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

4+3 help

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Old Aug 31, 2011 | 08:33 PM
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Default 4+3 help

I have a 4+3, Overdrive only works when car is cold until @155F and then its gone? changed OD relay, still the same! Any Ideas anyone?

Thanks....
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Old Sep 1, 2011 | 09:44 AM
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Does the OD light stay on while you loose OD ?
Does the switch on shifter turn the OD light on and off ?
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Old Sep 1, 2011 | 09:00 PM
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My OD light goes off and if im in OD when the temp hits 155f it shifts out of OD. Any Ideas whats happing?
Thanks for you help.
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Old Sep 1, 2011 | 09:02 PM
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Sorry. My button works when the car is under 155f. I can shift in and out of OD with no problems until it reaches that temp.
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Old Sep 2, 2011 | 08:58 AM
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For the 87 and 88 OD units, they should not function until coolant temp reaches 122 degrees F. Have you checked the coolant temp to make sure the coolant is the same temp as what is displayed on the digital readout?

You might also check for low fluid. When was the last time you did a fluid and filter change? Another possibility is that the OD solenoid is not working properly.
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Old Sep 3, 2011 | 09:05 AM
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Originally Posted by markf726
My OD light goes off and if im in OD when the temp hits 155f it shifts out of OD. Any Ideas whats happing?
Thanks for you help.
First thought that comes to mind is the ECM goes closed loop, then sees something it's not happy with and shuts off OD.
Does the SES light come on ?
Are there any stored codes ?
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