What would cause the pcm stay remain or get stuck in Open-Loop mode? Im having an issue when I got my car back that the PCM is showing its running in open-loop. I scanned and checked via the LS1M. at first I thought it was because I accidentally, rather the mechanic, accidentally didn’t tighten the wiring harness for the B1S1 o2 sensor so it touched and got burnt against the rear header. ‘no problem’ I thought, so I limped the car home and took the wiring harness for the o2 sensor out and cut the section burnt and resoldered the ends again(never had a problem soldering the wires for the o2 sensor).
After everything was reinstalled, I also resetted the pcm via the powrtuner by doing a partial write. Waited 20 seconds and started the car up. Scanned via LS1M and the pcm still showed open-loop. I took the car for a short test drive and noticed anything over 10% throttle, my fuel pressure gauge went from the normal ~45psi to 100%psi ??? my WB was jumping around and checking my LS1M, the O2s were bouncing like normal, the IPWs didn’t drastically spike in relation to the fuel pressure gauge, BUT my LTFTs stayed at 0.0%???? I can only imagine driving like this would give me very bad mileage. Anything for me to doublecheck in case the mechanic forgot to reinstall a wiring harness or something else?
