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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 > Before you ask why your exhaust is broken and why only one side is dirty: READ THIS!
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      03-06-2019, 10:38 PM   #89
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Quote:
Originally Posted by smithf80 View Post

It is completely normal for exhaust gas to come out of only one of your two exhaust tips, and for only one to look dirty most of the time.

The behavior may be normal under given circumstances, but what the circumstances are caused by may not be.

I thought this was normal for awhile after seeing this post, but turns out my engine oil has gone REALLY bad due to it running short distances in cold weather without enough time for the oil to warm up and caused it to get really thick.

if your oil temp gauge hasn't moved up at least a quarter after 15 mins of driving in cold (-20C or below) or one of your exhaust is still cold after a 15 min trip then get it checked.
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      03-07-2019, 01:36 AM   #90
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some cars have an update where the flap will not open after some time when doing cold start. for the x40i models
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      04-09-2019, 12:23 PM   #91
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FYI with MPPSK installed, you do not have this problem.
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      06-11-2019, 09:52 PM   #92
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Quote:
Originally Posted by F30ZHP View Post
FYI with MPPSK installed, you do not have this problem.
I have MPPSK installed and while the left pipe with exhaust flap opens in Sport modes (once the engine is warm), it does not in Comfort and Eco modes unless one accelerates hard. I use Carly for BMW Pro, and open the flap in Comfort mode once the engine is warm. I mainly do freeway driving, and so having the flap open helps with power and efficiency. Both exhaust tips are therefore the same colour.
Closed: Open:
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Last edited by DrGadget; 06-11-2019 at 10:00 PM..
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      06-11-2019, 11:40 PM   #93
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Quote:
Originally Posted by DrGadget View Post
I have MPPSK installed and while the left pipe with exhaust flap opens in Sport modes (once the engine is warm), it does not in Comfort and Eco modes unless one accelerates hard. I use Carly for BMW Pro, and open the flap in Comfort mode once the engine is warm. I mainly do freeway driving, and so having the flap open helps with power and efficiency. Both exhaust tips are therefore the same colour.
Closed: Open:
Interesting. Both my tips are the exact same color and my car is stock.
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      06-15-2019, 09:54 PM   #94
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Quote:
Originally Posted by F30ZHP View Post
Interesting. Both my tips are the exact same color and my car is stock.
Ah yes ... but the small production run (100 of them) ZHP model has the following as standard, and you may drive it mostly in Sport modes.
•Black Kidney Grills
•Carbon Fiber Mirror Caps
•Carbon Fiber Rear spoiler
•M performance power kit
•M performance exhaust
•Limited slip differential (lsd)
•Rear diffuser
All ZHP are RWD (75 manual 25 automatic)
Only 100 produced
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      07-20-2019, 02:25 AM   #95
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good info
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      07-24-2019, 04:19 AM   #96
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      07-24-2019, 10:59 AM   #97
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So what is the secret to get the exhaust valve to stay open on f36 models?
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      07-25-2019, 10:49 AM   #98
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great
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      08-02-2019, 11:42 PM   #99
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Quote:
Originally Posted by jack10525 View Post
So what is the secret to get the exhaust valve to stay open on f36 models?
See the response here:
https://f30.bimmerpost.com/forums/sh...6&postcount=35

If you have Parking Assistant, do not fall for the suggestion to remove fuses 146 and 147 in the trunk as PA will be disabled ... but yes, the flap will stay open. Pulling the flap actuator plug will keep the flap open, but another person posted that after 24 hours the ECU disabled the actuator, requiring $ervice centre intervention. Others have written about using a JB4.

Over to you .....
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      09-27-2019, 01:20 PM   #100
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Hi guys. I want to ask you a question. I have a 340i with the akrapovic exhaust system. A friend of mine has a 328 2012. He asked me to give him my stock exhaust. We made a quick experiment. We placed (not installed) the 340 muffler and connected only the actuator. He put sport + but the valve didn't open. I believe that without the gas pressure it can't open but I am not sure. What do you think?
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      09-29-2019, 11:46 PM   #101
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my 330 has stock black exhaust so I can't see any dirty
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      09-30-2019, 07:55 AM   #102
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Quote:
Originally Posted by Nikopoup View Post
Hi guys. I want to ask you a question. I have a 340i with the akrapovic exhaust system. A friend of mine has a 328 2012. He asked me to give him my stock exhaust. We made a quick experiment. We placed (not installed) the 340 muffler and connected only the actuator. He put sport + but the valve didn't open. I believe that without the gas pressure it can't open but I am not sure. What do you think?
It's electronic, it doesn't need any pressure, however, some people have reported that the valve doesn't open without a slight tap of the throttle.
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      10-05-2019, 12:16 AM   #103
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Quote:
Originally Posted by otay View Post
This is great. Maybe this sticky should be expanded / modified to include all FAQs for noobs?

- Exhaust on one side
- No temperature sync button
- Whirring noise when opening car door (fuel pump priming, i believe)
- What happens if I use regular gas

What else?
haha a noob like mew to this forum could use all the help he can get!
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      10-05-2019, 12:18 AM   #104
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yess! this is helpful!
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      01-31-2020, 11:02 PM   #105
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Quote:
Originally Posted by smithf80 View Post
This question comes up all of the time, so I have asked a moderator, Dackelone, to sticky this so it can be at the top of the forum for everyone to see, although I'm sure this won't stop people from asking still.

It is completely normal for exhaust gas to come out of only one of your two exhaust tips, and for only one to look dirty most of the time.


This is because the exhaust on our cars is valved, meaning it has a "flap" inside one of the pipes, and can be controlled electronically by the car for various reasons. In most cases, the flap will be closed, and this is the default setting for both Eco Pro and Comfort mode, this is why you see one tip clean and one tip dirty. In Sport and Sport+, it is open.

Here is a summary of the function of the flap (to my best knowledge):
  • Flap closed on startup to help warm up the cat's faster.
  • Flap will open itself when the car reaches idle, and will typically open itself when the car is idling.
  • After driving away in either Comfort or Eco Pro, the flap will close, and remain closed unless you give the car hard throttle.
  • The flap will remain open in Sport and Sport+ mode.

If you car doesn't do what I described to the T, don't worry, it doesn't mean somethings wrong, the car's computer is very smart, and only under certain conditions will that flap open itself, so if you go out and start your car and it happens to be open, don't worry, maybe your cars already warm, etc, etc.

Hopefully this thread will help put to rest all of the questions about this function so we can all get back to complaining about other small, unimportant things.
Great explanation
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      02-04-2020, 02:50 PM   #106
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I have the 320i and i saw on my maps config (BM3), a setting for the flap, i still don't know if this has one or if it did anything, but the option was there in the config..
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      02-16-2020, 04:53 AM   #107
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To open exhaust flap.

Quote:
Originally Posted by Tim2189 View Post
Alright guys I am going crazy here
just picked up a 2016 435xi gran coupe and this damn flap will not open!
cold start, idle, sport, sport +
It only opens after 3k during driving

I am trying to get it to open while im not driving so I can disconnect the wire and leave it always open.
on my previous 2015 X6 it was simple, once you start the car, the flap opens and closes testing itself and thats when I was able to disconnect it. It seems this car is different even though the flap and connector are exactly the same.

suggestions on how to open the flap while parked?
Start the car. Warm it up . Switch to sport mode, drive. Flap will open. Get out unplug flap power clip. You’re set it’ll stay open until you replug it. Enjoy!
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