idle has hesitation?

**ssxcytmnt** · 11-27-2006, 02:41 PM

My car seems to be idling low, When i put it into gear the idle drops down to about 250 rpms the goes back up to 750rpms, It doesnt always do it but does it quite often....The fuel filter is first on my list to change, any other suggestions?

**fast enough Z28** · 11-27-2006, 03:02 PM

I would clean your butterfly valve on the tb and clean the iat sensor. If its none of those maybe your throttle postion sensor is bad.

**z28punk** · 11-28-2006, 06:56 PM

i had that exact same problem on my Grand Prix GTP.
all i did was take the IAC out and cleaned it, and i also took the TB off and doused it in TB cleaner.

i never thought such an easy fix could have such a big impact on performance

**GatorSS** · 11-28-2006, 07:37 PM

Clean the MAF sensor wires, too.

**Steve Crowe** · 11-28-2006, 08:34 PM

Classic symptom of an IAC having a gummed up pintle &/or seat. Piece of cake to remove and clean with a can of Berryman B-12 Chemtool.

A leaking EGR can also cause this, also an easy item to remove and clean.

**adham** · 11-30-2006, 01:21 PM

im having the same problem
stupid question but where do i locate the IAC and IAT??

**sunsetorangess** · 11-30-2006, 01:55 PM

I would clean the iac like said above also clean your maf, you can pick up some maf cleaner and use it for both. Brake cleaner works great too clean you iac but the other spray will work.
The red circle
The iat is the lil sensor in the airlid. Toward the motor.
J

**adham** · 11-30-2006, 03:46 PM

Originally Posted by sunsetorangess

I would clean the iac like said above also clean your maf, you can pick up some maf cleaner and use it for both. Brake cleaner works great too clean you iac but the other spray will work.
The red circle
J

thank you!

**Steve Crowe** · 11-30-2006, 03:58 PM

The IAC is located in the side of the throttle body. Black plastic, about 1" diameter by 1-1/2" long. It's held in by two small Torx screws or in some cases allen head screws that you need to take care not to lose when you remove it.

The IAT is simply a temperature sensor that's somewhere in the intake airflow before the MAF and throttle body. It rarely causes problems it can't hurt to clean it, matter of fact just the action of unplugging & reconnecting the connector to it can be of benefit.

I'd be very careful as to what you use to clean a MAF, as indicated above brake cleaner is usually safe but you really need a cleaner considered safe for a MAF.

Here's a starter page to look at: http://www.gatewaycleanair.com/mecha...4/dirtymaf.htm