Exhaust Noise

[z|gen]

hey guys
removed my rear muffler today to see what the car sounds like and put a new pipe in,
but now when i decelarate i get a kind of backfire or popping noise..any ideas on what this is and how to fix it ?

cheers David

[TruenoBoy]

Um wel lto fix it put the old muffler back on.

Why would you want to fix it tho

[JT]

hey guys
removed my rear muffler today to see what the car sounds like and put a new pipe in,
but now when i decelarate i get a kind of backfire or popping noise..any ideas on what this is and how to fix it ?

cheers David

It has probably always been backfiring but now you can actually hear it.

[z|gen]

yes..well..the first cylinder is losing compression, so would that be a reason..i prob should pay more attention when listening to the techs at work..

[Wildcard]

yes..well..the first cylinder is losing compression, so would that be a reason..i prob should pay more attention when listening to the techs at work..

?

This would normally be a leak in the exhaust letting air into the mixture and helping ignite the unburnt fuel.

[z|gen]

hmm..im confused .. what is the most likely reason and easiest way to fix it..since there are no error codes for this, how could i find out what the problem is without having to rip the exhaust off etc ?

[Wildcard]

hmm..im confused .. what is the most likely reason and easiest way to fix it..since there are no error codes for this, how could i find out what the problem is without having to rip the exhaust off etc ?

Likely reason = exhaust leak.... either a flange isn't meeting up correctly letting air in or there is physically a hole somewhere in the piping.
The other possibility as suggested above is that with your new free flowing exhaust you just hear the natural post combustion detonation easier.

Its not really a big deal - it won't do much except possibly let a little bit of CO2 etc out before the exhaust tip and you'd fail a WOF if they noticed.

[z|gen]

yes..im aware id most likely fail a wof..which is why im just trialing without the rear muffler..has a coby up front which i wanted to hear..but now iv got a sorta of backfire noise..
thanx for the advice..il take a look under the car tmrw and see what i can find

cheers David

[PumpN]

yeap, it'll do that when you only have half an exhaust

my old mazda did the same when i got a mighty coby put in to replace a perfectly good baffled silencer, when you down shifted you got a mighty mighty WOOOOOooom bom bom boom (when you accelerated you got a cloud of blue smoke), that car was a beast, only when your 15/16 do you mod your cars that hardcore, and it was hardcore

they will backfire on the overrun, its worse with too big diameter exhausts, all carby cars seem to do it

[z|gen]

meh..stuck the old muffler back on..got a green sticker on the way to tech today..