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

1988 auto

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Old Nov 13, 2012 | 08:14 PM
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Default 1988 auto

Sometimes while cruising at 50-65 in overdrive, the dash light to shift up will pop on until I either get off or get into the gas. I was surprised there was even a bulb in it considering its an automatic. Thoughts?

Last edited by John.87; Nov 13, 2012 at 08:30 PM.
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Old Nov 14, 2012 | 07:31 AM
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That would be annoying, I'm sure there is a way to disconnect it!
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Old Nov 14, 2012 | 07:57 AM
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Originally Posted by John.87
Sometimes while cruising at 50-65 in overdrive, the dash light to shift up will pop on until I either get off or get into the gas. I was surprised there was even a bulb in it considering its an automatic. Thoughts?
From what I know this will light up if you are in a lower gear and going faster than 45mph (from memory). I get this dash light come on when I am cruising through twisty roads driving with the shifter out of Over Drive. Just an idiot light.

In full over drive mode i find that it occasionally lights when going up hill. Since its related to the shifter I think when going up hill it thinks the shifter is not in over drive. I just go into non over drive and then back and the switch goes off.

Glad mine is not the only one doing this occasionally. SO I have a normal C4 right?
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Old Nov 14, 2012 | 08:16 AM
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Here are the shift light controls in the ECM code for the 88 Auto

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Old Nov 14, 2012 | 08:59 AM
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I have never seen mine go on!
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