Quote:
Originally Posted by jcp
I remembered reading something about a cold start so I went to the garage and pulled out the owners manual for my '99. It says "drive moderately and avoid engine speeds above 4200 rpm for the first five minutes".
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All auto manufactures have similar guidelines.
Its as much about Catalytic performance and longevity as it is engine performance and longevity.
Your O2 sensors and engine coolant have to reach a certain temp. before the ECU goes into closed loop and adjusts fuel to a more catalytic converter friendly mix.
Until then your engine is on an open loop or a cold start map which is rich in fuel.
Like the choke is on in days of old.
Rich fuel mixtures are not good for catalytic converters. So the guidelines of easy on the throttle for the first few minutes helps preserve the integrity of the Cat.