Backfiring problem

[jrengstorff]

I have a 3rd gen CMC 92 firebird with a 5 liter TPI motor. It came with straight exhaust, and was a bit loud. I installed a single chamber Delta muffler, and now it backfires when off-throttle.

 

Is there anything I can do to alleviate the backfiring? I'm afraid its going to blow the muffler off, or worse. As is, it sounds like a 12 gauge going off in every corner.

 

Thanks for any insight out there.

 

Jim

[Carson]

Hey Jim, must be a exhaust leak or maybe the muffler was installed backward ??

[jeffburch]

Maybe a leaking/stuck injector, or a bad/misadjusted throttle position sensor.

 

jb