Exhaust sound

[zeeshankhn]

Hello guys,

Hope all is good.

Ok, about the exhaust sound, my car farts! Yes. Specially when im going uphill, usually over flyovers, I am at a constant speed, it farts. That is exactly how it sounds as well so I dont really have any other way to describe it. :) But its a deep sound. Like the stomach is really upset.
Anywho, the sound doesnt come when I accelerate going uphill.

Even when accelerating it keeping a very light foot on the accelerator, it does the same.

I know the sound itself or if someone would drive the car himself would have a better suggestion, but still, if anyone would have any clue as to why this is happening, please let me know. Would really appreciate it.

I havent been finding time to visit X service or any other garage but would do so as soon as I get time.

Thanks a lot in advance guys.
Cheers!

[Ayham]

Alright, is your exhaust aftermarket? How long has it been on the car? Decat?

My E36 does the same, but I call it backfiring cuz that's what it does when I left off...Gosh isn't it sinfully sweet! It's like "spitting" rather than "farting" really...I don't mind testing it for you sometime next week bro...

[Bisho]

make sure that the exhaust is stable 100% over all RPMs

[akanso]

:sorry: gents, but does any smell comes out????? :lol:

[The Caveman]

Interesting subject,bisho, how do you stabilize an axhaust?
I will leave it to the exhaust doctors!

[zeeshankhn]

No it doesnt smell akanso. Or atleast i wouldt know. Need to ask the driver behind :)
As far as i know it is not aftermarket. I bought it second hand.
Ayham, i dont think it is backfire. It really is a "fart" sound :).
I think another post which had mulitple queries included the same issue. So I guess i should go visit one of the garages there in Rashidiya?
Just needed a rough advise form you guys before i do. Just to know how much i would be looking at to get it fixed.
Thanks a lot guys.

[Bruno]

if it's a fart sound and it's that obvious then i assume you have a hole somewhere down the exhaust pipes. any exhaust shop can re-weld it once you detect it.

[Ayham]

Well, if it's there all the time, then you have a leak somewhere...

[Bashar M.]

Check your spark plugs and coils such sound is generated when the cylinder is not firing up and petrol is there..... its not ur exhuast mate :)

when the cylinder is not burning the petrol inside it effeciantly, ull hear a deep sound from ur exhuast like a heart beat or sth.

So I'd suggest checking ur coil pack and spark plugs since if they are old (failing) such sound appears before the hated hesitation :)

[zeeshankhn]

Hey thanks a lot guys.
However, i dont think it is the sparkplugs. I believe they were changed on my "honey-bees" (beige beemer :P) last visit to the garage.
There is one thing i forgot to mention earlier though.
The RPM decreases a little when the sound comes. Its only for a second but thats what happens. Going uphil, the sound comes and simaltaenously the RPM decreases a little.
Hope this would help in further advises.
Thanks a lot guys. Really appreciate the response im getting from this group.
Long live all!

[Ayham]

Well, that's an important piece of info....

It supports what Bashar suggested, it has to do with your ignition.

[Bruno]

can you post a vid?

[zeeshankhn]

OK. will do that. if i remember :P
So basically the video of the RPM right? OK.
Any recomended garage for this? Im looking for cheap :$

[Bashar M.]

change ur coils buddy :) if ur spark plugs are good....

[zeeshankhn]

Thanks for the info.
Any garage recommendations? Im looking for cheap over here *embarassed*
Ill try to put a video as well, if i remember that is, but it is exactly as im describing.
The sound is not constant. I mean its not there all the time. It only comes when i press on it a little. If i floor it, the sound is a normal 323i. Happens mostly when going uphill (easy foot on the pedal i guess). RPM decreases for a second. It happens on intervals. say after every 2 or 3 seconds, when goin uphill. Straight road no regular interval.

I think ive said too much :D
THanks a lot guys.!