|
Forum Member
Join Date: Jan 2003
Location: San Jose, CA
Drives: 1992 3000GT VR4
|
Re: ---===The Official MAFT-Pro Thread===---
New problem:
Sometimes after the car is completely warmed up, I think the ECU is getting stuck in closed loop mode when at idle. When this happens, the afr goes to 13.0 and sticks there no matter what. Any/all changes I make to the Maft Pro have no affect. I've verified this by changing the mainscale by + or - 30%, having no effect whatsoever on the AFR readings.
I have both my stock O2 sensors UNPLUGGED, so, how is the ECU going into closed loop mode when at idle? How can I resolve this issue? I absolutely need to figure this out if I stand a chance at passing smog!
Please any advice is greatly appreciated. I'd rather not plug the stock O2 sensors back in just yet as I feel the stock low fuel trim adjustments are too drastic and cause cycling rich/lean conditions at idle. I'd rather let pt tracking and the wideband make all the fuel adjustments at idle. How can I get the ECU stuck in open loop mode at idle such that maftpro adjustments affect the resulting AFR???
- Jeff
__________________
1992 RED 3000gt VR4:
Air:
DR 650s, DSM SMICs w/ 1 3/4" piping, hard pipe kit upgrade & 2 pre-turbo (no-maf) pipes w/ filters, GReddy Type-S BOV (open loop).
Fuel:
MAFT-PRO v5.03 (SD mode w/ Electronic Boost & Timing Control, GM 3 BAR MAP Sensor, GM IAT Sensor, & Innovate LC-1 wideband O2), Supra fuel pump (hotwired), 550cc PTE injectors @ 45 base psi.
Ignition:
Magnecore KV85-R100 spark plug wires, Denso iridium IK27 spark plugs, Odyssey PC925 battery.
Engine:
.03" Overbore, 2nd-gen Lifters, polished heads.
Exhaust:
Gutted precats, ATR 3" downpipe, 3'' Test Pipe, ATR 3" catback.
Drivetrain:
RPS 6-puck disk, RPS lightweight flywheel, 3sx lightweight drive pulley, polyurethane motor mounts, stillen drilled and slotted rotors, 18x9.5 5Zigen FN01RC rims, BF-Goodrich KDW-2 tires, Cusco rear strut bar.
Miscellaneous:
Corbeau seats, short throw shifter, presidential alarm system, 8 inch bazooka tube, kenwood double-din deck, 300lbs of miscellaneous weight reductions... "who's your daddy?" license plate 
Future Mods:
1 Piece PST CFDS
|