[WolfMikeyy]

About two weeks ago I did a Full Throttle pull while logging MHD. After the pull, the car began to misfire badly and codes began to appear. While driving home it of course sounded like a tractor and would backfire once or twice extremely loud when coming to a stop or letting off the throttle. The original set of codes are in Code Section 1 + the log from literally a minute or less of this all starting.

I borrowed some n54 working coils to see and it felt better, but not 100% there. Still ran rougher but not as bad as day 1. I began to fear loss of compression on cyl5 so Got a tester from Oreilys and got these numbers

1: 180
2: 175
3: 180
4: 178
5: 180
6: 180

Did a compression test on that running n54 I borrowed the coils from and had the same values, just to make sure gauge was reading correct.

After that I figure it was coils/plugs so I bought all 6 of each and replaced them today. Still having the issues and car runs in that "better" state but a lot more codes now, still in the same field of what I was with before. These codes are in Section 2 + two logs from idle today and little throttle blips.

Listening to the injectors with a screwdriver they all sound to be firing but cylinder 5 is less "clicky" in sound. Not sure if that is because of the DME code saying it shut it off or what (weirdly the plug from cyl 5 will have fuel on it even with that code). It smells very fuel-ly when running today but after a couple start ups, the smoke stopped coming out the exhuast.

Please if any tips or where to look I will greatly appreciate it.

2013 F30 335i
93k~ miles
FBO
STG2+
XHP

Section 1: Original Codes after misfire started

DataZap Log: https://datazap.me/u/71percent/53120...og=0&data=3-18

Codes from Day 1 of issue

6/1/2022 12:54:04 AM
- DME active codes -
102A01 - Hot film air mass meter, signal: Electrical fault.
108001 - Intake air temperature sensor, electrical: Short circuit to B+.
108010 - Intake air temperaturè sensor, electrical: Signal not plausible.
140001 - Combustion misfires, several cylinders: Fuel injection is switched off.
140010 - Combustion misfires, several cylinders: detected.
140501 - Combustion misfire, cylinder 5: Fuel injection is switched off.
140510 - Combustion misfire, cylinder 5: detected.
1C4002 - Engine oil level: Too low.
- ME shadow (inactive) codes
108932 unknown
135704 - Valvetronic system: Warning threshold value, feedback control
deviation exceeded.
140011 - Misfire: Fuel injection deactivation.
1FB501 - Check Control message (ID 27): Engine oil level! Add engine oil.
231501 - Fault entry: Send buffer full.
- Transmission active codes -
None

——

6/1/2022 9:02:14 AM
- ME active codes
None
- DME shadow (inactive) codes -
11A401 - Fuel high pressure during fuel injection release: Pressure too low.
11B401 - Fuel high pressure or after enabling injection (2nd ambient
condition set after delay): Pressure too low.

Section 2: After Plug and Coil replacement

DataZap Log:https://datazap.me/u/71percent/61120...og=0&data=3-18

Codes from today after 6 new plugs and coils installed

6/11/2022 4:02:00 PM
- ME active codes -
108010 - Intake air temperature sensor, electrical: Signal not plausible.
111030 - Injection system, cylinder 1, rise in current: Too slow.
111031 - Injection system, cylinder 2, rise in current: Too slow.
111032 - Injection system, cylinder 3, rise in current: Too slow.
111033 - Injection system, cylinder 4, rise in current: Too slow.
111034 - Injector cylinder 5, current increase: Too slow.
111035 - Injector cylinder 6, current increase: Too slow.
140001 - Combustion misfires, several cylinders: Fuel injection is switched off.
140002 - Combustion misfires, several cylinders: Damaging exhaust gas after.
starting up.
140010 - Combustion misfires, several cylinders: detected.
140302 - Combustion misfire, cylinder 3: Damaging exhaust gas after starting
up.
140310 - Combustion misfire, cylinder 3: detected.
140501 - Combustion misfire, cylinder 5: Fuel injection is switched off.
140502 - Combustion misfire, cylinder 5: Damaging exhaust gas after starting
up.
140510 - Combustion misfire, cylinder 5: detected.
150102 - Ignition, cylinder 1: Combustion period too short.
• DME shadow (inactive) codes -
108932 unknown
140011 - Misfire: Fuel injection deactivation,
21A023 - Combustion engine: Unsuccessful start or engine stopped without
driver influence.
231501 - Fault entry: Send buffer full.
- Transmission active codes
None

[BMWILUVU]

I'd like to say you may have a badly leaking injector but those electrical problems give me pause. I would have those addressed by an expert before moving forward. Check around the engine bay for damaged wiring.

[thejeremyman9]

Did you try flashing back to stock tune?

[WolfMikeyy]

Just reflashed MHD stg2+ tune

[thejeremyman9]

Originally Posted by WolfMikeyy

Just reflashed MHD stg2+ tune

Try stock tune....