Hey guys I’m looking for little help. I just picked up a 92Si a few weeks ago. I traded my Acura legend for it. All and all the car pulls hard and it’s a nice car. It has a few visible performance mods headers, CAI, and cat back. But there is one problem, when the car idles it bounces from 1000rpm to 2000rpm back and forth. Does any one know what could be causing it to idle that way? The guy I got the car from bought it from this guy in NY and he has no idea if he did any motor work to it. Any info will be greatly appreciated

 

You guys are no help

 

I have seen this problem before but unfortunatly I don't remember the solution.

 

I think i need a new IAC (idle speed motor) does any one think that could be the problem

 

Idle air control valve? (IAC) Could be an issue. Among other things.....check all of your vaccum lines and make sure they haven't crimpped, rotted, or fallen off. Check your map sensor connections.......get a Haynes Manual that will tell you how to test each and every thing on your vehicle.

 

usually Fast Idle Control Valve plunger has come loose.

 

Would you replace the whole valve or just take it off and smack it around a little?

 

Fast idle control valve is the likely culprit followed by a vacuum leak. Check both.

Mike

 

With that attitude, I'm suprised anyone helped you.

 

If you notice he posted that 30 mins after his original question. Patience.

 

could have waited atleast 12 hours, if not 24 hours.

People are so lazy on the internet. They want it now without doing any research!