Not a Tranny line....update - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-07-2007, 11:13 AM   #11
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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.
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Old 03-07-2007, 11:24 AM   #12
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Quote:
Originally Posted by BLACK94SSEi
Well unfortunately, this is how im finding out what needs replacement.

I told Boosty that I beleive that the line blew because of the increase in line pressure when I installed the Intense PCM. Im not laying blame, just saying that the line/* were old and couldnt handle it.

By the time im done with this 97, it will practically be a new car. lol
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.
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Old 03-07-2007, 11:40 AM   #13
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Correct...

Tranny lines are not hard from the trans to the Radiator... They have to Flex...

Sometimes they can and will fail with age..

The car is 10 years old, But do have the lines replaced... If its leaking that bad, spend a few $$ and have the car towed to the shop before you damage the trans... If you run low on fluid to the point that the trans is dropping out of gear you are already cooking the friction plates among other internal parts

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Old 03-07-2007, 11:45 AM   #14
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Quote:
Originally Posted by jr's3800
Correct...

Tranny lines are not hard from the trans to the Radiator... They have to Flex...

Sometimes they can and will fail with age..

The car is 10 years old, But do have the lines replaced... If its leaking that bad, spend a few $$ and have the car towed to the shop before you damage the trans... If you run low on fluid to the point that the trans is dropping out of gear you are already cooking the friction plates among other internal parts
This is exactly what I told him. It'* not a pcm fault, it'* not even a beating on the car fault. Stuff breaks..
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Old 03-07-2007, 12:09 PM   #15
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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!!!
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Old 03-07-2007, 03:38 PM   #16
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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
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Old 03-07-2007, 03:44 PM   #17
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This is becoming a mechanical issue. Moved to 92-99.
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Old 03-07-2007, 03:46 PM   #18
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Quote:
Originally Posted by BLACK94SSEi
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
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.
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Old 03-07-2007, 03:50 PM   #19
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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!!!!
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Old 03-07-2007, 04:03 PM   #20
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Quote:
Originally Posted by BLACK94SSEi


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