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Old June 8th, 2011, 05:16 PM   #5
ScOoTeR
hoo dat. wat.
 
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Quote:
Originally Posted by osteologation View Post
I was under the impression that all a smog pump did was pump air in so as to dilute the exhaust and cheat the sniffer. Also MIL?
Doesn't "dilute" - it adds oxygen to the cat to burn the unburnt fuel in the exhaust from running too rich. Think of it as "fanning" flames to make the fire hotter.
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