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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F30 Sedan / F32 Coupe / F36 Gran Coupe Forum > 435i gran coupe exhaust not working??
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      01-29-2016, 11:04 PM   #1
npark
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435i gran coupe exhaust not working??

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Hi, I have 2015 435i gran coupe and i recently noticed that my dual exhaust (stock, m package model) is not working properly. smoke only comes out of the right side of exhaust pipe, and when i place my hand on to the end of left exhaust, i don't feel anything when i start up the car (cold start).

Is this normal? or is it something serious and i need to take it to service centre?

Please if anyone knows anything about this. please tell me.

currently I'm living in canada which has cold winter.
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      01-29-2016, 11:32 PM   #2
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when you start the car up initially both exhaust flaps will be open. after a minute or two you will hear the left exhaust flap close.
it will only open again i believe when you reeally open up the throttle
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      01-29-2016, 11:53 PM   #3
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Its completely normal. After the engine warms up, you can put it in sport mode and hear the exhaust flap open up
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      01-30-2016, 12:46 AM   #4
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Quote:
Originally Posted by Danguy426 View Post
when you start the car up initially both exhaust flaps will be open. after a minute or two you will hear the left exhaust flap close.
it will only open again i believe when you reeally open up the throttle
But as i turn the engine on and as soon as i run back of my car and place my hand over the left exhaust i don't feel or see anything while right one i can see the smoke and feel. Am i just too sensitive??
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      01-30-2016, 12:47 AM   #5
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Quote:
Originally Posted by Sheharyar_rr View Post
Its completely normal. After the engine warms up, you can put it in sport mode and hear the exhaust flap open up
Ill definitely check again giving it few days. Thanks for the reply!
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      01-30-2016, 12:54 AM   #6
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Quote:
Originally Posted by Sheharyar_rr View Post
Its completely normal. After the engine warms up, you can put it in sport mode and hear the exhaust flap open up
wait. so if we are in comfort mode, does the car only lets 1 side of exhaust do the job while sport mode opens the flap for both exhaust??
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      01-30-2016, 01:41 AM   #7
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There are a lot of variables and also depending on your selected mode and the operating condition, the computer decides when to use only one or both...

Dont you worry, everything is normal.

Just enjoy your car.

And yes you are too sensitive,

Welcome and Congrats.

PS: this question has been asked so many times already, we recognize all BMW noobs by it.
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      01-30-2016, 05:03 AM   #8
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It's a prank, there must be a potato in the other pipe!
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      01-30-2016, 08:44 AM   #9
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Can we make a sticky for this question. There is a new thread about it literally every other day.

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      01-30-2016, 09:25 AM   #10
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Quote:
Originally Posted by npark View Post
Hi, I have 2015 435i gran coupe and i recently noticed that my dual exhaust (stock, m package model) is not working properly. smoke only comes out of the right side of exhaust pipe, and when i place my hand on to the end of left exhaust, i don't feel anything when i start up the car (cold start).

Is this normal? or is it something serious and i need to take it to service centre?

Please if anyone knows anything about this. please tell me.

currently I'm living in canada which has cold winter.
I have asked same question before and here is the thread:

http://f30.bimmerpost.com/forums/sho....php?t=1217585
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      01-30-2016, 03:49 PM   #11
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Quote:
Originally Posted by venom4065 View Post
I have asked same question before and here is the thread:

http://f30.bimmerpost.com/forums/sho....php?t=1217585
You and a 1/4 of everyone else who joins this forum.
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      01-30-2016, 04:33 PM   #12
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Quote:
Originally Posted by smithf32 View Post
Can we make a sticky for this question. There is a new thread about it literally every other day.

Dackelone
And please make one for the "How to sync the ac temperature"
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      01-31-2016, 02:48 AM   #13
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Quote:
Originally Posted by M47 View Post
And please make one for the "How to sync the ac temperature"
Link ?
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      01-31-2016, 05:32 AM   #14
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Don't worry,This is the 435I GRAN COUPE unique valve logic.435i GRAN COUPE either "sport" or "sport plus" , place the valve is closed,When you keep moving state, and the engine speed to break through 2700, the valve opens.
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      05-15-2019, 09:50 PM   #15
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Quote:
Originally Posted by Sheharyar_rr View Post
Its completely normal. After the engine warms up, you can put it in sport mode and hear the exhaust flap open up
I have 435i and i changed the muffler to the M muffler. But it doesn't open when i put it to sport mode ? I don't see it open even in cold start, what do you think?
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      05-16-2019, 08:32 AM   #16
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Quote:
Originally Posted by smithf80 View Post
Can we make a sticky for this question. There is a new thread about it literally every other day.
There already is one.





podman
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      05-16-2019, 11:38 AM   #17
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Lmao isnít there a sticky thread on this exact topic?

Edit: Whoops should have read other post before commenting lol.
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      05-16-2019, 11:42 AM   #18
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sigh, BMWs had the exhaust valve for 13 years now... people still don't know. Can you just look at the 5th sticky note in this forum ?

This one: https://f30.bimmerpost.com/forums/sh....php?t=1220699
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