2013 F20 N54 135i Fueling/Hesitation/StartStop Issue

[chrissbull]

Hi All,

I’ve had my F20 135i for over 3 years now and in the last 6 months it’s been choking on engine start up WHEN WARM. Along with this more recently the Start/Stop has also stopped working when engine is up to temp which you would usually think should be the opposite/other way round? Along with this I had some “soft” hesitation on full throttle (soft meaning it doesn’t jerk or loose full power but you can feel its not completely smooth).

Then in the last few weeks it has gone into limp mode twice upon which i have then found a vacuum leak and changed the intake pipe & valve cover gasket vent hose which fixed the issue.

The issue is I am still experiencing “soft” hesitation on hard acceleration/full throttle along with start stop not working when engine is warm.

For reference in the last 6 weeks i have changed:
Coil Packs x6
Plugs x6
Air Intake & Valve Cover Gasket Vent Hose
Low pressure fuel Pump

And still the attached codes now show:



Thank you all in advance for any help