4g63 Low Idle Problem

[BigRed12]

Well guys... I am about fed up with this car. I am now having an idle problem, very low specifically. I have checked the TPS and the IAC/ISC both are good. I first thought it was a vacuum leak, but the sound I was hearing sounds more like air past the TB plate.

I have checked all the couplers for the IC and they are all tight w/o any MAJOR leaks. I am about to check to see if there are any misfires.

Does anybody have any other ideas of things I should check?

 

[92AWDHX40]

Terry's Talon Troubleshooting Tips #3 - Fast Idle (aka. Idle Surge)


do a BOOST LEAK TEST.

 

[Tyeler18]

Since you've checked your TPS and IAC, what are they reading? At idle (what is your base idle since you didn't state any) what is your TPS voltage registering and what steps is the IAC at?

Edit: A vacuum leak should cause an increase in idle or the typical DSM idle surge.

 

[92AWDHX40]

Terry's Talon Troubleshooting Tips #3 - Fast Idle (aka. Idle Surge)

Test the isc what are the measurements.

 

[BigRed12]

ISC resistances were all about 31.7 ohms... and TPS resistance was about 4600 ohms with a change when rotating the throttle plate.

 

[92AWDHX40]

Read and go through the steps and eliminate them one by one.

 

[BigRed12]

Well... im a retard... I managed to check all the IC couplers but failed to check the one for the intake at the turbo. All fixed now... sorry for the wasted thread.

 

[AWD Street Terrorist]

It's not a wasted thread if you made progress and didn't condemn your DSM because of frustration. You systematically worked a problem out and now you know more about your car. I'd call that a win.