Recently done a bunch of upgrades to my 32 sedan and having some issues with the AFR. Was standard rb20det with just ISR exhaust, FMIC, and an op6 turbo until the seals decided they were done on the turbo.
So I got a new gt2860rs, nistune (installed and tuned by rs enthalpy), deatschwerks 550’s, aeromotive fpr set at 45psi, walbro 255 , z32 maf, and aem UEGO.
Upon start up my wideband reads 14.7 but within 5-10 seconds will peg out to - - - meaning lean. I tried hooking the white wire (signal output) from AEM to the white wire on the o2 harness but it didn’t make a difference? I’ve also tried putting the sensor in the upstream (3” from hot side) and downstream (36” from hot side) positions with no luck on either?
If it’s in the upstream position and under a lot of throttle it will richen SOME (16-17) but shouldn’t it be sitting around 13-15 at idle??? Have not tried driving the car yet to put it under load…
Am I missing something? Seems I’ve misplaced my old o2 sensor but should I just get another and resort back to narrowband to see if that fixes the AFR?