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john70t john70t is online now
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Join Date: Aug 2001
Location: midwest
Posts: 25,471
It depends on whether or not the car sat, was started cold, quickly reved, and way out out of specs to begin with. Other things are bad gas, extended idling, and oil that needs changing.

Testing the CO levels(which=fuel mixture) before and after the cat will tell you if it's working or not. A hole can be drilled and rivited to achieve this if necessary... A lazer thermometer(I've been told) on a good working hot cat will show at least 100 degrees temp difference between the two which means the platinum/paladium inside is burning up the HC's.
Changing intake/exhaust systems and removing the cat may cause a headache if the tech knows what he's doing. Staying stock and well maintained is best.
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Old 12-31-2003, 04:09 PM
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