4+3 OD help
Thread Starter
3rd Gear
Joined: Mar 2009
Posts: 3
Likes: 0
4+3 OD help
so I just purchased this corvette in febuarary and have been restoring her she was running really poorly and have fixed several issues including the vacume lines and the biggest bugger a egr exhaust tube over the passenger side valve cover but my latest issue is the OD is turning on in first gear on its own with as well as in 2nd and 3rd the majority of my problems is that if the OD comes on in first it chokes the engine and makes it stall while im driving >.<;; now the people before me installed their own switch for the OD basically they dissconnected the one from the shifter and ran their own switch through the cigarete lighter I have already tested the switch and its good so im confused and not sure what to do from here any help would be appreciated!!! thanks!
sorry about that its a 1986
Ian~
sorry about that its a 1986
Ian~
Last edited by suigen; Mar 18, 2009 at 11:19 PM.
Team Owner
Joined: Jan 2003
Posts: 20,292
Likes: 239
From: Summerland B.C. Canada
Here is info on the 86 OD.
http://members.shaw.ca/agent86/Overdrive-manual.pdf
http://members.shaw.ca/agent86/OverD...Electrical.pdf
If all is working normally, the OD will kick on as soon as the ECM sees what it wants to see, such as coolant temp,RPM, TPS, etc. 1st gear isn't supposed to be over-driven, but it happens to mine occasionally, too.
Before I burned my own ECM PROM, I used to watch the coolant temp and get ready to hit the OD button. Unfortunately, on our 86's you can't do nothing with the OD switch until it reaches the target coolant temp.
Read the info I gave you in the links. It will help you understand the OD system and how to diagnose it's problems.
Good Luck.
http://members.shaw.ca/agent86/Overdrive-manual.pdf
http://members.shaw.ca/agent86/OverD...Electrical.pdf
If all is working normally, the OD will kick on as soon as the ECM sees what it wants to see, such as coolant temp,RPM, TPS, etc. 1st gear isn't supposed to be over-driven, but it happens to mine occasionally, too.
Before I burned my own ECM PROM, I used to watch the coolant temp and get ready to hit the OD button. Unfortunately, on our 86's you can't do nothing with the OD switch until it reaches the target coolant temp.
Read the info I gave you in the links. It will help you understand the OD system and how to diagnose it's problems.
Good Luck.
Thread Starter
3rd Gear
Joined: Mar 2009
Posts: 3
Likes: 0
Here is info on the 86 OD.
http://members.shaw.ca/agent86/Overdrive-manual.pdf
http://members.shaw.ca/agent86/OverD...Electrical.pdf
If all is working normally, the OD will kick on as soon as the ECM sees what it wants to see, such as coolant temp,RPM, TPS, etc. 1st gear isn't supposed to be over-driven, but it happens to mine occasionally, too.
Before I burned my own ECM PROM, I used to watch the coolant temp and get ready to hit the OD button. Unfortunately, on our 86's you can't do nothing with the OD switch until it reaches the target coolant temp.
Read the info I gave you in the links. It will help you understand the OD system and how to diagnose it's problems.
Good Luck.
http://members.shaw.ca/agent86/Overdrive-manual.pdf
http://members.shaw.ca/agent86/OverD...Electrical.pdf
If all is working normally, the OD will kick on as soon as the ECM sees what it wants to see, such as coolant temp,RPM, TPS, etc. 1st gear isn't supposed to be over-driven, but it happens to mine occasionally, too.
Before I burned my own ECM PROM, I used to watch the coolant temp and get ready to hit the OD button. Unfortunately, on our 86's you can't do nothing with the OD switch until it reaches the target coolant temp.
Read the info I gave you in the links. It will help you understand the OD system and how to diagnose it's problems.
Good Luck.
Thread Starter
3rd Gear
Joined: Mar 2009
Posts: 3
Likes: 0
okay this might sound like a stupid question... but where exactly is the overdrive relay ^^: i only have a chilton manual and not finding much info online...
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Team Owner
Joined: Jan 2003
Posts: 20,292
Likes: 239
From: Summerland B.C. Canada
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