Need some 135 diagnosis help

lleff · 10-05-2019, 05:12 PM

OK gurus... something went wrong with my cobb tuned 135 today. It's a 2010 6 speed. I was enjoying my favorite on-ramp followed by a hard but brief acceleration run when suddenly the service engine soon light/alarm came on and I the car began running rough and down on power. I limped it home. Symptoms:
- Smells like unburned fuel
- Seems to be consistently misfiring everywhere - idle, light acceleration
- Backfiring on deceleration

I pulled the codes and multiple cylinder misfires (P0305, 304, 302). Car has 62k miles on it.

Any guesses? Thanks!

Afam28 · 10-05-2019, 07:41 PM

Sounds like new spark plugs and coil plugs need to be ordered...
I would move around the coils to confirm...
Also, I'm not a guru, someone better should chime in soon!

chris_flies · 10-05-2019, 07:48 PM

Check your charge pipe, they like to explode.

lleff · 10-05-2019, 08:07 PM

Would the charge pipe throw the misfire codes?

dtla1 · 10-07-2019, 11:35 AM

Could also be a HPFP. Keep an Eye out for 2C01(High-Pressure Fuel, Pressure too low) or 2BE9(Cylinder injection shutdown, pressure too low)

Chainlightning · 10-07-2019, 10:59 PM

My car did the same thing under the same circumstances earlier this year. Charge pipe. The Dealer said plugs and coils too, but I was out of warranty so I am not sure about those. I kept the coils.

10-05-2019, 05:12 PM	#1
lleff New Member 1 Rep 29 Posts Drives: Non-BMW Join Date: Apr 2014 Location: Boston, MA iTrader: (0)	Need some 135 diagnosis help OK gurus... something went wrong with my cobb tuned 135 today. It's a 2010 6 speed. I was enjoying my favorite on-ramp followed by a hard but brief acceleration run when suddenly the service engine soon light/alarm came on and I the car began running rough and down on power. I limped it home. Symptoms: - Smells like unburned fuel - Seems to be consistently misfiring everywhere - idle, light acceleration - Backfiring on deceleration I pulled the codes and multiple cylinder misfires (P0305, 304, 302). Car has 62k miles on it. Any guesses? Thanks! Last edited by lleff; 10-05-2019 at 05:41 PM..
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10-05-2019, 07:41 PM	#2
Afam28 User 298 Rep 775 Posts Drives: 2008 BMW 135i M-sport Join Date: Apr 2018 Location: MD. iTrader: (1)	Sounds like new spark plugs and coil plugs need to be ordered... I would move around the coils to confirm... Also, I'm not a guru, someone better should chime in soon!
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10-05-2019, 07:48 PM	#3
chris_flies Sideways and Smiling 3027 Rep 2,860 Posts Drives: In Exuberance Join Date: Mar 2017 Location: Rosamond, CA USA iTrader: (0) Garage List 2012 BMW E91 328i [0.00]	Check your charge pipe, they like to explode. __________________ 2012 BMW 328i 6-Speed Wagon \| Deep Sea Blue with Grey Dakota Leather \| Manual Swap, 330i Intake + Tune, 3.15 Helical LSD, Öhlins R&T (SOLD) 2009 BMW 128i 6-Speed Coupé \| Monaco Blue with Black Sensatec \| chris_flies' 128i thread
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10-05-2019, 08:07 PM	#4
lleff New Member 1 Rep 29 Posts Drives: Non-BMW Join Date: Apr 2014 Location: Boston, MA iTrader: (0)	Would the charge pipe throw the misfire codes?
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10-07-2019, 11:35 AM	#5
dtla1 Colonel 828 Rep 2,232 Posts Drives: 2011 135i, Space Grey Join Date: Apr 2014 Location: Silicon Valley iTrader: (2)	Could also be a HPFP. Keep an Eye out for 2C01(High-Pressure Fuel, Pressure too low) or 2BE9(Cylinder injection shutdown, pressure too low)
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10-07-2019, 10:59 PM	#6
Chainlightning New Member 3 Rep 11 Posts Drives: 2013 135is Diamond Black Join Date: Jun 2015 Location: 46038 iTrader: (0)	My car did the same thing under the same circumstances earlier this year. Charge pipe. The Dealer said plugs and coils too, but I was out of warranty so I am not sure about those. I kept the coils.
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