backfiring???
11-26-2004, 09:26 PM
#1
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backfiring??? ok, whenever i start my car up, it starts making these "popping" sounds and it seems like its backfiring....i changed my plugs last week and this really reduced the popping a lot but it still does it.....can any1 help me here???tia
11-27-2004, 01:52 AM
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i have slp longtubes, y-pipe w/gutted cats and cutout...it has 36k and i had a cam put in bout 5k ago.....hope that helps
11-28-2004, 12:22 PM
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Your backfire could be due to an exhaust leak. I have LT with a custom catted y-pipe and it only popped on deceleration and down shifting. The backfire slightly increase after I gutted my cats. If you have auto-tap I'd also would check for misfires to each cylinders for a possible bad plug wire or spark plug.
11-28-2004, 09:04 PM
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it only does it on a cold start....reduced a LOT after i changed my plugs/wires...my mechanic said there was a misfire code....could it be from the gutted cats???
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11-28-2004, 11:11 PM
#8
Are you sure it's just not regular exhaust sound? i get popping and crackling when cold/start-up and also when i disengage the clutch under deceleration. I have a dynomouth exhuast (bullet muffler). If you're just running the cutout open, your sounds are normal. you just don't hear them with a real muffler on there.
11-28-2004, 11:22 PM
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Exhaust leak or bad O2 sensor. Could be something loose too - like a lid, or MAF/TB clamp causing a bad read in the ecm making the car run rich. It's rich, which is causing the backfire IMHO.
