High idle

[b00zt3d spyd3r]

Today I noticed my car wasn't running quite right. I looked under the hood and noticed my j pipe was loose...again... Tightened them up and went to Walmart to get coolant was fine. Put coolant in and now it is idling high. Idk if that has anything to do with it but I've looked everywhere for boost/vacuum leaks made sure everything was tight and in place. Iac is good car idled even higher with it unplugged. Idk what else to try. HELP!!

 

[b00zt3d spyd3r]

To bleed air from the coolant, open the coolant cap and set it aside on a COLD engine. Run the motor to operating temp and wait for coolant to bubble out and reinstall the cap. Normally I do this, then drive around and try again after the car is cool. You will see air like a gulp in the coolant.

The radiator cap or over flow rank cap or both

 

[ThunderChild]

Yes with a FIAV block off plate.

And burp the coolant with the radiator cap off

 

[tsi617]

You don't need a faiv even in the North East, it just is like a choke on a carb. Compensating for the temps to aid in idle.

Please report back in any leaks you find as things like this are searched and may help the next guy with the same problem.

I doubt you have a faiv issue. You don't need to run hot to have air. The temp switch is in a place where you can develop a air space, however unlikely, and this will cause the ECU to change the fuel tables and stay in open loop. The main thing causing the issue is more than likely excess air past the maf.

Does the exhaust smell of fuel? What's your AFR at idle?

 

[tsi617]

Cap off the radiator with it COLD!!!!

the overflow is under no pressure, it's a place to burp excess coolant to.

 

[b00zt3d spyd3r]

Well I seem to have fixed my idle issue. The throttle body adjusting screw was loose and looked like it was further in that it should have been. Backed it out some and tightened it up and it's idling normal again