1200RPM idle post 62mm TB install

[Purple]

anybody experienced that? Sometimes my jeep just does not want to idle right, it started happening after installing the bored TB. Most of the time it idles around 1200 rpm. Its a 98 4L auto.

 

[witt]

did you reinstall the gaket? was it damaged? cuz air could be squezing in....

 

[Dr. Dyno]

A vacuum leak around the gasket could cause a high idle so make sure that it's sealing properly. Also make sure that the vacuum from the MAP sensor is connected properly. Otherwise, just disconnect the battery ground cable for a few seconds to reset the PCM and then reconnect it. Often it takes time for the PCM to adapt to the bored TB and bring the idle back to normal.

 

[johnnyc]

There's also an o-ring where the IAC goes into the TB. Make sure it's still there and in good shape.

 

[spazegun2213]

this happened to me when a friend bored my TB. The butterfly plate, if it does not fit perfectly then it will cause a high idle. It was fixed after he made me a new plate for it.