4+3 overdrive issues
Drifting
Joined: Feb 2013
Posts: 1,460
Likes: 48
FOURSPEEDVETTE
I think that you are answering the question about clutching to engage the overdrive. I was asking if the black wire is the one that powers the overdrive. In any event being there is only one wire that is in the location we are discussing, it must be the wire. Sorry for the confusion. I read the post about the bypass wire and it answered my question.
thank you and hve a Merry Christmas and a great New Year
I think that you are answering the question about clutching to engage the overdrive. I was asking if the black wire is the one that powers the overdrive. In any event being there is only one wire that is in the location we are discussing, it must be the wire. Sorry for the confusion. I read the post about the bypass wire and it answered my question.
thank you and hve a Merry Christmas and a great New Year
Safety Car
Joined: Oct 2007
Posts: 4,426
Likes: 229
From: Pennsylvania
Not hard to understand how it would make it last longer but at the same time I never bothered on my 86 and I drove it hard. Never had a problem with the overdrive in it and never used the clutch when engaging it. Also when you go to pass someone it downshifts on its own and your not "clutching" for that either which is 100 times more harsh than you engaging it while just cruising along with no real load on it. Again never had a problem. Hard to say if shorting the life of the main clutch is worth any savings on the life of the overdrive in the long run since the overdrive never went out.
You're definitely someone who knew how to drive and operate it, as it was not really designed to need the clutch to operate. Many tried to 'speed shift' the transmission overdrive by accelerating hard through the gears and hitting the overdrive hard. After doing it that way many times, it took tolls on the overdrives and shortened or destroyed it's function. Many owners today don't understand how it was originally designed and they wind up damaging them. So my advice is to always use the clutch as it slows down the shift process and makes the shift very easy on the overdrive unit. I've always done it in this manor and so far I've never had 2 cents worth of problems.
Drifting
Joined: Feb 2013
Posts: 1,460
Likes: 48
You are correct in every thing you said. You're definitely someone who knew how to drive and operate it, as it was not really designed to need the clutch to operate. Many tried to 'speed shift' the transmission overdrive by accelerating hard through the gears and hitting the overdrive hard. After doing it that way many times, it took tolls on the overdrives and shortened or destroyed it's function. Many owners today don't understand how it was originally designed and they wind up damaging them. So my advice is to always use the clutch as it slows down the shift process and makes the shift very easy on the overdrive unit. I've always done it in this manor and so far I've never had 2 cents worth of problems.
You're definitely someone who knew how to drive and operate it, as it was not really designed to need the clutch to operate. Many tried to 'speed shift' the transmission overdrive by accelerating hard through the gears and hitting the overdrive hard. After doing it that way many times, it took tolls on the overdrives and shortened or destroyed it's function. Many owners today don't understand how it was originally designed and they wind up damaging them. So my advice is to always use the clutch as it slows down the shift process and makes the shift very easy on the overdrive unit. I've always done it in this manor and so far I've never had 2 cents worth of problems.I took apart the console, lifted the switch turned on the car and used a test lamp to see if power was getting to the switch. Neither the green or black wire had power. So no power is getting to the switch. My question is I did I do this correctly. I think I did.
So no power to switch. Where to next. Thank you all. And HAPPY NEW YEAR
Melting Slicks
Joined: Jun 1999
Posts: 2,931
Likes: 127
From: Ashland Alabama
So I made a wire to bypass the console switch. Went for a ride and was able to engage the overdrive. I replaced the relay, just took a shot.
I took apart the console, lifted the switch turned on the car and used a test lamp to see if power was getting to the switch. Neither the green or black wire had power. So no power is getting to the switch. My question is I did I do this correctly. I think I did.
So no power to switch. Where to next. Thank you all. And HAPPY NEW YEAR
I took apart the console, lifted the switch turned on the car and used a test lamp to see if power was getting to the switch. Neither the green or black wire had power. So no power is getting to the switch. My question is I did I do this correctly. I think I did.
So no power to switch. Where to next. Thank you all. And HAPPY NEW YEAR
Drifting
Joined: Feb 2013
Posts: 1,460
Likes: 48
With car running ther wires on the extreme ends of the connector both had power. and one of the wires in the relay had power.
Whe n you say test wire C8 on the ECM. you mean use the test lamp to see if it is getting/sending power, correct? Thank you.
Melting Slicks
Joined: Jun 1999
Posts: 2,931
Likes: 127
From: Ashland Alabama
Thank you for the feedback. Just one thing I should have mentioned. I tested for power going into the relay. There is pwer going into the relay.
With car running ther wires on the extreme ends of the connector both had power. and one of the wires in the relay had power.
Whe n you say test wire C8 on the ECM. you mean use the test lamp to see if it is getting/sending power, correct? Thank you.
With car running ther wires on the extreme ends of the connector both had power. and one of the wires in the relay had power.
Whe n you say test wire C8 on the ECM. you mean use the test lamp to see if it is getting/sending power, correct? Thank you.
Melting Slicks
Joined: Jun 1999
Posts: 2,931
Likes: 127
From: Ashland Alabama
Drifting
Joined: Feb 2013
Posts: 1,460
Likes: 48
This is great thank you. Is this n the service manual? I have so much trouble finding stuff in that book. Thanks again
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Melting Slicks
Joined: Jun 1999
Posts: 2,931
Likes: 127
From: Ashland Alabama
The http://vettetop100.com has a ton of sites on it that have good info such howtos and info. That's why I made it all those years ago was to link the sites together to help people find them.
Drifting
Joined: Feb 2013
Posts: 1,460
Likes: 48
Its just a pic I had saved. Ive got alldata from when I mechanic'd years ago, shop manuals, and tons of info Ive snagged up over the years. Been saving online stuff from vettes since 1997 so Ive got a good bit of saved out stuff
The http://vettetop100.com has a ton of sites on it that have good info such howtos and info. That's why I made it all those years ago was to link the sites together to help people find them.
The http://vettetop100.com has a ton of sites on it that have good info such howtos and info. That's why I made it all those years ago was to link the sites together to help people find them.
Drifting
Joined: Feb 2013
Posts: 1,460
Likes: 48
If I ran pwer to the green wire> Am I byoassing the relays and switches, ECM etc. I found out that the gauge fuse was burned out. I replaced it and took the car for a ride. BUT, I forgot to get it over 165 degrees. The overdrive will not go in under 165 correct?
Thank you
Thank you
Melting Slicks
Joined: Jun 1999
Posts: 2,931
Likes: 127
From: Ashland Alabama
If I ran pwer to the green wire> Am I byoassing the relays and switches, ECM etc. I found out that the gauge fuse was burned out. I replaced it and took the car for a ride. BUT, I forgot to get it over 165 degrees. The overdrive will not go in under 165 correct?
Thank you
Thank you
Drifting
Joined: Feb 2013
Posts: 1,460
Likes: 48
Have a good noght and thank you
Drifting
Joined: Feb 2013
Posts: 1,460
Likes: 48
I was afraid that running power to that wire would by pass the first gear lockout. I have come too far to burn up the overdrive like that. I was kind of shocked to see the seat belt light come on, after I replaced the gauge fuse. Really upsets me that the owners manual does not list the overdrive on that fuse. I seem to remember someone saying that there is a temperature requirement befor eth overdrive will work. I will HAVE to drive it tomorrow: lol: and test it.
Have a good noght and thank you
Have a good noght and thank you
So I replaced the fuse and now my seat belt light and door ajar light come on. But, still no power at the green wire for the overdrive. Do the solenoids determine if the green wire gets power? From the diagram that I have it looks like the green wire comes from the OD solenoid?
circuit (902) comes from the relay wire A and goes to first gear switch. wire leave the first gear switch and is black (905). and goes to the manual OD defeat switch. The green wire goes to the over drive solenoid and the overdrive indicator lamp.
When I depress the center console switch. The overdrive light on the cluster should come on, even if the car is in first gear, correct?
Or does it only come on when the OD is in engaging?
Melting Slicks
Joined: Jun 1999
Posts: 2,931
Likes: 127
From: Ashland Alabama
The light only comes on when its in od from what I remember. Just asking for od doesn't make it come on.
The only thing the switch does is ask the ecm to engage overdrive. The ecm is what actually sends the signal to engage overdrive.
The only thing the switch does is ask the ecm to engage overdrive. The ecm is what actually sends the signal to engage overdrive.
Melting Slicks
Joined: Jun 1999
Posts: 2,931
Likes: 127
From: Ashland Alabama
Looking at the diagram you should be able to put 12v to connector F which will turn the od light on and tell the trans to engage overdrive. It wont engage overdrive though unless the pressure switch has its needs met.
Drifting
Joined: Feb 2013
Posts: 1,460
Likes: 48
I had my overdrive working for a couple of days. I actually jumpered out the console switch and the overdrive worked. But, now it is not working. I went to this post because of the diagram. I removed the connector from the relay and turned on the key. I have power at E but no power at C. The fuse is good. The door ajar comes on and I looked to check. The blade connector the goes on the pressure switch is connected but not tight. It fell off once. I put it back on and then shrink wrapped the connector on with electrical tape. Could the fact that this connection is not tight be the problem?
Thank you for your help
Drifting
Joined: Feb 2013
Posts: 1,460
Likes: 48