[Nailbittr]

Hi, I have a 2016 f32 116k mileage with n55 engine no m sport, been keep on getting rough idling on car sometimes and than misfire on cyl 3+4 and engine/drivetrain would come on, my tech tried changing all new Oem injectors(all coded)/Bosch coils/oem spark plugs/ and ECM, but car would still start getting rough idles and than engine light and drivetrain, tried swapping spark plugs and coils around with other cylinders but it will still only show up on ista and obd readers as cyl 3 and 4, every time my tech resets ECM and clear codes, sometimes it would last a couple days to 1 week at max before happening again. but the problem only happens when car is idled for long period of time and not while driving, everything is perfectly fine when driving though and codes never come up, only when idling. this problem has been going on for several weeks right now, if anybody has ever came upon this situation/condition or might have a clue on what could possibly be causing this issue, please let me know, many thanks!!

[LA1Z24]

Compression test on 3 and 4

[Nailbittr]

Originally Posted by LA1Z24

Compression test on 3 and 4

Also tried compression test already, compared both cyl 3+4 that kept getting code to the other cylinders that were not, seems to be good, numbers all about the same

[LA1Z24]

without knowing what the numbers are, thats as good as not doing it.

[F32Fleet]

Originally Posted by Nailbittr

Hi, I have a 2016 f32 116k mileage with n55 engine no m sport, been keep on getting rough idling on car sometimes and than misfire on cyl 3+4 and engine/drivetrain would come on, my tech tried changing all new Oem injectors(all coded)/Bosch coils/oem spark plugs/ and ECM, but car would still start getting rough idles and than engine light and drivetrain, tried swapping spark plugs and coils around with other cylinders but it will still only show up on ista and obd readers as cyl 3 and 4, every time my tech resets ECM and clear codes, sometimes it would last a couple days to 1 week at max before happening again. but the problem only happens when car is idled for long period of time and not while driving, everything is perfectly fine when driving though and codes never come up, only when idling. this problem has been going on for several weeks right now, if anybody has ever came upon this situation/condition or might have a clue on what could possibly be causing this issue, please let me know, many thanks!!

Only thing left to test/inspect is the wiring for a short.