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Old 12-17-2013, 01:27 PM
snowboardjoe snowboardjoe is offline
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Location: Seattle, WA
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Mein Auto: 2013 X3 28i
2013 28i very rough idle after start on cold mornings

We've been having some inconsistent cold starting on cold mornings here in Seattle. By cold I'm referring to temperatures below +40F. About 20% of the time after starting the engine will run VERY rough and sometimes to the point that it stalls. On restart it fires up immediately. On other morning it starts up and idles smooth.

One particular morning a few week ago, by husband started the car, it struggled through another rough idle and the car shutdown with an error messages on the NAV screen. In this case the engine shutdown, a cryptic error code was displayed (the words "fatal error" was part of that message) and the car was completely unresponsive for at least one full minute (pressing start/stop button had no effect and no lights anywhere). After this one minute period, the car was able to start again and ran fine.

Finally got it into the dealership yesterday morning. No code was registered by the computer. They were keeping it overnight to see if they could replicate the rough idle in the morning, but seriously doubt that will happen.

Anyone else run into this problem and find a resolution?

I'm going to have Ian make sure his cell phone is ready to take a video on the next really cold morning to try and capture this.
Joe Morris
2014 328xi GT (prem, tech, cold, conv, Msport)
2013 X3 28i (prem, tech, cold1&2, conv, hud) - Died Mar 2017
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Old 12-17-2013, 05:14 PM
Want the Thrill Want the Thrill is offline
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Old 12-17-2013, 07:23 PM
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lbjgh lbjgh is offline
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Mein Auto: 2013 X3 M-Sport
My car has a funky idle in colder weather, I.e. -15-20c idle smooths out after about 45 seconds.
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Old 01-12-2014, 03:42 AM
Flaxamax Flaxamax is offline
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Location: South Carolina
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Mein Auto: 2014 328i
It's that N20 motor. It behaves almost like a diesel when it's cold out and before it warms up.

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Old 01-12-2014, 08:06 AM
Masterx5 Masterx5 is offline
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Mein Auto: 2011 x3 3.5i
if no code registered then perhaps no HPFP issue. In my case it had registered the error and they tried to replicate it next morning. In my case i would need just take a second or 2 longer to cranks on somedays usually mornings but it happened one evening too. I thought it might be a battery issue. anyways it was HPFP issue
After HPFP replace one morning I had a rough start and it looked like it would stall but it did not. Dealership did not see any code registered. Has not happened again though it has been quite cold here
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