Originally Posted by
lionelhutz
Interesting. Does anyone know what that is actually doing?
The CATS Tuner $42 definition seems to call it the "Air Fuel Ratio at Startup Vs. Coolant Temp. (Choke)" and describes it as "This cold engine AFR vs. coolant temperature table is used to control engine AFR after the ECM has gone into “closed loop” and prior to reaching normal (or near normal) operating temperatures."
But that doesn't sound right to match what you're finding. It would seem like this value is subtracted from some starting AFR number when calculating the desired AFR for the engine when it is first started. Maybe it uses this to calculate the AFR until the closed loop timer expires????
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