Originally posted by Raf99
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cold engines run at a higher rpm for quick warm up.
why was this happening? ecu disagrees on engine temp because of faulty readout from coolant temps.
no throttle and the ecu defaults to open loop.
open loop and cold temps detected, ecu automatically tells engine to run higher rpm through fia or rotary valve. intake air Temps not corresponding with engine coolant Temps = your problem.
when you revert to open loop, cold start conditions(no throttle) apply if the coolant (car) isn't warmed up yet.
why did it go away over time? Ltft relearned how to operate with good coolant temp readouts. first cycle, it does what it did last time. over time, the ecu automatically adjusts and realligns with defined parameters within the ecus tune.
hope that helps..that's a short version of a fairly complex, long answer
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