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A rich burn condition would cause too much fuel to build up and oxygen would be available at the catalytic converter during deceleration resulting in backfiring and excessive heat in the catalytic converter. Check the O2 sensor, air filter, injectors and plugs for anything that might allow raw fuel into the exhaust system.

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โˆ™ 2006-04-11 19:13:39
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Q: What would cause a vehicle with air injection emission control system to backfire during deceleration?
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