Quote:
Originally Posted by Frank Lee
Re: yet another test with pumping air and the O2 sensor: I wonder if simply unplugging the O2 would keep it in open loop; at least then the ECU would be running off the map and not try to correct the "lean" condition...
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Speaking only from my experience on tuning 3800s in SD mode we can keep the ECU in open loop by removing the plug for the MAF sensor. That prevents the car from going to closed loop but allows you to see the O2 values.
I do believe that disconnecting the O2 should do the same thing but allow you to read the MAF sensor in open loop.