Backfiring

[P4t]

Hey, just wondering more often than not if i go past 4000rpm and change gear my car will blast out a nice backfire, is this normal / a problem?

[Mike__]

if you have a non recirculating bov then thats the cause.

[LatinR33]

Well is your car stock or boosted?? If its boosted then could be a number of things...

- spark plugs might need re gapping

- Your coils might have a crack, if you search there is a good silicon fix for this prob on the forums. of just go buy some splitfire coils.

And also if you have a atmo bov like the guy above said could be causing you probs, im putting my money its your coils or your sparks.