N55 Misfire and possible boost leak help

CudiSTYL · 05-14-2020, 10:01 AM

Hello , I've been having really rough cold starts every morning with my car and regularly cuts out after trying to drive off if I don't give it a lot of gas (only in the morning when still cold). I've looked up the codes I'm having and I've been getting lots of mixed answers with either HPFP, Coils , plugs , and injectors . Plugs were recently done w/ N20 gapped @ .022. I have some logs that I took of the car a couple days ago but I've got not a single clue in how to read it.

Car is FBO 2011 E92 N55 on MHD Stg2+ W/ VRSF 7.5" intercooler , VRSF catless downpipe , BMS intake , and CPE Chargepipe

Codes:

2EE2 - combustion misfire, several cylinders: damaging exhaust gas after start sequence

2EEC - combustion misfire cylinder 3: damaging exhaust gas after start sequence

2EFE - misfire several cylinders: damaging to catalytic converters or damaging exhaust gas

2F01 - misfire, cylinder 3 : damaging to catalytic converters or damaging exhaust gas

I've also noticed a whist sound when accelerating at low RPMs in high gear. Car has done that since I've bought it 2 years ago and always assumed it was normal until someone pointed it out to me and noticed I wasn't reaching peak boost through MHD monitors (max boost hit has been ~17 PSI under hard acceleration) possible diverter valve ??

Any help at all would be greatly appreciated ! Thanks

https://datazap.me/u/cudistyl/mhd-pu...2-3-7-12-35-41

CudiSTYL · 05-23-2020, 11:17 PM

.

savvyy · 04-19-2023, 03:13 PM

Hello , did you ever figure out the problem ? I have a lot of the same codes and problems and I can’t seem to find out the problem !?

BerkshireBimmer · 05-05-2023, 09:59 AM

Subscribed. I have some similar symptoms and codes as well.

BerkshireBimmer · 05-22-2023, 09:28 AM

Just wanted to follow up if OP figured out the problem?

My issue went away after changing the spark plugs. I did them 45K miles ago. I guess that isn't bad.

The last set of plugs were Bosch. My mechanic recommended that I replace with OEM BMW plugs. This solved my problem. My car is bone stock.

Correct me if I'm wrong, the OEM plugs are made by Bosch. From what I understand there could be different quality control standards between OE and OEM. I've also heard that there could be counterfeit issues with some spark plugs.

05-14-2020, 10:01 AM	#1
CudiSTYL New Member 0 Rep 9 Posts Drives: BMW E92 N55 Join Date: Apr 2019 Location: Canada iTrader: (0)	N55 Misfire and possible boost leak help Hello , I've been having really rough cold starts every morning with my car and regularly cuts out after trying to drive off if I don't give it a lot of gas (only in the morning when still cold). I've looked up the codes I'm having and I've been getting lots of mixed answers with either HPFP, Coils , plugs , and injectors . Plugs were recently done w/ N20 gapped @ .022. I have some logs that I took of the car a couple days ago but I've got not a single clue in how to read it. Car is FBO 2011 E92 N55 on MHD Stg2+ W/ VRSF 7.5" intercooler , VRSF catless downpipe , BMS intake , and CPE Chargepipe Codes: 2EE2 - combustion misfire, several cylinders: damaging exhaust gas after start sequence 2EEC - combustion misfire cylinder 3: damaging exhaust gas after start sequence 2EFE - misfire several cylinders: damaging to catalytic converters or damaging exhaust gas 2F01 - misfire, cylinder 3 : damaging to catalytic converters or damaging exhaust gas I've also noticed a whist sound when accelerating at low RPMs in high gear. Car has done that since I've bought it 2 years ago and always assumed it was normal until someone pointed it out to me and noticed I wasn't reaching peak boost through MHD monitors (max boost hit has been ~17 PSI under hard acceleration) possible diverter valve ?? Any help at all would be greatly appreciated ! Thanks https://datazap.me/u/cudistyl/mhd-pu...2-3-7-12-35-41 Attached Images
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05-23-2020, 11:17 PM	#2
CudiSTYL New Member 0 Rep 9 Posts Drives: BMW E92 N55 Join Date: Apr 2019 Location: Canada iTrader: (0)	.
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04-19-2023, 03:13 PM	#3
savvyy Registered 0 Rep 1 Posts Drives: BMW 335I Join Date: Apr 2023 Location: California iTrader: (0)	Hello , did you ever figure out the problem ? I have a lot of the same codes and problems and I can’t seem to find out the problem !?
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05-05-2023, 09:59 AM	#4
BerkshireBimmer New Member 2 Rep 7 Posts Drives: BMW E90 335I Join Date: Apr 2023 Location: NEW ENGLAND iTrader: (0)	Subscribed. I have some similar symptoms and codes as well.
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05-22-2023, 09:28 AM	#5
BerkshireBimmer New Member 2 Rep 7 Posts Drives: BMW E90 335I Join Date: Apr 2023 Location: NEW ENGLAND iTrader: (0)	Just wanted to follow up if OP figured out the problem? My issue went away after changing the spark plugs. I did them 45K miles ago. I guess that isn't bad. The last set of plugs were Bosch. My mechanic recommended that I replace with OEM BMW plugs. This solved my problem. My car is bone stock. Correct me if I'm wrong, the OEM plugs are made by Bosch. From what I understand there could be different quality control standards between OE and OEM. I've also heard that there could be counterfeit issues with some spark plugs.
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