Gas pedal doing nothing
Gas pedal doing nothing Ok, car was starting then dying, plugged in the MAF and all is good. It idles fine, goes on fast idle and comes off but my gas pedal does nothing. Every time I hit the key, the TB does its little thing then when the car runs I hit the gas and get nothing...
I did cut the pedal down and reweld it.... Could that have killed the insides? Thus a dead pedal?
-Matt
I did cut the pedal down and reweld it.... Could that have killed the insides? Thus a dead pedal?
-Matt
Staging Lane
Joined: May 2006
Posts: 63
Likes: 0
not quite sure but you should be more clear.
you must be talking about the peddle by wire from the vettes, in my opinion dump it and get an F-body throttle body,
peddle by wire is a nice adea untill something like that happens at 60mph on the highway at full throttle instead of at idle!
im pretty sure peddle by wire uses some kind of voltage range and i can look it up if this is what you are talking about
you must be talking about the peddle by wire from the vettes, in my opinion dump it and get an F-body throttle body,
peddle by wire is a nice adea untill something like that happens at 60mph on the highway at full throttle instead of at idle!
im pretty sure peddle by wire uses some kind of voltage range and i can look it up if this is what you are talking about
Originally Posted by 67RSCamaroVette
we'rent you having probs with the fly by wire throttle before, where it wouldn't respond, and replaced the module?
I like the TBW set-up... Plus I'd have to change the harness out in order to run the cable TB.
Its consistant in a vette/escalade so why won't it be consistant in my car is the way I look at it.
And yes it is Drive by Wire. Sorry for not being clear.
-Matt
I think you mentioned before when we were talking about it that it does not respond when the motor is not running either. If I turn my key on without starting the motor, the TB moves when I move the pedal. Could it be the pedal or a connection? How is your wiring set up?
Pat
Pat
Joined: Nov 2001
Posts: 1,707
Likes: 33
From: Anderson, Indiana
Short of throwing parts at it until it works, it would be better to find someone or someplace with a scan tool. Plug that into your ALDL and you'll have the answer in about 30 seconds.
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91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
91 Z28 LS2 408CI, LS9 Supercharger, LPE GT7 cam, Yank3000, 3450 raceweight.
Latest numbers: 9.71 ET, 141.42 MPH, 1.40 60' , 610 RWHP Mustang Dyno
www.speartech.com
Launching!
Joined: Dec 2004
Posts: 274
Likes: 4
From: Kansas City, MO
I have the Drive-by-wire setup and it is as good or better than a cable, plus one gets instant cruise control by hooking up the stalk switch and brake pedal.
I had to cut my pedal as well and welded it also so I don't think that is the issue. Check all the easy stuff first like connections, fuses, and wiring. Also which throttle body do you have? The Corvette throttle body is on the drivers side and the trucks throttle body is on the passenger side and the two wires going to the throttle body servo are reversed for the truck as compared to the Corvette. To clarify, if your harness is wired for the Corvette and you plug it up to a throttle body for a truck the motor will try and drive the wrong direction closed instead of open. Yellow and brown wire on the throttle body servo.
So check all connections to the pedal, TAC box, and verify pins to the PCM.
If the problem can not be found then you need to put a scan tool on to help diagnose the issue.
I hope this helps.
I had to cut my pedal as well and welded it also so I don't think that is the issue. Check all the easy stuff first like connections, fuses, and wiring. Also which throttle body do you have? The Corvette throttle body is on the drivers side and the trucks throttle body is on the passenger side and the two wires going to the throttle body servo are reversed for the truck as compared to the Corvette. To clarify, if your harness is wired for the Corvette and you plug it up to a throttle body for a truck the motor will try and drive the wrong direction closed instead of open. Yellow and brown wire on the throttle body servo.
So check all connections to the pedal, TAC box, and verify pins to the PCM.
If the problem can not be found then you need to put a scan tool on to help diagnose the issue.
I hope this helps.
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Yea I'm gonna give Jesse a call. I get no check engine light either(pulled it and the light works). The car fires instantly and will idle perfectly till I shut it off.
It was weird how it would fire then shut off without the MAF plugged in though... Any more suggestions in the mean time would be appreciated.
-Matt
It was weird how it would fire then shut off without the MAF plugged in though... Any more suggestions in the mean time would be appreciated.
-Matt
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Joined: Dec 2004
Posts: 274
Likes: 4
From: Kansas City, MO
Again go over the engine harness and double check all connectors.
My 1986 El Camino SES light was reverse logic with a factory car side logic box that I had to elliminate and then wire the SES light directly to the PCM so it would work correctly. Check yours system to see if that is the same reason for the SES light not working.
Questions:
What type of throttle body do you have Corvette or Truck?
What type of engine harness and computer do you have Truck or Corvette?
I would check all wiring to the TAC box and PCM and also the pedal to the TAC box.
You could swap the brown and yellow wires on the throttle body servo to see it that is the issue. You see the Corvette servo is on the drivers side and so rotates one direction where the truck is on the passenger side and rotates the opposite direction as compared to the Corvette throttle body. The direction is dictated by the polarity of the brown and yellow wires.
I initially had a truck throttle body wired in and I swapped it out for the Corvette throttle body so I had to reverse the brown and yellow wires to make it work.
If the wires are crossed then the servo will try and drive more closed and be stopped mechanically.
My 1986 El Camino SES light was reverse logic with a factory car side logic box that I had to elliminate and then wire the SES light directly to the PCM so it would work correctly. Check yours system to see if that is the same reason for the SES light not working.
Questions:
What type of throttle body do you have Corvette or Truck?
What type of engine harness and computer do you have Truck or Corvette?
I would check all wiring to the TAC box and PCM and also the pedal to the TAC box.
You could swap the brown and yellow wires on the throttle body servo to see it that is the issue. You see the Corvette servo is on the drivers side and so rotates one direction where the truck is on the passenger side and rotates the opposite direction as compared to the Corvette throttle body. The direction is dictated by the polarity of the brown and yellow wires.
I initially had a truck throttle body wired in and I swapped it out for the Corvette throttle body so I had to reverse the brown and yellow wires to make it work.
If the wires are crossed then the servo will try and drive more closed and be stopped mechanically.
Originally Posted by jdperk-86elco
Again go over the engine harness and double check all connectors.
My 1986 El Camino SES light was reverse logic with a factory car side logic box that I had to elliminate and then wire the SES light directly to the PCM so it would work correctly. Check yours system to see if that is the same reason for the SES light not working.
Questions:
What type of throttle body do you have Corvette or Truck?
What type of engine harness and computer do you have Truck or Corvette?
I would check all wiring to the TAC box and PCM and also the pedal to the TAC box.
You could swap the brown and yellow wires on the throttle body servo to see it that is the issue. You see the Corvette servo is on the drivers side and so rotates one direction where the truck is on the passenger side and rotates the opposite direction as compared to the Corvette throttle body. The direction is dictated by the polarity of the brown and yellow wires.
I initially had a truck throttle body wired in and I swapped it out for the Corvette throttle body so I had to reverse the brown and yellow wires to make it work.
If the wires are crossed then the servo will try and drive more closed and be stopped mechanically.
My 1986 El Camino SES light was reverse logic with a factory car side logic box that I had to elliminate and then wire the SES light directly to the PCM so it would work correctly. Check yours system to see if that is the same reason for the SES light not working.
Questions:
What type of throttle body do you have Corvette or Truck?
What type of engine harness and computer do you have Truck or Corvette?
I would check all wiring to the TAC box and PCM and also the pedal to the TAC box.
You could swap the brown and yellow wires on the throttle body servo to see it that is the issue. You see the Corvette servo is on the drivers side and so rotates one direction where the truck is on the passenger side and rotates the opposite direction as compared to the Corvette throttle body. The direction is dictated by the polarity of the brown and yellow wires.
I initially had a truck throttle body wired in and I swapped it out for the Corvette throttle body so I had to reverse the brown and yellow wires to make it work.
If the wires are crossed then the servo will try and drive more closed and be stopped mechanically.
The TB is the truck TB
Harness is a truck harness aswell everything came as one unit. No mix matching.
Computers are trucks(one came with the engine, I bought another. The TAC box.... could however be a corvette box or no?
-Matt
Launching!
Joined: Dec 2004
Posts: 274
Likes: 4
From: Kansas City, MO
I would suggest give SpearTech a call as John is an expert on the drive-by-wire systems. He should be able to tell you if the truck and Corvette TAC box are interchangeable.
I guess it is possible that your welder took out the pedal but I doubt it since it is only a potentiometer to tell the TAC box its position where the TAC box controls the servo.
I guess it is possible that your welder took out the pedal but I doubt it since it is only a potentiometer to tell the TAC box its position where the TAC box controls the servo.
