N55 Lagging and jolting (help)

PalmN55 · 12-02-2023, 09:40 AM

Hoping to find someone one here that’s had a similar issue… (2016 M235i N55 tuned on BM3 and XHP)Thought I was experiencing an undetected misfire do to an obvious lag and lurch feel. Swapped plugs for 1-step colder ones, replaced ignition coils, map sensors on the charge pipe and manifold and did maf sensor… still same issue. Then my mind went to fueling, so I replaced the hpfp. No such luck. Only codes present is an active one for air mass too high and an inactive one for send buffer full will attach an image of the code screen. Has anyone had this before and what did you do to fix it?

jb-slow · 12-03-2023, 04:01 PM

Stop throwing money at it, you probably just have a intake leak somewhere. Do a smoke test or a pressure test an I bet you'll find the issue.

XutvJet · 12-05-2023, 11:03 AM

What are your power modifications?

12-02-2023, 09:40 AM	#1
PalmN55 Registered 3 Rep 2 Posts Drives: BMW M235i Join Date: Dec 2023 Location: Florida iTrader: (0) Garage List 2016 BMW M235i [0.00]	N55 Lagging and jolting (help) Hoping to find someone one here that’s had a similar issue… (2016 M235i N55 tuned on BM3 and XHP)Thought I was experiencing an undetected misfire do to an obvious lag and lurch feel. Swapped plugs for 1-step colder ones, replaced ignition coils, map sensors on the charge pipe and manifold and did maf sensor… still same issue. Then my mind went to fueling, so I replaced the hpfp. No such luck. Only codes present is an active one for air mass too high and an inactive one for send buffer full will attach an image of the code screen. Has anyone had this before and what did you do to fix it? Attached Images
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12-03-2023, 04:01 PM	#2
jb-slow First Lieutenant 111 Rep 338 Posts Drives: m235i Join Date: Mar 2019 Location: puyallup iTrader: (0)	Stop throwing money at it, you probably just have a intake leak somewhere. Do a smoke test or a pressure test an I bet you'll find the issue.
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12-05-2023, 11:03 AM	#3
XutvJet Major General 5556 Rep 5,372 Posts Drives: 2011 Cayman Base, 2016 M235 Join Date: Mar 2016 Location: Kansas City iTrader: (-1)	What are your power modifications? __________________ The forest was shrinking, but the Trees kept voting for the Axe, for the Axe was clever and convinced the Trees that because his handle was made of wood, he was one of them.
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