Pops and bangs

[JumboBeef]

Why does my 400 pop and bang on deceleration so much. I mean, I love it but what can I say to people who ask why it is "backfiring"?

[JumboBeef]

V8 Fettler said:

Flapper pops and bangs are due - in part - to the lack of road speed info being communicated with the ECU, hence fuelling continues on the overrun (ECU "thinks" car is at rest and idling, therefore needs fuel), IMO.

Thanks.

So while it sounds good, it's isn't really a good thing......?

[JumboBeef]

ed_crouch said:

A rich mixture. i.e. raw fuel in the exhaust header will cause a f***ing great bang periodically as the mixture reaches both a flammable stoichiometry and autoignition temperature.

A classic "backfire"?