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I suggest that anyone with this trans who has strange problems with no codes, try a TCM reset.
Thanks dasboot for your suggestions, they were very helpful.
Thanks, Gager
Now, are you saying that the TPS can cause this steady, non- lockup condition at highway speed without setting a code? Should I simply replace the TPS just to be sure? How big a impact on the lockup mode of the trans does the catalytic converter have? And lastly, how good is the "adaptive learning" of the TCM/PCM? If there is a parameter caused by some sensor that leads to a highway speed non-lockup condition, then the problem that causes the sensor to record a out of range condition is corrected, will the computer go back to "good" operation? Does that question make sense?
Your input is greatly appreciated. I'm really guessing now about the problem...
What specifically was it? Was it something about catalytic converter efficiency low, or something like that? Worn out O2 sensors can sometimes mislead the emissions diagnostic system and lead it to think the cat is bad. Depending on the code, I would replace the rear (first) and front (second) O2 sensors first, and see if that clears up the problem. That's less than $300 for 2 or 3 O2 sensors vs $1500 or more for a cat.
On the test drive, I noticed that torque converter lockup (which is the primary problem) was fine up to about 60 - 65 MPH, then tended to unlock. Also, if I accelerated (like to pass), the converter unlocked as expected, BUT it would not relock once normal driving resumed. I could slow down to say 50 MPH, and the converter would relock, and I could slowly reaccelerate to 60 - 65 in lockup. Now, what do you think of this explanation: if the cat is bad, then emissions increase as speed/acceleration increase, up to the point where the emissions get out of range, and the computer signals the torque converter to unlock. Is this how the system works?
So, I'm going to replace the cat. It needs it anyhow. If you have any other suggestions, I'd appreciate them.
will not upshift into highest gear/od button wont work/guages went south no fuel, amperage, oil pressure when turn on headlamps engine temp guage slams all the way to the right, check engine/brake & abs dash lights were on now are not, speedo works. WHAT IT DO? For the love of god i cant finger it out! Any help would be better than a climax., 45mph on the freeway tends to heat things up, besides the engine. Thanks, Unable to climax!
I have replaced the Trottle position sensor and changed the Trans fluid/filter to no avail.
I have no fault codes! This occurs when the engine is hot or cold! The transmission shifts fine otherwise!
Please help
Also, I do not hear the noise if I am accelerating at an "above normal" pace. The noise is not a loud noise, but is aggravating to hear.
Any ideas and/or suggestions??
I noted in an old post of yours that the Throttle Valve cable may have a spring missing or broken? I have brought that up to the mechanic, but he seems to be on a different track... can I check that myself? If so, where do I find it? I am not a mechanis, so need a little help. Thank you!
After reading other posts I wonder if a TCM reset would help with this? Truck has 109500 miles and had a transmission fluid exchange at jiffy lube at 100400 miles. Please advise on possible problems and solutions.
Thanks