BMW 1-Series Forum (F20) 135i - 1Addicts.com > Second Generation 1 Series Forum > 2012 BMW 1-Series Sporthatch (F20) Discussion > M135i Exhaust Flap At Startup
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      07-11-2021, 11:02 AM   #1
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M135i Exhaust Flap At Startup

I have a 2013 M135i.

I must be the only person on the planet that wants my exhaust valve closed during startup. Everything I see when I google it is everyone wants theirs open.

Is there a way, Bimmercode?, to have the exhaust flap closed when the engine cold starts?

Thanks,
Richard
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      07-11-2021, 11:40 AM   #2
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https://f20.1addicts.com/forums/show...highlight=flap
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      07-11-2021, 11:56 AM   #3
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Thanks so much for the quick and great reply!!!
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      07-22-2021, 01:39 AM   #4
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Your exhaust valve is closed during a cold start, and this is not what makes the sound volume higher (no back pressure either)
It is an increase in speed and air injection so that your catalyst heats up faster that occurs, according to anti-pollution standards.
So the only way to avoid the "BMW cold start" is to encode the DME.
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      09-24-2021, 08:54 AM   #5
idemsisvoje
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I was also thinking about disabling it on my M140i, but I've seen a few people on FB forum having issues after they disabled the cold start procedure.
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      09-24-2021, 01:05 PM   #6
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Quote:
Originally Posted by F20_M135i View Post
Your exhaust valve is closed during a cold start, and this is not what makes the sound volume higher (no back pressure either)
It is an increase in speed and air injection so that your catalyst heats up faster that occurs, according to anti-pollution standards.
So the only way to avoid the "BMW cold start" is to encode the DME.
It wouldn't be so bad if it only did it on an actual cold start, but it does it on every single start hot or cold AFAIK.
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      09-24-2021, 01:45 PM   #7
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This is not normal and your DME may present a problem, because it is only from a certain temperature of the catalyst that the cold start order is sent.
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      09-25-2021, 10:35 AM   #8
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Quote:
Originally Posted by F20_M135i View Post
This is not normal and your DME may present a problem, because it is only from a certain temperature of the catalyst that the cold start order is sent.

Depends on what car you have, N55 will only do it on cold start, B58 will do it every start up regardless
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      09-25-2021, 06:59 PM   #9
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i done it , deactivated permanently fully open , unplug it and safety tied at the back of the bumper .

no faults or indications after that .
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