'm adding miles to the odometer when I'm doing 200 virtual MPH.

Thanks!
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Old May 4, 2005 | 02:00 PM
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ttt
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Old May 5, 2005 | 04:51 PM
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Default

mine did this too. unfortunately, i never noticed if it did it prior to any tuning. however, when i switched to an OBD-I ecm, it stopped doing it entirely.

-michael
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