N20 roughness

tellreded · 07-21-2018, 04:00 PM

Hey guys, my dad's 2013 320ix with the N20 motor is having some intermittent/persistent (on cold start) roughness with the engine. The rpms will drop for a second as if fuel/air/spark completely stops for a split second and it does that once or twice within 2 mins, all while idling a bit rough for the said 2 mins. Sometimes it will even kill the engine entirely. There are no DTCs and no MIL. I looked on ista+ and the only troubles are to do with unrelated troubles such as the FRM fault for the foot well light. I was thinking because it is within 2 minutes that it may be the secondary air system being clogged up not allowing exhaust to flow through, but I don't know if this car even has it. Only reason I think of it is because my 128i has it. Do you guys have any ideas of where to start looking? Because the dealership has no idea either. Any help would be appreciated. THANKS!

tellreded · 07-21-2018, 04:04 PM

Also, if you guys want me to get you any PID values, I can do that. For example, the fuel pressure at idle is about 1600 and while driving it's about 2600

07-21-2018, 04:00 PM	#1
tellreded New Member 3 Rep 23 Posts Drives: E82 N52 Join Date: Feb 2018 Location: Canada iTrader: (0)	N20 roughness Hey guys, my dad's 2013 320ix with the N20 motor is having some intermittent/persistent (on cold start) roughness with the engine. The rpms will drop for a second as if fuel/air/spark completely stops for a split second and it does that once or twice within 2 mins, all while idling a bit rough for the said 2 mins. Sometimes it will even kill the engine entirely. There are no DTCs and no MIL. I looked on ista+ and the only troubles are to do with unrelated troubles such as the FRM fault for the foot well light. I was thinking because it is within 2 minutes that it may be the secondary air system being clogged up not allowing exhaust to flow through, but I don't know if this car even has it. Only reason I think of it is because my 128i has it. Do you guys have any ideas of where to start looking? Because the dealership has no idea either. Any help would be appreciated. THANKS!
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07-21-2018, 04:04 PM	#2
tellreded New Member 3 Rep 23 Posts Drives: E82 N52 Join Date: Feb 2018 Location: Canada iTrader: (0)	Also, if you guys want me to get you any PID values, I can do that. For example, the fuel pressure at idle is about 1600 and while driving it's about 2600
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