4+3 question
Thread Starter
Racer
Joined: Jul 1999
Posts: 358
Likes: 0
From: Ottawa, Ontario, Canada
4+3 question
After getting my car out of Winter storage, I decided to take the car for a small run to warm everything up and make sure all joints and bearing are OK. The coolant temp got to 230 and the O/D light came on. BUT.....no overdrive. Cpuld this be a faulty relay or a bum O/D unit???? :cry How can I check the relay to see if it's at fault?
Intermediate
Joined: Apr 2002
Posts: 37
Likes: 0
From: commack NY
Re: 4+3 question (ADL)
Check the oil, not the regular 4 speed tranny oil, but the OD unit oil. I just went through a costly OD unit replacement because i didnt think to check it after storing the car.Needless to say, it was leaking...
Good luck with that and hopefully it will be the relay, if though you need a OD unit , the people i got mine from are modifying it up to 88 specs so it wont run as hot as the 86's. I gotta admit , it feels like a different car ;)
Good luck with that and hopefully it will be the relay, if though you need a OD unit , the people i got mine from are modifying it up to 88 specs so it wont run as hot as the 86's. I gotta admit , it feels like a different car ;)
Team Owner
Joined: Mar 2000
Posts: 83,381
Likes: 87
From: Boston, MA
....the people i got mine from are modifying it up to 88 specs so it wont run as hot as the 86's. I gotta admit , it feels like a different car ;)
Race Director
Joined: Apr 2000
Posts: 11,259
Likes: 6
From: dfw TX
Moderatrix
Cruise-In IV Veteran
Re: 4+3 question (ADL)
ooohhh no! Keep us posted, but I'll tell you that a good friend and very knowledgable vette owner told me that if the light turns on but the unit does not actually engage, then it's the unit :( I've had some problems with mine and changing the ATF in the OD unit always helps. When this is the problem though, the whole thing doesn't turn on (neither light nor unit) when it's suposed to. It would turn on later, at any given time.
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Pro
Joined: Jun 2000
Posts: 686
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From: Crystal Lake, IL USA
Re: 4+3 question (ADL)
Well, if the OD light comes on then the ECM and relay are working fine since the light is powered off of the relay. To test the solenoid in the OD apply 12 v to connector F on the ALDL. This applies 12 v directly to the OD solenoid. The OD light should come on and you should hear a thunk under the car. If you hear this, then all the electricals check out. If not, check the electrical connection to the unit. Is it making good contact? Is the wire going into the OD providing 12v when the OD light is on? Maybe after sitting the connector needs a shot of WD40 and some scotchbrite.
If the OD solenoid is working, then next recommend you check fluid level in the OD - stick a finger in the filler opening. Low fluid will keep it from operating. Fluid/filter should be changed every 10K miles anyway.
Good luck with finding something simple...
If the OD solenoid is working, then next recommend you check fluid level in the OD - stick a finger in the filler opening. Low fluid will keep it from operating. Fluid/filter should be changed every 10K miles anyway.
Good luck with finding something simple...