Got a 2002 camaro SS with 23,000 miles, installed BBK long tube headers, dyno tuned, lid, AIR/EGR delete... That was about 4 months ago, been starting to notice the car backfires when I first start it, doesn't do it all the time just when it wants! And I'll turn off and start again and it won't back fire. And it will do it on cold or warm start. Does not backfire when driving. I also have new plugs also.

 

Not sure what your problem is but I've talked to some guys about my backfire issue. I keep hearing it could be the o2 sensors has gone bad

 

Did it start doing it after you changed the spark plugs, or was it doing it before..?

Have you checked all the coil connectors, to include the spark plug wires for a loose connection..?

How's you fuel mileage been since this started, any noticeable decrease if mpg...?

Can you cause it to happen by wiggling the coil wires and plug cables around..?

Have you had it scanned for codes..?

 

Please confirm you had the A.I.R. disabled in the PCM.

 

Haven't checked the plugs to see if any are loose, I'll do that this weekend. As far as gas mileage maybe a slight decrease. And yes I deleted the AIR when I did the dyno so the PCM reads it as nOt being there.

 

Maybe try the tune/diagnostics forum???