Exhaust doesn't crackle/ pop anymore ?

solo_the_lad · Post by **solo_the_lad** » Thu May 25, 2023 10:26 pm

I deleted the muffler from my z4 a while back, and with that alone it would make wonderful crackle and popping noises. But not too long ago it stopped doing it as much. I haven't modified the engine/ exhaust/ intake in any way since the muffler delete. Anyone have any idea on what it could be?

Pondrew · Post by **Pondrew** » Thu May 25, 2023 11:13 pm

Maybe it's all coked up from the unburnt fuel?

TOMGREEN413 · Post by **TOMGREEN413** » Thu May 25, 2023 11:21 pm

That's very strange, something has obviously changed , maybe the fuel mapping but it could be carbon build up.

Chris_D · Post by **Chris_D** » Thu May 25, 2023 11:23 pm

I think it's snapped somewhere.
Can you see what I did there?
snap, crackle, pop.
or rather snap, no crackle, no pop

solo_the_lad · Post by **solo_the_lad** » Thu May 25, 2023 11:37 pm

TOMGREEN413 wrote: ↑Thu May 25, 2023 11:21 pm That's very strange, something has obviously changed , maybe the fuel mapping but it could be carbon build up.

What do you mean by fuel mapping? As for carbon build up, it seems that would be unlikely since its only got about 76k miles on it, but I don't know much about carbon buildup so I suppose it is possible.

TOMGREEN413 · Post by **TOMGREEN413** » Sun May 28, 2023 12:22 am

solo_the_lad wrote: ↑Thu May 25, 2023 11:37 pm
TOMGREEN413 wrote: ↑Thu May 25, 2023 11:21 pm That's very strange, something has obviously changed , maybe the fuel mapping but it could be carbon build up.
What do you mean by fuel mapping? As for carbon build up, it seems that would be unlikely since its only got about 76k miles on it, but I don't know much about carbon buildup so I suppose it is possible.

What do l mean by fuel mapping.......too complicated to try n explain here, but Internet research will explain.

enuff_zed · Post by **enuff_zed** » Sun May 28, 2023 2:40 am

Is the engine running?

solo_the_lad · Post by **solo_the_lad** » Sun May 28, 2023 5:48 am

enuff_zed wrote: ↑Sun May 28, 2023 2:40 am Is the engine running?

not sure i'll start it again and listen closely to make sure

DMike · Post by **DMike** » Sun May 28, 2023 8:54 am

Don’t know if it’s really of any significance in your scenario, but I think on mine the engine and exhaust need to be pretty warmed up for audible burbles when lifting the pedal.

MikeyH · Post by **MikeyH** » Sun May 28, 2023 10:19 am

At least the neighbours will be happy

True-Blue · Post by **True-Blue** » Sun May 28, 2023 11:47 am

Have you had your hearing tested lately?….

Maybe the un-silenced exhaust has burst your eardrums

Pondrew · Post by **Pondrew** » Sun May 28, 2023 12:18 pm

True-Blue wrote: ↑Sun May 28, 2023 11:47 am Have you had your hearing tested lately?….

Maybe the un-silenced exhaust has burst your eardrums

Sorry could you repeat that?

solo_the_lad · Post by **solo_the_lad** » Sun May 28, 2023 5:21 pm

DMike wrote: ↑Sun May 28, 2023 8:54 am Don’t know if it’s really of any significance in your scenario, but I think on mine the engine and exhaust need to be pretty warmed up for audible burbles when lifting the pedal.

oi yes even after being properly warmed up it makes no difference

Mike6 · Post by **Mike6** » Mon May 29, 2023 5:09 pm

If you remove the exhaust padding then presumably that reduces back pressure. Could the ECU be sensing this and adjusting timing, fuel or whatever such that popping is reduced.

Pondrew · Post by **Pondrew** » Mon May 29, 2023 5:29 pm

Mike6 wrote: ↑Mon May 29, 2023 5:09 pm If you remove the exhaust padding then presumably that reduces back pressure. Could the ECU be sensing this and adjusting timing, fuel or whatever such that popping is reduced.

Also known as the ASRM (Anti Social Rectification Module).

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