REAmemiya_fan

So in order to take care of the trans vibrations I've been having I am replacing every part of the mounts and support assembly. So far so good, but one thing has me thinking... Why when the engine is cold will my idle act lumpy, but be normal with the clutch depressed? I'm beginning to wonder if something is up with the clutch/pressure plate assembly. It shifts like a dream, but I just have a gut feeling something is up inside there... Any thoughts on it?

I'm going to attempt to give it some beans and go through the rpm range after everything is fully swapped in and my fluid is changed before I unbolt the trans from the engine, so until then, please help me speculate

K-Tune

iTrader: (26)

If idle changes when clutch pedal is pressed....could be a thrust bearing issue.

Landon303

iTrader: (25)

there's a switch at the top of the clutch which is struck when your foot is OFF the clutch, which is an input into the ECU. I think it's that, & nothing mechanical.

j9fd3s

iTrader: (3)

+1

lastphaseofthis

iTrader: (8)

Had this issue with my GSL-SE. hot or cold, i had two different idle's, one hunting, one solid. i believe the ecu changes the idle"load" based on this input, i just jumped it off, so that it thinks the clutch is always in, my starter signal wire already bypass'd it anyways... it also solved the mystery of my hard starts, the ECU doesnt currently know when i am strating or not.

Furb

iTrader: (2)

press the switch manually, without pressing the clutch pedal and see if it changes..

REAmemiya_fan

I'll have to try that in the morning before school. So say that works, where should I go from there? I have the full '89 FSM on my iPad for easy access so if that helps give an answer easier then good.

REAmemiya_fan

You guys were right, its the clutch sensor thing-a-mabob. What's the next course of action I should do? I suck with electrical

jerd_hambone

Replace it? Haha

Furb

iTrader: (2)

Replacing it wont help, the switch actually works..

The problem is in the ecu (NO, this does not mean you have to get another ecu!)
It been a long time for me to have worked with a stock FC, so i dont know for sure. But i think you might want to start with checking the TPS, and your cold-start accessories