really high idle on new engine, what to do?

[1Gina2G]

This is a full rebuild, I place the cam postion sensor exactly how it was on my old head, and I haven't moved the BISS idle screw on the throttle body, after adjusting it before the rebuild. I've tested for boost leaks before and there wasn't any, but the first time I started it up I heard some air leakage noise by the TB / fuel rail area but not the second time I started it up.

It wants to idle as high as 2,000 -2,500 and turning the BISS screw and adjusting the cam sensor doesn't help much, so I haven't let it run more than a cupple minutes, as the idle actualy seemed to be increaseing. One time it just decided to cut off under a minute of running.

isn't 2000-2500 way to much for even just starting up?

 

[92AWDHX40]

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


read this.

 

[boost97gst]

And your extra sure your throttle plate is completely closed? That was my problem after my first rebuild. Very simple, im sure you checked it already. Boost leaks beforeTB wont do anything obviously. Check any hose or gasket that could get into the intake mani post TB.