Has anyone else experienced this problem, and if so, what is the fix? I have an '03 with 5-speed V6 combination with 14K miles. Sometimes, but not always, when I am slowing down to stop, the engine idle speed drops to around 500 rpm and is very rough(typical idle is around 900-1100). It feels like it is going to stall. This just started about a week ago. The best I can tell, it doesn't matter what gear I am in and doesn't matter if I have my clutch in or not (yes, I know it will stall if left in gear and the clutch let out . Also, it doesn't do it everytime I put it in neutral. Any help would be greatly appreciated.

Thanks,

Ox

 

Sounds like it could be your IAC (Idle Air Control) valve. If your idle fluctuates, stalls, idles high or speeds out of control you can do the following checks to see if it is the problem:

First unplug the connector to the IAC valve. Then turn the ignition switch to the on position (motor NOT running).

Measure the voltage on the connector side (not the IAC valve) and you should have between 10.5 and 12.5vdc. If so then it is getting the proper voltage from the PCM.

If that checks out good them you will want to measure the resistance between the two connectors on the IAC valve itself. The resistance should be between 6 and 13 ohms.

Then measure the resistance from one terminal (don’t matter which one) on the IAC valve to the valve body itself. That should read 10,000 ohms or higher.

If either resistance measurement is not as listed then you have a bad IAC valve circuit and it will not operate properly, more then likely it may be due to a carbon build up inside the valve.

 

if its an 03...isnt it still under warrenty? Just a thought..hehe make them fix it....but i would have to agree with 01xlt about the IAC

 

Of course they will fix it. I just don't trust them to find the problem. I want to go in prepared with something for them to check!

 

good plan!