backfiring???
Thread Starter
TECH Enthusiast
Joined: Mar 2004
Posts: 647
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From: Jupiter/Gainesville, Fl. The other "U"
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
On The Tree
Joined: Dec 2001
Posts: 126
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From: Sherman Oaks, SFV , CA.
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.
Thread Starter
TECH Enthusiast
Joined: Mar 2004
Posts: 647
Likes: 0
From: Jupiter/Gainesville, Fl. The other "U"
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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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.
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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.
