Engine Surging

[Gippo]

My MX3 SE 1.8L surges when it is cold. On start up it revs up to 2500 rpm, then drops off and then goes up again. Sometimes it will just stay between 1500 and 2500 RPM for about 2 minutes then it goes to normal idle and is fine. This only happens on initial start up. After that it is fine. No vacuum leaks, adjusted the idle, checked the rad for pressure and fluid. etc etc etc, could it be the EGR?????
Thanks in advance PM me with your help

[fry_81]

unfortunatly thats normal.
i guess it just does it too heat of the engine faster.

[IanL]

The engine needs the high idle until it's warm; otherwise it would be a pain to drive.

But it should not surge upwards again once it drops down. It sounds like the idle air control valve is a bit sticky.

<small>[ November 20, 2004, 03:16 AM: Message edited by: IanL ]</small>

[Gippo]

Is there anyway to unstick the idle air control valve? I have owned other MX3s and they didn't idle that high at start up, at least I didn't notice it
Thanks

[lakersfan1]

Originally posted by Crash Test Dummy:
Is there anyway to unstick the idle air control valve? I have owned other MX3s and they didn't idle that high at start up, at least I didn't notice it
Thanks

You'd have to take the throttle body off and clean the little crevices with lots of carb cleaner.

[Gippo]

Thanks I'll try that

[babyblueMX3]

my guess too is the IAC that is the problem