HondaCivicForum.com - weird reving

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p77iceman

06-21-2008 01:43 PM

weird reving

I have a 93 hatch back with a h22a swap. When I start it the engine revs then stops the revs then stops, it does this until I have been driving for like 10 min or so. A buddy of mine said it could be the ECU. If any one can help I would appreciate it.

Thanks

trustdestruction

06-21-2008 04:36 PM

RE: weird reving

is this only while at a stop or while driving too? it's kinda normal for your rpms to be a little weird at first with a cold start, and then go away. It could be normal, or if it seems abnormal to you it could be a dirty idle air control valve, that is if it's only doing it at idle.

RonJ	06-21-2008 04:53 PM

RE: weird reving

1 Attachment(s)

Also check and clean the Fast Idle Valve:

Attachment 26588

mk378

06-21-2008 05:20 PM

RE: weird reving

If it has always done this since the swap, you may have some mis-matched parts.

p77iceman

06-21-2008 07:08 PM

RE: weird reving

I've had the car for about a month and it already had the swap. And it only does it while at idle.

trustdestruction

06-21-2008 07:20 PM

RE: weird reving

Sounds like it's your IACV (idle air control valve) or your fast idle valve. Clean them both with carb cleaner and see what happens.

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