I disagree with your disagreement.

He said the smoke appeared only on first startup in the morning. Coolant in the combustion chamber would not display as steam when the engine was first started, that cylinder might not even fire at all until the engine was warm enough to dry the spark plug, and upon first start the entire exhaust system, from manifold to catalytic converter to muffler is cold which would condense any steam into water. There would be no "puff of blue smoke" in that situation.

Tony, you've forgotten more than I'll ever know about computers, but I've been a gearhead since I was 12 years old!

tanstaafl.