HELP, Irregular CEL and RPM drop.

[insanewayne]

Ok, 91 TSi AWD. Car wouldn't start, it was the caps. Got them replaced, they had leaked on the board, lifted a traces, my buddy repaired the trace with a wire and installed the new caps and cleaned the board.

Starts everytime, so that problem is fixed. Before when it wouldn't start, it would turn over, sputter a few times. Then I would turn the key to the off position, wait for the Relay to click off, then the second relay aruond 8 -10 seconds later. Then it would usually fire, then I guess it got bad enough that I just wouldn't fire no matter what I did.

Ok, so now randomly, I'll be going down the road and when I let the throttle drop, it will sometime drop way down to like 500 rpm, the CEL will come on, and during this time I can still rev the engine, but it sounds like its running on 2-3 cylinders (only way I can describe it...like an airy bogging.) I can give it throttle, it struggles, then once it hits like 2-2500 rpms, the CEL goes away and it returns to normal.

No patterns noticed, completely random.

HELP!!!


Thanks,

Wayne

 

[MNGSX]

http://www.dsm.org/how-tos/tttt/tttt3.html

Follow this guide.

 

[insanewayne]

Thanks man, but I don't think my problem fall into those categories, I know all about idle surge etc...

Thanks,

Wayne

 

[huafist]

Random CELs and misfires are signs of leakage damage. Your ECU is not 100% repaired.

 

[insanewayne]

Uhhg...that's what I was afraid of...

 

[huafist]

Uhhg...that's what I was afraid of...

If it helps any, it's usually the ground traces on the bottom that cause the random CELs.

 

[steve]

I'd suggest reading the code to see what the ECU thinks is wrong before doing anything else.
It might still be a ECU problems but knowing what part of the ECU is acting up helps repair it.
Or you could actually have a problem with the car.

Steve