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Old 11-30-2002, 06:47 PM   #1
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Join Date: Apr 2001
Location: Massachusetts
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Car: 1991 Camaro Z28
Engine: 350 TPI
Transmission: Built 700r4
Axle/Gears: 3.73

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can a bad o2 sensor cause backfire?
My car has been backfiring lately when I let off the gas. Today I replaced the plugs, distributor cap, rotor, ignition module and fuel filter. I regained most of my power but the car still backfires after high rpms when I let off teh gas. It seems to be running lean when I step on the gas and get rich when I let off. Could the o2 sensor be bad?
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Old 12-01-2002, 12:17 AM   #2
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Car: 1991 Camaro Z28
Engine: 350 TPI
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anyone?
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Old 12-01-2002, 07:10 AM   #3
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Are you getting an engine fault light?

It sounds more like the distributer is wearing out. Get a timing light and check if the timing is wandering around instead of staying constant in the same place when the engine is at a steady rpm.
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Old 12-01-2002, 09:50 AM   #4
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Car: 1991 Camaro Z28
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there is no check engine light. everything seems fine. i will check the timing i guess and see whats goin on.
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Old 12-01-2002, 09:50 AM
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