Quote:
Originally Posted by ennored
When you power back up, the ECU is programmed to wait for the O2 sensors to warm up. Newer cars have some logic to know how hot they are, but older ones just had fixed timers. 20 or 30 seconds of open loop could kill any savings you got shutting off the engine.
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Does an injector kill switch get around this? Even my 2014 car still goes open loop for about 5 seconds after key off.