Code 39 and only runs well in cold weather - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-04-2003, 03:48 PM   #1
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Default Code 39 and only runs well in cold weather

Yep 93 bonneville just bought it like 3-4 months ago. I have changed fuel filter, oil, spark plug/wires, MAT sensor, air filter, and cleaned the MAF.

Went to a tranny shop when my car was hesitating, dieing, and lunging and he said that it sounded like my fuel filter after he drove it around a bit. The dealer I bought it from was pushing it as a "Christmas Special" which leads me to now believe that he knew that when it turned warm outside the car would run like crap. It will sometimes, when passing or coming out of city and back onto highway, stay in 3rd gear. When it has been really warm outside it will die while idling and not wanting to accelerate. So I replaced the MAT sensor cause it was giving me that code, I think 23, and it ran better but one the highway it still sticks but only when its warm.

Code 39 means the TCC is messed up. How much does an install usually cost?

Could it be something else? It seems weird it only does it when warm outside.

Thanks
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Old 05-04-2003, 06:06 PM   #2
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That code means that your Torque Converter Clutch is not locking when the computer is commanding it to. (You probably already knew that).

This requires a good diagnostic. I noticed that the resistance of the PWM solenoids (which control the TCC) is supposed to vary with temperature... Don't know if this info helps. Is the TCC the only problem left with the car? Maybe time to take it back to the tranny expert.
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Old 05-04-2003, 07:09 PM   #3
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I just drove my car for 2 hours at highway speeds (65mph), 80-85 degrees fahrenheit outside, and it had no trouble accelerating but when I would slow down quickly or to stop the rpms would quickly drop and either start to die or would die. The MAT sensor fixed half the problem apparently because the car was almost undriveable to begin with in warm weather.

Also before I bought the car the mechanic was supposed to do a thorough inspection of the car about 4 months ago now, which mildly pisses me off. He fixed most of what was wrong with it but apparently didnt bother to read the codes stored in the ecm. The tranny fluid seems okay, not black or stinky, and I havent had any leaks in any of the fluids of the car.

Next weekend I am going to try and change the trans fluid, because everythign else on the car has never been changed I am going to assume the trans fluid hasnt been either, and see if that fixes anything (doubtful), but hey who knows?

Any idea how much it costs to have the TCC diagnosed and changed?

Thanks guy
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Old 05-04-2003, 08:19 PM   #4
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Here is some more info. I can't tell you how much it might cost to fix it because I don't know the problem. Others can chime in here.

http://www.bonnevilleclub.com/forum/...pic.php?t=3647
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Old 05-04-2003, 08:45 PM   #5
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Should I take it into the dealer to diagnose the problem or just try a regular transmission shop? I dont have a "regular" I go to so I am afraid I would get ripped off.
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Old 05-04-2003, 09:49 PM   #6
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I tend to lean towards a transmission expert shop in this case. Usually I would say dealer, but transmissions are one area that I feel the dealer needs improvement.

If you are not in a hurry I would give others a few days to chime in and give their opinions.
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Old 05-04-2003, 10:17 PM   #7
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I've got til next week or so.

The car was initially almost impossible to drive when it was warm due to the transmission and the MAT sensor, which was thinking the air was cold all the time, but once I got the MAT replaced it seemed to run fine and now when I stop it dies and sometimes the OD stops working.

I was thinking if I took it to a dealer they could tell me whether it was the harness, ecm, or the TCC solenoid wereas a transmission shop might find that its just the harness but tell me its the ecm or tcc and I would get ripped. But I dont know, I dont really have a lot of experience with either place.
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Old 05-05-2003, 12:17 AM   #8
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Default bad warm weather

Try the fuel pressure regulator, i had the same problems with two car, my bonnie, and my friends olds. two friends ( a dealer mech, and a priviate shop guy) both told me the same thing about the early 90 regulators "they're crap when when they get older"
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Old 05-05-2003, 01:50 AM   #9
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At least I will be well informed of the problem.

jr Which part of your diagnosis would generally be temperature related?
How much does this sorta thing usually cost, a diagnosis and/or new tcc if ya have any idea?

Thanks for your help guys
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Old 05-05-2003, 10:20 PM   #10
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Any idea?
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