Bmw Serie 3 THAT have idling problems

Okay. Lots of possible causes for misfire — start with exhaust vanos solenoids. See any other codes.

Could be a vacuum leak, could be fuel pump/filter, spark plugs/coils. Maybe a faulty MAF sensor?

I’m not sure what fuel you guys run there, but that may have an impact if you’re running lower than 91 Octane.

05-19-2015, 08:21 AM #13
05-19-2015, 08:22 AM #14

Okay. Lots of possible causes for misfire — start with exhaust vanos solenoids. See any other codes.

Could be a vacuum leak, could be fuel pump/filter, spark plugs/coils. Maybe a faulty MAF sensor?

I’m not sure what fuel you guys run there, but that may have an impact if you’re running lower than 91 Octane.

05-19-2015, 08:26 AM #15
05-19-2015, 09:58 AM #16
05-19-2015, 08:36 PM #17

05-20-2015, 01:34 AM #18
05-21-2015, 08:57 PM #19

This happens occasionally with my 2013 328i.

Scenario:
Engine is cold, like in the morning leaving for work.
Usually the engine fires up right away, but sometimes it’s a bit slow to do so.
When it’s slow to do so, the idle is often low.
I can give it a bit of throttle to get the idle going.
When the idle is low, putting the AT into reverse can put enough load on the engine to make it stumble. A handful of times, it’s actually stalled.

This issue does not happen when starting the car with a warm engine.

One guess is the engine isn’t getting quite enough air.
There are various possibilities:
The ECU program has an issue somewhere.
The IACV (assuming the N20 has one. ) isn’t opening up enough at times.
The intake valves have carbon buildup on them due to the DI not cleaning them, blocking airflow some.

Another guess is the engine isn’t getting enough fuel.
Possibly low fuel pressure.
Or clogged injector.
Or the ECU again, not giving enough fuel.

No error light has ever shown up so it doesn’t appear to be a misfire.

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05-22-2015, 01:56 PM #20