Racing Idle

[white00GT]

Good news and Bad news; I just did a couple of different things and I cured my idle problem. Although I haven't been able to cure the idleing at ~1800-2100 every 7 or so starts.

Originally posted by Snakeman
Make sure all the vacuum hoses are properly attatched and parts installed properly, i.e. IAC. the iac valve lets in a small amount of air to keep the idle steady. without it in place, or with it not functioning, you will have the roller-coaster idle. to pinpoint vacuum leaks, try using carb cleaner sprayed around suspect hoses to see if the idle changes.

did you do any recent mods that might have caused it?

Your right I just swapped my IAC valve, and it cured the rolling idle. I got a new one for two reasons; mine was hanging because of the carbon, and also most importantly the little black cap that is on top of it, I was mssing.

That little black cap popped off of mine at the track about a month or so ago. Seems like I pulled on the fuel line and it popped off or something like that.

I couldn't find it so I put a rubber nipple ontop of the brass tube to stop the air leak. It turns out the black cap is some type of vent or beather or something; not quite sure.

After switching the IAC valve, and moving the idle to 1000-1050 the rolling idle is gone. But this steady elevated idle ~1800-2200 every 7-8 starts still presist.

Checked for air leaks have none.

Any thoughts?