Quote:
Originally Posted by jcp123
It's also to ... get the oxygen sensors warm enough to be able to read the oxygen stream.
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The Focus has two heated O2 sensors (narrow band); they warm up fast. My UltraGauge says I'm already in closed loop a few feet out of the driveway (cold start, and go with no idling warm-up). That was the case before my custom tune, as well as now.
Before starting I have the ignition switch in the run position while buckle-up, release the hand brake, etc. That may help with some extra time for the O2 sensors to warm up a bit.