Cartrax
Well-known member
Just installed a new heated O2 sensor. Issue is it pushes a flat 450 mv with the car ("84 Vette) running hot. No short in O2 ECM connection and I bench tested the O2 sensor it passed. Also bench tested the heater - applied some juice and got heat. On the car I doubled checked the hot wire to the heater - gets 12V on ignition. Sensor is just past the long tube header collector on the driver's side.So - I'm stuck in open loop, can't tune it, and it's getting embarasssingly horrible mileage. Anybody have any trouble shooting suggestions?