Th400 idle surge
Th400 idle surge What's up everybody, I need help. I have had a th400 in my car for ever and from day one the idle on occasions will idle up and idle down to the point of almost dying. I have been to a couple know tuning shops in my area and neither of them could eliminate the idle issue. So my question is am i stuck with it or can it be taken care of. I can't handle it anymore it makes me not want to drive it. Thanks for any advice i can get.
What's up everybody, I need help. I have had a th400 in my car for ever and from day one the idle on occasions will idle up and idle down to the point of almost dying. I have been to a couple know tuning shops in my area and neither of them could eliminate the idle issue. So my question is am i stuck with it or can it be taken care of. I can't handle it anymore it makes me not want to drive it. Thanks for any advice i can get.
I don't have either, i have a 8in converter with a 4500 stall and a decent cam. It's a 408 N/A pump gas car with a/c.
The car is full weight the only thing missing is the spare tire. So it can be a tuning issue?? I was told it was cause by the th400 and the car was searching for a single. Please any help.
The car is full weight the only thing missing is the spare tire. So it can be a tuning issue?? I was told it was cause by the th400 and the car was searching for a single. Please any help.
Last edited by nitto99; Apr 27, 2018 at 07:47 AM.
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There are tables in the tuning that reference a park/neutral signal and changes timing and spark. It's not just a switch to prevent you from starting it in gear.
I guess it could be tuned around.
I'm assuming you meant to say that the tuner says the computer is looking for a signal? Not single.
So you really need to find out what signal it's looking for.
Was it a stock automatic car? Does it have a stock shifter?
The only signal that the PCM needs to see to idle properly is the VSS. Everything else can be tuned around. The park/neutral signal would help. But there is no other transmission signal that needs to be present for the car to idle properly. So your tuner either doesn't know how to tune it properly or it's missing something that you don't know about.
I still don't understand why you can't post exactly what the tuner says the PCM is looking for.
That makes me think he doesn't know, or you forgot.
I guess it could be tuned around.
I'm assuming you meant to say that the tuner says the computer is looking for a signal? Not single.
So you really need to find out what signal it's looking for.
Was it a stock automatic car? Does it have a stock shifter?
The only signal that the PCM needs to see to idle properly is the VSS. Everything else can be tuned around. The park/neutral signal would help. But there is no other transmission signal that needs to be present for the car to idle properly. So your tuner either doesn't know how to tune it properly or it's missing something that you don't know about.
I still don't understand why you can't post exactly what the tuner says the PCM is looking for.
That makes me think he doesn't know, or you forgot.
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Verdad Gallardo The only info the tuner said was it's gonna idle like that cause the th400 is searching for a signal. Never explained what signal. It was a automatic before and the shifter is a cheetah.