08-23-2016, 07:33 PM
Join Date: Nov 2015
Total Cats: 11
Cannot figure out why my idle is so high??
'92 with a '96 swap in it.
If the car is completely cold and i start it, it will idle around 1100 rpms or so albeit rich ~12.5 afr.
As soon as i touch the gas, rpms jump and will hover around 1700-1800 rpms. With the car fully warmed up, and if I unplug the IACV plug, nothing changes???? I was going to follow the how-to related to using the breather screw to set idle without IACV involvement, then run the tests to establish open/closed values for closed loop idle, but apparently I can't even get that far into it...
My breather screw is all the way in and my throttle body plate adjustment screw is barely touching the throttle mechanism (but not putting pressure on it as to holding it open at all). My throttle cable also has a bit of slack so it's not holding it open from what I can tell.
Attached is my current MSQ file and a few idle logs on that MSQ file. I've been reaching out to Brain but I figured i'd post up here too. The car is constantly hitting over run fuel cut so it has an up-and-down idle.
Car is running sequential injection, braineack built MS2, garrett gt2560r, and has a walbro 190 and fuel injector clinic 650's.
I've verified that both nipples on the back of the intake manifold (runner 4) are capped still.
Looking at the spec sheet for these injectors, it shows the offset value should be 1.20ms @ 12v and .93ms @14v at 43.5psi of fuel pressure if that helps.