MODERATOR HAT ON:
Originally Posted by
tom wu
But I can't believe nobody else has had a similar issue? Anyone? anyone? Bueeller?
This particular quote says it all: YOU are a good example of why I put up the
"New members looking for technical help" post that is referenced my signature below.
We are not standing next to your car, YOU are. ALL we have to go on, is what you type here.
Again, it will shift, then suddenly "pull back" for a few seconds..."
You just told us the car shifts on its own and WE are the problem here? How entitled are you?
You clearly have no "downshift" issue, and you can't, because with a MANUAL, the DRIVER performs all shifting functions, that is why we assumed you had an automatic, as the ECU and TCM do the up and downshifting for you, and when the conductor plate acts up, that is one of the big issues. The above line is nonsense, how can you complain about our help when YOU set us up for confusion? ONE MORE TIME: We are not standing next to your car, YOU ARE.
READ THE POST IN MY SIGLINE. We have no obligation to work harder at this than you do.
BACK TO REGULAR FORUM MEMBER:
You CLEARLY have an engine performance problem, not a transmission problem. Fuel pump, Throttle body, MAF, Throttle PS, PedalPS, CrankPS, CamPS would be my guesses but the last four should throw codes and a CEL. (PS is position sensor).
I vote in this order: Fuel pump, Throttle body, cam or crank sensor. I doubt it's the RCM, but it's always a good idea to send the RCM to DJ if there is any doubt. But first thing I'd do is check fuel pressure when it is acting up. You are now describing what my Ranger did as the fuel pump was dying. A fuel pressure test took five minutes and it was obvious.
The easiest thing to check is fuel pressure, but you must do it when it's acting up. Altho if you test the pressure when the car seems OK, if the pressure is lower than 50psi, you found your problem, 55-59psi is spec. At 40 psi, the car will run, but not well. Below 20-25 or so, it might idle, below 20, it wont even idle.
Beyond that, since you say it 'resets' (my Ranger would develop fuel pressure by turning the key off and starting again, for about 5 miles) I say fuel pump. Of course, I have seen one Throttle body do this as well. That car had 180,000 miles on it. If you turned the key on, and sat there, the TB would make all sorts of goofy sounds, constantly, it had gone insane.