Car 1989 GTR
PFC,Z32 AFM's,800cc Sard Injectors,Boost kit, Trust t618z turbos, big IC etc....
My car is set up correctly with correct injector settings for the PFC and my 800's
no leaks in intake system, pressure tested it, no stuck injectors. o2 feedback turned off
I have checked all my sensors,
MAFs are 1.1v @ idle
Vacume -630 milli bar @ idle is dead on,
FPR @ idle is dead on 36 PSI hose on, 43 PSI hose off.
Coolent temp is good
Air temp is good
TPS .5v & Idle switch on @ 0% TPS
My car runs excessivly rich at idle 10:1 AFR, no amount of adjusting the INJ map will bring it up past 13:1 AFR and even at that 13 afr the map must be adjusted to ask for a 29:1 AFR.
I have adjusted the AirFuel offset from 100% to 40% to bring it up to stoich but after some reading this is not what that adjustment is meant for. from what i gather it is meant for quick observations of load and the relation of mixtures. so to permanantly leave this vale @ 40% is unacceptable to me.
I am leaning towards it being a vacume issue. I capped all the unused pipes when i removed the carbon cannister(EVAP) as well as capping the unused pipes from the factory boost solonoid as well as a couple other which i found under the plenum. I am thinking maybe that their was sposed to be a open to atmos pipe to regulate mixtures at idle. can anyone confirm this. BTW Car idles fine, great actually its just overly Rich. I have been scratching my head on this for several weeks any help would be greatly appreciated.