afterfire or backfire?

Originally Posted by gleonard

I recently had an aftermarket CBE installed (less than 30 days ago) and have recently noticed a muffled backfire/afterfire upon deceleration. I never hear it when I am hitting the throttle, and usually hear it when I let up on the gas to shift gears.

Is this caused by an exhaust leak? is the car running to rich? Is this normal, does anyone else have the same sound?

I contacted the company who I bought the exhaust from (they also did the install) but I haven't heard back from them yet. It's been a few days so I thought I would try to get an opinion from the experts on the forum.

Any help would be greatly appreciated.

Originally Posted by kannibul

As far as I understand it, it's a backpressure pop. Most cars do it, just some you never hear it until you have the kind of exhaust that makes it audible.