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Car running rich?

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Old May 2, 2010, 02:48 PM
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Car running rich?
My evo 8 is running rich? what can I do to possibly stop the backfire and the car running rich. WOT the car backfires like crazy.
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Old May 2, 2010, 02:48 PM
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btw I changed the spark plugs. took out all the old fuel and put new fuel. and I put octane booster. my last set of spark plugs were really black
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Old May 3, 2010, 05:55 PM
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perform a boost leak test first.
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Old May 3, 2010, 10:11 PM
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so many possibilities that it could be...is the car tuned do you have a wideband?
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Old May 5, 2010, 08:17 AM
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did add any mod? Black smoke is a sign of unburn fuel. Did your ever got tune? could be the coil going bad! But we need more info on your car
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Old May 6, 2010, 06:41 PM
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I doubt the car is tuned but idk i did buy it from the auction. It has hks carbon tiexhaust, manifold, uicp, licp, and injen intake. I'm thinking maybe the catalytic converter is choked up or clogged.
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