Well this one has me confused. I bought my TGP 3 weeks ago and I still haven't managed to solve this problem. When I come to a stop from driving, the car will sometimes die. It seems almost like I am driving a manual and forget to push in the clutch. So far I have replaced the O2 sensor, PCV valve,spark plugs and wires and installed a open air filter. I have checked the sensor data with my Scan tool and everything seems to be within range. I think what might be happening is that the TCC is not unlocking even though the ECM is telling it to. I also sometimes get very harsh shifing from 3rd to 2nd. Between that and the stalling at stops it leads me to believe that the TCC is not unlocking for some reason.
Any help on this would be greatly appriciated!
Thanks,
Joss
I had the same problem and I couldn't find out why until one day I pulled out the battery terminals which looked clean on the out side, when I pulled them out, there was like thoot paste coming out of the battery, so I cleaned it up and it was solved. If this doesn't work try to check the idle rpm sensor at the trottle body.
There is a known problem w/ the eprom tuning of the tgp that causes stall at low speed when stopping. The best cure is to re-chip the computer, the JeffM chips are great at fixing this problem. If you want more go, the top gun is the way to go, but make sure you have a good sound base to start with that has no other problems other than the driveability issue above. This includes the Xover pipe, also
If you just want to fix the drivability issues, the base chip will do that, it is a definate if nothing else, I myself can't put up with a car that is unpredictable, and therefore I chipped mine and am totally satisifed with the drivability now.
http://www.turbograndprix.com/driveability_and_performance_chip.htm
well i can tell you almost 100% that its the TCC locking up and not letting go when its supposed to. Now how do i know it? Yesterday going to work my TCC would work fine until 60 mph then would stay locked so I couldn't/didn't want to exceed 60 so I let the car cool down at work then removed the turbo to intercooler pipe and removed the ecu/tcc pigtail going into the tc and went for a drive. The car drives perfect now, and shifts evenly and smoothly. My car also used cut off when slowing if i didn't do the left foot brake right gas when slowing, I rode all the way home from DC to virginia about 40+ miles and the car didn't cut off once using the normal braking method. I also noticed where the rpms used to be just below 1000 going slow or at idle in drive is now right at 1000. I already purchased a new TCC switch $13 but it keeps raining/sleeting/snow so I haven't been able to put it in yet.
Thank you everyone for the responses. I am pretty sure that is is the tcc. 1trucavalier, im gonna try disabling the tcc. Thanks for the suggestion. Let me know if that new switch solves the problem!
Thanks,
Formula305
Quote from: 1trucavalierI already purchased a new TCC switch $13 but it keeps raining/sleeting/snow so I haven't been able to put it in yet.
I know its not exactly around the corner, but I have a nice heated shop with a lift and would be happy to help you replace that $13 part that takes 4 hours to replace! :wink:
Chris
Just one more war story to add to confusion, my tgp was stalling when i came to stop, very intermitently, sometimes like i killed it with the key, othertimes a drop in idle, then stall or recover. I figured it was a leaking crossover. So I disconnect the O2 sensor, pulled ECM fuse to reset it. It idled much better (less pep on throttle or boost). So i figured it was the known issue of leaking crossover affecting O2 sensor. By the time the crossover came it was having a rough idle, New O2 sensor and crossover didn't fix anything. By now the miss at idle was noticeable and consistent. I hooked inductive timing light
to each of plug wires and found engine misses coincided with missing flashes on two cylinders, they sharred same coil. A new coil fixed all my problems, running good for over a year now (stock chip). maybe is was coil all along, maybe it was the cossover issue then coil went bad.
.
You are correct, Torque Converter Control. I have ruled out the IAC. I replaced it from a car with the same one and it changed nothing. Also, I concidered a bad coil but in addition to it dying at idle it also slams into 2nd from 3rd. It feels just like slaming a manual into gear without a clutch and without matching rpm's. So I doubt it is an ignition problem.
The first thing i replaced when i got my tgp was the ign coils since that was a known problem in ALL GM WITH DIS!
So far i have replaced: coils, wires, plugs, tps, iac, crank sensor, vac mod,02 sensor and the car would cut off when i went down hill and didn't apply gas, stop and go traffic, or abrupt stopping. I would also lean towards replacing your injectors 13yrs of driving, cheap gas, idiot prior owners, and 120K they should be on there way out. Man I love this car :D ! I will never trade this sucka for anything! If my motor goes its 3800sc!
http://www.kichline.com/chuck/fiero/TCC.htm
The TCC is a Torque Convertor Clutch. It consists of a solenoid inside the transmission, and it's controlled via the ECM.
You may want to look into the stoplamp switch. It's connected to the ECM so the ECM knows when you are stopping (so it can unlock the TCC, and do other things like control fuel/spark during decel). I also remember there being a recall for the stoplamp switches a while ago for the TGP. May be something to check out.
Jason
I unplugged the TCC and the car still dies. I also have replaced the stoplamp switch due to brakelights being on all the time. I have one more idea though. It could be that I have a weak electrical system. Power gets low, especailly when hitting the brakes, not enough power for good spark, or computer shuts down from low voltage. Its one more thing to check. Thanks for the suggestions but I think that this may end up only be solved with a Jeff M chip.
Formula305
You are probably right...most likely this will be solved by a TG160 Jeff M chip. His chip fixes some of the idle problems related to the factory chip. This provides a more stable idle.
Jason
ya know I think Chris A should sale me his chip so I don't have to order one. I can just drive down to his shop and pick it up what you guys think? :lol: