Surging Idle

Sterling 4.4 · #1 01-14-2007, 12:25 PM

Last night on the way to dinner with the wife, I noticed that when stoped at a stoplight, the RPM's surged from 600-900RPM. It happened on the way there and again on the way home. I have an '06 4.4 w/ 23K on the clock. Before I take it to the dealer so they can sit on it a week,only to tell me all is normal, does anybody have any ideas as to what this might be? It was 30 degrees out last night here in SoCal, but I have never noticed it before when we go to the mountain where it is just as cold.

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noncom23 · #2 01-14-2007, 05:43 PM

? Clogged throttle body?
Seems to new for that though.
Maybe idle control valve...

shodanusmc · #3 01-14-2007, 06:01 PM

No, its not normal. I agree it could be the TB or the IAC, or several other causes. Take it in, and see what the Tech finds. It should not be that big of a deal or a long fix.

Sterling 4.4 · #4 01-15-2007, 12:00 AM

I have a Dinan TB. I hope that didn't cause anything. I take mine to Pacific BMW in Glendale, but they aren't a Dinan Authorized dealer. Any suggesions on a good Dinan authorized dealer in the Los Angeles?

noncom23 · #5 01-15-2007, 10:58 AM

Incidently Sterling. How did that Dinan TB change your performance?
Any info would be helpful. Let us know about the outcome.

Sterling 4.4 · #6 01-15-2007, 05:12 PM

I have the TB, CAI, and the exhaust. Seems faster, but I have no dyno or times to compare to.

noncom23 · #7 01-15-2007, 05:30 PM

Quote:

Originally Posted by Sterling 4.4

I have the TB, CAI, and the exhaust. Seems faster, but I have no dyno or times to compare to.

Thx.

RamVA · #8 01-15-2007, 05:51 PM

I agree it could be the throttle body or idle control valve.

I'd also look for a vacuum leak somewhere near the TB. You can find it by spraying brake cleaner around the various vacuum lines while the car is idling.

I had this problem with my CRX for months and couldn't figure it out - it was a bad coolant temp sensor which was giving the IACV fits.

Good luck.

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