infamous 5MT low idle stall

[want-a-fast-svx]

Originally posted by BLKSVX92
I'm curious if it has to do with the trannies that we are swapping

I have an 02 wrx tranny and it happens to me

me too and i've even tried to adjust the idle at the engine with the throttle cable and still no avail...I'm hoping its a ground or something cause it's reallly a problem not knowing when im slowing down for a light if the car is going to stall or not...I feel like im driving my old jeep again, i have to keep feathering the throttle in fear of it stalling...

[want-a-fast-svx]

Originally posted by mbtoloczko


I don't think its due to any sort of clutch drag. Sometimes, the revs decrease so quickly, the rpms pass quickly below 600 rpm, and the ecu can't react quickly enough to bring the revs back up, and the motor just stops spinning. I think it may be partially due to the 13 lb flywheel.

stock flywheel hear and you just described precisely what happens on mine..A sudden drop that the computer doesn't have time to react to..

[BLKSVX92]

i also have the stock flywheel well at least it seems the problem is limited to those with the wrx tranny just bad news for us

[mbtoloczko]

There's really not much difference internally between the WRX tranny and the other Subaru AWD 5MT trannys. The clutch actuation mechanism is different, but I can't see that its causing a problem. I always push the clutch in all the way, and I know its not dragging.

[GreenMarine]

Originally posted by mbtoloczko
After the 5MT swap, my car was stalling occasionally when I would push in the clutch when bringing the car to a stop or pulling into a driveway, etc. I was hoping the ECU would sort itself out and the stalls would cease, but it didn't happen. Then, I was hoping that when I rewired the ECU input to make the car think it was in neutral, that would fix the problem. It hasn't though. I've been looking through the threads here, and it appears that everyone with a 5MT has the same stalling problem. Anyone found a fix?

I've had this problem before... Though I haven't noticed it lately.. But it is there in my car... Ya think it is just the 1995's ???

[mbtoloczko]

Originally posted by GreenMarineSVX


I've had this problem before... Though I haven't noticed it lately.. But it is there in my car... Ya think it is just the 1995's ???

You got me thinking for a minute, but then I rememberd that Mike's car is a '95, and his does not have the idle stall.

[BLKSVX92]

Originally posted by mbtoloczko


You got me thinking for a minute, but then I rememberd that Mike's car is a '95, and his does not have the idle stall.

Don't forget I havea 92 and I am plagued with the problem

[huck369]

I've never had this problem in my 92....always idles fine

[mbtoloczko]

For the last couple days now (basically since I wrote this post), my car has been not been stalling!! Maybe if I start complaining about my worn tires they'll get some new tread on them. :-)

[mohrds]

I think it is a tune up issue. {Puts on Flame suit}

I had that issue on my 92 (auto tranny) all the time until I swapped out the engine. I would put it in neutral and it would occasionally die.

After I swapped out the engine, it never did that again.

Looking at my old engine, some of the vacuum lines at the rear were showing their age and the throttle body and intake runner were filthy even though I cleaned it on a somewhat regular basis.

Just a shot in the dark, but with all the messing around with the physical install, could some of the vacuum lines have gotten flexed enough where the age fatigue produced a tiny crack? That would explain why it mostly happens to cars after a 5 speed swap.

Doug

[mbtoloczko]

Originally posted by mohrds
I think it is a tune up issue. {Puts on Flame suit}

Stop making sense! :-))

[mohrds]

Originally posted by mbtoloczko


Stop making sense! :-))

I can't help myself. I am going to a Sense Makers Support Group to try and stop.

Doug

[want-a-fast-svx]

Originally posted by mohrds
IJust a shot in the dark, but with all the messing around with the physical install, could some of the vacuum lines have gotten flexed enough where the age fatigue produced a tiny crack? That would explain why it mostly happens to cars after a 5 speed swap.

Doug

yes...this is a very likely possibility, i will have to take a hard and long look at the vaccum lines, however this engine only has 50,xxx on it and i just swapped it not to long ago, however a line or two could be loose or have a hole in it. I do remember though when i replaced the engine i replaced every inch of rubber line i saw for this very reason. Hopefully its just a loose vaccum hose...

for those of you comparing flywheel weight, you also need to remember that even though the flywheel you put on may be stock it's still not nearly as heavy (slower to slow down) as the stock torque converter. I think that's the main problem with it.

[Earthworm]

Mine also stalls occasionally with the 5 spd (2002 WRX). I compensate for this by not depressing the clutch until RPM's are already at 600 or so. (Unless I'm downshifting coming out of a corner)