1985 4+3 with overdrive problem.
Thread Starter
Pro
Joined: Mar 1999
Posts: 678
Likes: 0
From: Oslo, Norway
1985 4+3 with overdrive problem.
I have an 85 4+3.
Had a successfull overhaul of the gearbox. Everything worked nicely. Overdrive worked great when pushing the OD switch.
Suddenly it was not possible to enable the OD with the switch. No overdrive light showed.
Took out the relay and put 12V at the A terminal at the relay contact and the OD light came on.
Took a test drive and nothing worked. Then suddenly everything worked all right.
Assume that the connection from the relay to the OD solenoid and light is alright.
Are there any common fault with for ex OD switch ( I have the switch on the console). It was not recommended to ohm the in the direction of the ECM so do not know if there is bad connection.
Will be glad for any comment or recommendation.
This happened the first time 3 years ago.
Had a successfull overhaul of the gearbox. Everything worked nicely. Overdrive worked great when pushing the OD switch.
Suddenly it was not possible to enable the OD with the switch. No overdrive light showed.
Took out the relay and put 12V at the A terminal at the relay contact and the OD light came on.
Took a test drive and nothing worked. Then suddenly everything worked all right.
Assume that the connection from the relay to the OD solenoid and light is alright.
Are there any common fault with for ex OD switch ( I have the switch on the console). It was not recommended to ohm the in the direction of the ECM so do not know if there is bad connection.
Will be glad for any comment or recommendation.
This happened the first time 3 years ago.
Race Director
Joined: Apr 2003
Posts: 17,698
Likes: 1,667
From: moraga ca
Sounds like you might have a bad or intermittant switch. Tilt the back of the console up and remove the connector to the switch. Check it with an ohmmeter. You should find it working intermittantly. Maybe spraying contact cleaner in the thing will work. Good luck.
Thread Starter
Pro
Joined: Mar 1999
Posts: 678
Likes: 0
From: Oslo, Norway
Thanks for the info. Did not think thatthe switch was bad as there are just small currents through it.
Where can I buy an early 1985 console Overdrive switch. Ecklers does not seem to have it and the same with Corvette central.
I would very much appriciate an answer where to buy it.
Where can I buy an early 1985 console Overdrive switch. Ecklers does not seem to have it and the same with Corvette central.
I would very much appriciate an answer where to buy it.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Advanced
Joined: Jul 2009
Posts: 59
Likes: 0
From: virginia beach va
i need some help with this as well. i had my overdrive rebuilt and it doesn't work properly. nothing happens when you push the button on the shifter. but i noticed while cruising on the hwy, all of a sudden the car drops into overdrive. the funny thing is, i could deactivate it by pressing the button on the shifter. but if i press it again to engage it, nothing happens. i did notice the temps were over 200 degrees. anyone close to virginia beach that can help me out?
