I have custom ecu tune on my 3000 miles old 2011 335is. After I got the tune, I sometimes received engine malfunction reduced power message during cold start when outside temperature is cold. Engine malfunction code disappeared automatically after a second or so but it left 2f0c shadow code.
After I got flashed with revised file, I no longer get engine malfunction light, but engine sometimes takes longer to start during cold start. It never happens when engine is warm.
Here is the video showing cold start hesitation.
I am going to contact tuner after holiday, but I am wondering if tune file can actually cause this engine start hesitation issue. It happened on the next morning right after I got car flashed with revised file. Hesitation never happened with stock tune and first tune file with engine malfunction problem.
Or am I actually experiencing physical hardware issue (hpfp)?
Other than cold start hesitation, everything else seems to work fine.