Quote:
Originally Posted by RedDevil
Yeah, I was wondering about it.
It might factor in intake air temperature, in which case it does matter.
Once the O2 sensors work and the engine is still cold it will certainly matter.
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In Torque on my car at least as soon as the O2 sensor signals stop showing 0V the ECU indicates that it is running in closed loop. If you give it gas it might run a little rich due to the ECU not being so accurate at gauging volumetric efficiency under transient load, but I'm fairly sure narrowband O2 cars don't enrich the mix when cold. If the engine needed to run rich while cold, it would never pass emissions. Running rich doesn't make warming up any faster either, it's better to run stoichiometric to deliver the max amount of heat to the catalyst.