converter locking and unlocking while cruising
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Joined: Mar 2003
Posts: 1,146
From: Maryland
converter locking and unlocking while cruising
So when cruising at 50mph (verter locks at about 38) it will unlock then lock back up several times in say a 5 minute ride.
Now at first i thought it was random but it seems to do it when i hit bumps in the road. This makes me think it is a short in a wire.
So what wires control it?
Also just some info, i converted the car to an auto from a m6 and i am running a 97 computer and harness with the 93 interior wiring. So their were several splices i had to make.
Now at first i thought it was random but it seems to do it when i hit bumps in the road. This makes me think it is a short in a wire.
So what wires control it?
Also just some info, i converted the car to an auto from a m6 and i am running a 97 computer and harness with the 93 interior wiring. So their were several splices i had to make.
Registered User
Joined: Jan 2003
Posts: 417
From: Iowa
I had this same problem when I still had the auto in my car, it was about 5 years ago so I don't remember all the exact details, but I'll try to post what I remember. I was running a 3400 Edge converter and it would unlock randomly while at higher speeds, 65-75 Mph. It didn't happen as much around 55-60 Mph. I changed the TCC solenoid and had a friend with a Tech 2 scanner check the PCM while I was driving and could not find any problems related to the transmission.
For the PCM to lock up the TCC it has to have cretin parameters reached, MPH, TPS Voltage, engine coolant temp i think (and some others that I don't remember) need to be obtained before it locks the TCC. Also any pressure to the brake pedal will unlock the TCC, and any engine misfires will unlock the TCC.
In your case I would imagine you had to install the auto trans brake pedal in the car when doing the M6-A4 swap. Make sure the brake pedal switch is installed and adjusted correctly. It may be possible that when your hitting bumps your brake pedal switch is being made if it is not adjusted correctly.
I came across a sticky thread on LStech.com with LS1 cars having a problem with the TCC unlocking on cars with aftermarket cams. From what I remember the crank shaft position sensor can pick up a false misfire due to slight cam surge and cause the TCC to unlock. The fix was to slightly desensitize the parameter in the PCM for engine misfires.
My problem was the false misfires, odd because my cam(CC305)is small, but the car felt and ran great. I had PCMforless change the misfire parameter in the PCM and it fixed the problem. Hope some of this info may help.
For the PCM to lock up the TCC it has to have cretin parameters reached, MPH, TPS Voltage, engine coolant temp i think (and some others that I don't remember) need to be obtained before it locks the TCC. Also any pressure to the brake pedal will unlock the TCC, and any engine misfires will unlock the TCC.
In your case I would imagine you had to install the auto trans brake pedal in the car when doing the M6-A4 swap. Make sure the brake pedal switch is installed and adjusted correctly. It may be possible that when your hitting bumps your brake pedal switch is being made if it is not adjusted correctly.
I came across a sticky thread on LStech.com with LS1 cars having a problem with the TCC unlocking on cars with aftermarket cams. From what I remember the crank shaft position sensor can pick up a false misfire due to slight cam surge and cause the TCC to unlock. The fix was to slightly desensitize the parameter in the PCM for engine misfires.
My problem was the false misfires, odd because my cam(CC305)is small, but the car felt and ran great. I had PCMforless change the misfire parameter in the PCM and it fixed the problem. Hope some of this info may help.
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