10-14-2021, 01:35 PM | #1 |
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![]() Hi guys, I have recently purchased my first ever 6 Cylinder BMW and I have owned it for roughly over a month. This cold start issue has been happening since the start but it has recently stalled on me twice when trying to cold start. I have not touched anything during the cold start and the engine proceeded to stall. The revs raise to 1,2k then drop to around 300 (this is where it has started stalling sometimes) then suddenly raise again to around 2,1k then drop to 1,2k and the cold start works as it should. It is important to remember that no other issues exist or are apparent after the cold start and no errors are present when using BimmerLink to scan the car however, when using My BMW to request archived data about the car there was an error that led to the Throttle Position Sensor. I was wondering if anyone has an idea why this is happening or if they have solved this issue in the past. Thanks, Artur Last edited by ArturDwora; 10-14-2021 at 01:41 PM.. |
10-14-2021, 03:21 PM | #2 |
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It could be the throttle position sensor going out again. When I had mine, there was never any instance of that. Could yours have been tuned at some point?
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10-14-2021, 03:54 PM | #3 |
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how does it start and run when its warm ?
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10-14-2021, 04:00 PM | #4 |
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I have no idea if it was tuned but everything on this car is stock and its a super high spec from factory it also looks like it has been garaged most of its life. When checking the private plates that were on the car the people that have had it moved on to some pretty nice cars if they still have those private plates.
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10-14-2021, 04:01 PM | #5 |
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10-14-2021, 04:02 PM | #6 |
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I don't get this with my 2016 M235i - If I start the engine and don't engage, it'll go from around 1100 > 800 > 600, ±50 or so. It's garaged most of the time.
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10-14-2021, 04:25 PM | #7 | |
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![]() Some people have said that getting the car tuned and removing the cold start fixes it others had their fuel pump replaced with the recall had also some new software that fixed it apparently as well. ![]() I just don't fancy buying a fuel pump and then realising its a software issue. I will try logging the fuel pressures and see if they're within the norm when doing a cold start. One thing I didn't mention is that it only happens after the car has been parked overnight. |
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10-14-2021, 05:28 PM | #8 | |
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Super common issue and seems to be happening way more in the past year on N55 M235s, M2, and 3/4 series cars equipped with the MPPK tune. I wonder if fuel producers are using some new additive that the DME doesn't like on a cold start? Any way, as taken from my post in this thread: https://www.2addicts.com/forums/show...1143107&page=2
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10-14-2021, 07:23 PM | #9 | |
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10-14-2021, 07:41 PM | #10 |
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Sounds like a common issue. My previous car was a 2011 335ix (6MT N55) with the stage 2 BMW PPK. It used to do this most noticeably in the winter when it was really cold out. It rarely stalled though, and on the few occasions it did it started right up again no problem. Dealer did not find any codes that would indicate a problem so I just lived with it.
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10-14-2021, 09:05 PM | #11 |
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disconnecting the MAF puts the car into "Alpha N" tune. basically runs by a predetermined air/fuel table. I've had to do this on my M235i and my wife's 335i which doesn't have the MPPK tune. in my cases, it did correct the cold start stumble.
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10-15-2021, 08:24 AM | #12 | |
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BTW I have managed to get the car data again and I have these two faults apparently recorded however they do not show up on the OBD tool. |
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10-15-2021, 10:52 AM | #13 |
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what I've done is go out on a regular trip and when I come home park in the driveway and unplug the maf for 10 minutes without ever turning off the car.
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10-15-2021, 01:19 PM | #14 | |
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I will report back tomorrow on how the cold start went. Big thanks to everyone for being kind enough to help me out. ![]() |
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10-16-2021, 10:49 AM | #15 |
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Looks like you got all the answers, but since I took a video of the startup, here it is anyway:
This is a Sports Auto in [P] from cold, albeit as you can see the ambient temperature is quite mild. Looks like it runs 1200 ... 900 ...... 800 .. 700 Once it drops to 700 it stays there indefinitely. Fuel is Shell V-Power Unleaded 99 RON (US ≡ 93-94)
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10-17-2021, 08:29 PM | #16 | |
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08-01-2022, 02:37 PM | #17 |
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Just want to say thank you so much for this XutvJet my 50k mile 335 with the MPPK had started doing the same thing a few days ago for no rhyme or reason.
Followed your instructions and had a totally normal cold start this morning. I agree with you that it could possibly be a tuning glitch. Pulling the MAF seemed to do the trick. I can now relax. |
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08-27-2023, 05:57 PM | #18 |
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Just for added confirmation, my 2015 M135i was having the same issue when cold starting. It was getting so bad that it was nearly stalling 90% of the time when starting from cold but started normal when hot.
So, after commuting home, I turned off the engine and unplugged the MAF sensor, restarted the car and left it idling for 10 minutes. It might've been in my head but I straightaway thought the car felt more smooth at idle for those 10 minutes. I have now started the car when cold 3 times, and each time it has been faultless. No stutter, no drop in revs, a nice cold start sound from the exhaust ![]() Many thanks to who suggested the fix, really does seem to work! |
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08-12-2024, 10:46 PM | #19 | |
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Good evening, I would like to thank you for sharing this experience.
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