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Old 08-03-2012   #26
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Join Date: Aug 2006
Posts: 2,058

Re: Charcoal canister affect gas mileage?

Smog pump just puts fresh air into the exhaust manifolds through one way valves from the diverter valve.

It also puts fresh air into the catalytic converter and fresh air back out into the air. All it does is heat up the catalytic converter faster and dilutes the exhaust gas mixture so that it passes emissions. Otherwise you need to computer tune the engine to get it to pass emissions easily.
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