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mike100 · 08-18-2017

I never posted much on the subject, but after fixing all the stuff under the plenum, I assumed that i had some throttle plate leakage that wasn't worth fixing. what I did was include a restricted pipe in the pvc to the throttle body inlet tube that runs along the left cam cover. So as to have full ventilation on the pvc pipe, I T'd another vacuum tube to an atmospheric vent filter...like one of theose k&n type mini filters you see on valve covers.

I could always have 15-20 counts on the IAC reading on my Tech1. this pretty much allowed the target idle to be satisfied also. Of course i hid the tee'd vacuum circuit for emissions testing, but that was pretty easy.

08-18-2017	#9
mike100 Join Date: Feb 2011 Location: San Marcos CA Posts: 1,802	Re: IAC question... I never posted much on the subject, but after fixing all the stuff under the plenum, I assumed that i had some throttle plate leakage that wasn't worth fixing. what I did was include a restricted pipe in the pvc to the throttle body inlet tube that runs along the left cam cover. So as to have full ventilation on the pvc pipe, I T'd another vacuum tube to an atmospheric vent filter...like one of theose k&n type mini filters you see on valve covers. I could always have 15-20 counts on the IAC reading on my Tech1. this pretty much allowed the target idle to be satisfied also. Of course i hid the tee'd vacuum circuit for emissions testing, but that was pretty easy.