I dont get your reasoning there. Line Pressure depends on torque converter speed. No? It wouldnt be affected by PCM regardless of which one you had.

Our PCM'* do not increase the actual line pressure, instead we shorten the shift time from about 400ms to 150ms which creates a sharper, crisper shift. The 5 parameters that control shift pressure:

Force Motor Current - Positive
Force Motor Current - Negative
Shift Pressure - Normal
Shift PRessure - PErformance
Max line Pressure

all remain unchanged in your PCM. What line was it that broke? A metal one with fittings should not fail and the rubber ones deteriorate over time and are a commonly replaced item.

This is exactly what I told him. It'* not a pcm fault, it'* not even a beating on the car fault. Stuff breaks..

Ok I stand corrected about the PCM and line pressure.

When line pressure increase via the PCM came up in a convo, it was never mentioned that the PCM didnt increase the pressure, but that it wasnt the cause of the line breaking, so I assumed that the pressure was increased via the PCM.

I learned something today thanks to the knowledgable people on this forum.

I appreciate the help Folks!!!

Chuck just called with an update and told me that he couldnt find any trans fluid leaks but did find a knock sensor code as well as a misfire code that occured about 50 something miles ago.

The miles, sound about right from work to home then to his shop this morning. Im pretty sure that there is a trans fluid leak since I saw the fluid color as well as a small puddle on the ground lastnight.

I did ask Chuck to see if he could take a peek under the radiator on the passenger side since I see a pool of some type of fluid right under the lower radiator hose on the support.

The only question I have at this point is, can a bad knock sensor make my car sputter and skip when its under load around half throttle? Thats the only time I notice the engine skipping and sputtering. Other than that if I drive it under normal take offs and acceleration, its fine and shifts like its suppose to.

The misfire could not be duplicated once the tech 2 was hooked up. ???

Im stumped at the moment :?

This is becoming a mechanical issue. Moved to 92-99.

A faulty knock sensor could be sending fasle knock information to the PCM which will then pull timing and fuel to reduce the perceived detonation. The computer will give back timing based on a kr decay rate (basically as the car recovers and no longer detonates the PCM gives timing back). If the knock sensor was sending a knock, no knock situation then the PCM would be pulling timing, giving timing that may feel like a surge or misfire.

When the sputtering occurs, its very fast. I cant really duplicate its sound in words, but as an attemp to show its rate, each dash represents a break in sound from the SC whine when under half to 3/4 throttle..



- - - - - - - - - - - - - - - -




I know its a bad attempt at that, but I have no other way to demonstrate it.


EDIT: while the car is in Neutral, and I rev the engine, there is no hesitation......or sputtering.

EDIT2: Yet another update. Chuck thinks that the fluid leaking was Coolant from the radiator cover.???? Said he saw some leak down off the splash gaurd in the same area I thought to be trans fluid. ???? WTF????

Anyhow there was three misfires, and upon looking at the coils, found crappy connections and nastiness, even though i cleaned them off with a wire brush and a dremmel at Bills house and put dielectric Grease on the contacts.


Soooooo 3 new coils today, wires to follow at Bills this weekend as well as plugs and everything else I plan on doing. Oye vey!!!!

thats cause there is no load on the engine....reving with no load on the motor is pointless

if you have a sputter under load sounds like fuel or spark