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

another 4+3 od question

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Old Apr 25, 2007 | 11:43 AM
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From: Lewisvlle NC
Default another 4+3 od question

My 88 4+3 will not come out of od by pushing the button. When I put it into first gear it does automatically come out of od. When I kick it, it comes out of od and works normally and shifts back into od when I back off, as it should. Fluids are normal. Wiring looks good and plug ins are tight. Any ideas ? Thanks in advance.
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Old Apr 25, 2007 | 12:33 PM
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Sounds like it could be a bad switch.
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Old Apr 25, 2007 | 01:15 PM
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Originally Posted by bills1985corvette
Sounds like it could be a bad switch.
Or a bad/corroded relay. I'm sure Central Coaster will weigh in.
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Old Apr 25, 2007 | 03:35 PM
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http://members.shaw.ca/agent86/OD%20Switch.pdf
http://members.shaw.ca/agent86/Overd...iagnostics.pdf
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Old Apr 25, 2007 | 08:11 PM
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From: Lewisvlle NC
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Thanks Agent 86
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Old Apr 25, 2007 | 10:37 PM
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Clearly the computer has control over it. So the relay works, and the connector at it works.

The shifter switch sends a signal to the ECM, not the relay. That circuit is bad. Most likely on the shifter itself. You have to pull the center console plate to get to it, it's on the side of the shifter below the leather boot.

If the switch is bad, it's cheap. I forget the source though.
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Old Apr 26, 2007 | 11:41 AM
  #7  
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From: Lewisvlle NC
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Originally Posted by CentralCoaster
Clearly the computer has control over it. So the relay works, and the connector at it works.

The shifter switch sends a signal to the ECM, not the relay. That circuit is bad. Most likely on the shifter itself. You have to pull the center console plate to get to it, it's on the side of the shifter below the leather boot.

If the switch is bad, it's cheap. I forget the source though.
Thanks,between you and agent 86, Ithink I can do this !
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Old Apr 26, 2007 | 04:16 PM
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When you go to take the shift **** off and the switch out, be sure to lay a cloth around the shift rod so that any tiny parts (jumpimg springs) cannot fall into the shift linkage tunnel. Otherwise, it is real hard to retrieve them. Don't ask how I know.
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