Quote:
Originally Posted by FNG
That has nothing to do with engine temp. The rough/less responsiveness is cause by the cold start function where the ECU tells the engine to run rich to get the catalytic convertors up to operating temp faster.
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That's not necessarily true. The hotter the engine is, up to a certain point of course, the more efficient and powerful it is. Once you exceed a given temperature, though, power drops due to excessive cylinder head temperature. It's different for different engines, but an engine up to operating temp runs better not just because of cold start programming. True cold start typically only takes place for 10-60 seconds, anyway.