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post #10 of (permalink) Old 03-02-2017, 05:28 PM
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Biggest change will be fueling, and possibly the spark. If the fuel tables are too rich or lean for the timing/RPM then there will be a miss. Usually though the fueling at cooler temps tends to be rich. So that's my guess - too much fuel in open loop. Data verification should immediately clarify this though.

As soon as it switches to closed loop, it runs at stoich, so unless there are issues with the O2 sensors, vacuum leaks, or other various mechanical deficiencies, fueling issues usually go away at this point.

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