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Old 04-26-2012, 10:11 AM   #546
Scooby Newbie
Member#: 314053
Join Date: Mar 2012
Location: Northern Michigan
2012 Impreza
Marine Blue Pearl


Originally Posted by ocellaris View Post
It is burning more fuel to heat up the catalytic converter faster to reach the point of cleaner emissions. Also the engine operates more efficiently and burns fuel better when it reaches operating temp. With a cold cat and a cold engine block, there is a lot of pollution coming out the tailpipe.

Originally Posted by ST Eye View Post
I don't think it burns more fuel at startup. I think it runs leaner (less fuel) which heats up the catalytic converters quicker.
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