4+3 OD in and out.....
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
if I am not mistaken, there is still a TV cable on the 4+3. I would check that setting... also, make sure the fluid level is good.
I have no clue if this is indicitive of an imminent failure... I expect any number of our 4+3 experts to chime in and tell me my comments are pointless or right on point!
CentralCoaster and Scorp508 are two of the most knowledgeable 4+3 members out there. I suspect Pete K and CFI-EFI know their way around them, too.
I have no clue if this is indicitive of an imminent failure... I expect any number of our 4+3 experts to chime in and tell me my comments are pointless or right on point!
CentralCoaster and Scorp508 are two of the most knowledgeable 4+3 members out there. I suspect Pete K and CFI-EFI know their way around them, too.
Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
The TV was gone in the '86 model year. I would suggest looking at the wiring of the overdrive relay in the engine bay. It is one of 2 identical looking relays (the other is the FP relay) near the firewall kind of between the distributor and brake booster.
The insulation on these wires is nortorious for shrinking back and exposing the wires. When this happens the motion of the car can sometimes cause wires to short across each other causing the condition you are seeing.
The insulation on these wires is nortorious for shrinking back and exposing the wires. When this happens the motion of the car can sometimes cause wires to short across each other causing the condition you are seeing.
Thread Starter
Racer
Joined: Dec 2005
Posts: 295
Likes: 0
From: Kempner Texas
Don't think ity has a TV cable (not for certain though) and fluid level was my first suspect since the pan is leaking, however it only has about 30 miles on it since filled it last and it isn't leaking that bad, but thanks will see if anyone else has some insight.
Thread Starter
Racer
Joined: Dec 2005
Posts: 295
Likes: 0
From: Kempner Texas
Originally Posted by scorp508
The TV was gone in the '86 model year. I would suggest looking at the wiring of the overdrive relay in the engine bay. It is one of 2 identical looking relays (the other is the FP relay) near the firewall kind of between the distributor and brake booster.
The insulation on these wires is nortorious for shrinking back and exposing the wires. When this happens the motion of the car can sometimes cause wires to short across each other causing the condition you are seeing.
The insulation on these wires is nortorious for shrinking back and exposing the wires. When this happens the motion of the car can sometimes cause wires to short across each other causing the condition you are seeing.
Will check that out, I was just in there re-installing my FP relay yesterday. That may be it.
Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
If the condition started after you replaced the FP relay then I would be highly suspicious of that wiring. We all seem to have to deal with it at some point. Being relatively close to the exhaust manifolds doesn't help it much. Give it a look. 
Thread Starter
Racer
Joined: Dec 2005
Posts: 295
Likes: 0
From: Kempner Texas
Originally Posted by robs87vette
Any ideas where to start looking? my OD when on and cruising will go into and out of OD with even the slightest pedal?
Thanks
Rob
Thanks
Rob
OD works good as long as you keep the throttle steady but the slightest movement causes it to do the in/out thing a couple times, then once you get it up to desired speed it is ok again unless you take your foot up to slow down. If you do and then push the throttle again it does it again.
1. Was wondering if the TPS voltage could be off enough to make it think you are at WOT? (need to check that anyways)
2. Could the Hooker front y-pipe be too close and getting the fluid too hot?
3. A sensor on the OD unit going bad?
4. OD switch in the shifter not adjusted right?
It seems like the OD works good when it stays engaged, so I am inclined to believe it is still ok.
What are your thoughts?
Thanks
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
First of all, is the dash indicator light going on and off with the overdrive during this, or does it just stay on?
This will tell you if the problem is upstream or downstream of the relay.
This will tell you if the problem is upstream or downstream of the relay.
Thread Starter
Racer
Joined: Dec 2005
Posts: 295
Likes: 0
From: Kempner Texas
Originally Posted by CentralCoaster
First of all, is the dash indicator light going on and off with the overdrive during this, or does it just stay on?
This will tell you if the problem is upstream or downstream of the relay.
This will tell you if the problem is upstream or downstream of the relay.
Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
Originally Posted by robs87vette
No since the EPROM was re-burned my OD light in the center console doesn't come on anymore, it used to come on when the OD was switched off and off when the OD was switched on, the OD indictor in instrument panel does come on but didn't pat attention to when it comes on and off