After I installed the 48mm TBI, my laptop crapped on me so I really didn't get any first hand data. I got WinALDL going again and now I find my IAC counts at idle are around 14! They used to be like 32 and 35.

The vacuum holds fine where it used to at about 33-35 kPa. Could I have a vacuum leak?

I opened the throttle plates a smidge with the adjustment screw and drove around like that for a while (laptop crapped again). Then last night I was on my way home and saw that the IAC counts were 0!!! It idled just fine as always, right at 575 RPM and 33 kPa.

Any thoughts?

 

10 - 20

Opening the throttle blades requires the IAC to close to maintain the programmed idle speed. That is why you are at 0 now. Close the blades a hair to get the count up a tad.

 

as long as you don't think I have a vacuum leak I'm cool.

I have to keep the throttle screw turned in just enuf to keep the plates from "jamming" in the bore. The plates came out of a TPI 'body, and the bevel on the plates is setup so they are at more of an angle than the TBI plates. So if I close the throttle too much they stick, and that sucks when you're going the drive thru at Taco Bell and the throttle plates snap open.

 

0 - 5 with the bigger cams, 5-15 with the smaller cams.