Hello!

I have an 08 535i 6MT with some mods. For the past few months my car has randomly stalled while accelerating in second or third gear, suddenly lost power and then the engine begins to exhibit a surging idle between 1000-1500rpm. The dash lights up and I'm stuck with 10% normal power. I drive the car everyday, and I'd say the car exhibits this issue once every 12 days or so. Other than that, the car behaves normally.

Relevant data:
-Dealership scanned the codes and first thought it was an electrical problem, but battery is functioning 100%
-Dealership now blames my JB4 tune even though the car has stalled in both Map 0 and Map 5 (only two I really use)
-Relevant maintenance done within past 20k miles:

• Both turbos replaced
• HPFP replaced
• Oil filter housing replaced
• Turbo Vacuum lines replaced

Dash lights:


Please note that:
-I DO NOT have reduced power message

Video of the surging (after engine stalls):

BMW 535i N54 SURGING IDLE


Attached are some logging I did as well. Please note the car did not stall or exhibit any issues during these logs.
















Sorry for the information overload, but the dealer doesn't even know what's going on. Thanks guys!

 

Too much info to even comprehend?