Quote:
Originally Posted by UCSB VR4
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
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The ECU might’ve just given up looking at the MAF input during idle, which is why your changes aren’t having any effect.. I suggest resetting the ECU, and then tune – watch your AFRs and trims. Get the trims in line.
What T-Pro version are you using?
-Rogue