Quote:
Originally Posted by steve99
What about fueling ?? does car remember fuel trims ?? if its "corrected" a lean mixture maybe that would cause the reduction in knock on subsequent drives ??
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That was my first thought. I've found that the trims can go a bit wide in either direction during warmup, sometimes causing a larger than normal ltft for the first few minutes of driving. I'm not sure if this is unique to my car as I haven't logged it on any but mine. Better coolant temp fueling comp tables would certainly help.
Also, if you have miscalibrated aftermarket injectors this will happen, often far more pronounced as the car runs in port only mode during part of the warmup phase.