[schmaydee]

....had my engine redone...(L28 P90A heads)....i just cant get this thing to idle @ much less than 1000 [email protected] one time i "tee'd" a line off my manifold (bypassing the vac-modulater) straight to the aac and it work'd (for a little while) but then went back up to 1000 and stayed there.....
i've rearranged the tubing on the vac-canister,timed it,chg'd hoses nothing seems to help.....s

 

[Nicks 83zxt]

I've heard that there is an idle adjust screw on the underside of the intake manifold.

Nick

 

[greydog]

I'd check the aac valve and the vacuum modulator to ensure that they're working correctly and that the aac is closing all the way. I'd also make sure the air regulator isn't sticking partially open. I'd look for leaks in the intake system using propane.
If all that checked, I'd try the bypass screw on the afm a little at a time. Maybe someone else can remember if you turn clockwise or counterclockwise to reduce idle speed.
Dan

 

[schmaydee]

thanks a lot!
I appreciate the info....what does the vacuum modulator do?.....s