Yes I know I no longer have my S, but I had this problem when it was mine and it is still a problem for the friend who bought it from me. The car will drop rpms as usual(normally) while coming to a stop most of the time. Sometimes it drops a bit low and the engine will rumble as if it wants to stall, but it will pick up again and idle fine right after. This only happens sometimes when starting the car, or when coming to a stop. Any ideas to the problem?

 

had this on my 03. pretty sure it was related to the map sensor. i know some have done the good ol' map whack, but actually, disconnecting and reconnecting it might fix it. a good throttle body cleaning wouldnt be a bad idea either. all i did was replace the map sensor, to the updated one with the zip tie.

 

^ thank you for input. will see if this may be the problem.

 

search map whack. this problem has been beaten to death.

 

Car here last night had it.

Did a valve adjustment, and put dielectric silicone on the MAP connector.

The car was not here for that specifically, but the dropping idle went away completey.

 

called my friend and were going to take care of it tonight. Hopefuly this solves the problem for him also. ill update once done.

 

Interesting... Mine will do the same thing almost everytime I come to a stop or start it up... Just shudders and loses idle for a sec and then regains idle...

 

this may have to wai until later. could not get a hold of my friend at home or on his cell. no clue where the guy is at this point.

 

i have the same EXACT problem..

 

Interesting, I'm gonna try that. Not the whack itself, but the silicone dielectric grease. Mine dosen't stumble when it's warm, but it still does occasionally in the first 10 min or so of driving.

I thought MAP sensor was only associated with stumble during hard acceleration? I thought the idle stumble was almost always the ECU freaking out after a reset or due to ambient conditions? I'm gonna try the grease. Thanks Billman250.

To the OP: Has your ECU been reset recently, or battery disconnected? When did it start stumbling?

EDIT: Shoot I'm gonna have to score another $6.00 zip-tie.