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Old 04-25-2012, 01:02 PM   #539
ST Eye
Scooby Specialist
 
Member#: 73068
Join Date: Oct 2004
Location: MD
Vehicle:
2008 STI Boost Wagon
2014 Honda Accord Hybrid

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Quote:
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.
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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