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1998 Nissan Altima

Question: Bckfiring

Question

getgordon, 2.4L 4 Cylinder, Valrico, FL, February 23, 2011, 18:59
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Twice a day, Engine cuts off, vehicle backfires, there is a smell of gas.

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  • Answer #1

    patrick mannion from Greg Solow's Engine Room, February 23, 2011, 19:26
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     Master

    It's hard to say what is wrong without being able to experience the problem first hand and doing basic tests. Back firing through the intake/air filter is usually a lean condition, backfiring in the exhaust is fuel being burned in the exhaust (excess fuel in the cylinder is burned in the exhaust by heat rather than by the spark crossing the spark plug in the cylinder).

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