Cylinder 4 combustion misfire

Bimmer_Bro · 02-10-2022, 12:01 PM

Quote:

Originally Posted by El-daybed

Quote:

Originally Posted by Bimmer_Bro

Oh shoot I'm not sure either. You could ask in the MHD look at my log thread.

Link?

MHD "take a look at my log" thread https://www.e90post.com/forums/showthread.php?t=1269588

El-daybed · 02-10-2022, 02:48 PM

Quote:

Originally Posted by Bimmer_Bro

MHD "take a look at my log" thread https://www.e90post.com/forums/showthread.php?t=1269588

So i was o at my stft on my way home from work and just normal highway driving leaving a stoplight my stft bank 2 went to 30 , I’ve also noticed oil coming from the PCV on the valve cover and the misfire has progressed to any time I start the car could a bad valve cover or pcv cause the misfire on startup ?

Saif2018 · 02-10-2022, 03:13 PM

Quote:

Originally Posted by El-daybed

So i was o at my stft on my way home from work and just normal highway driving leaving a stoplight my stft bank 2 went to 30 , I’ve also noticed oil coming from the PCV on the valve cover and the misfire has progressed to any time I start the car could a bad valve cover or pcv cause the misfire on startup ?

If there is oil leaking into the cylinder from cracked Valve cover possibly

El-daybed · 02-10-2022, 03:15 PM

Quote:

Originally Posted by Saif2018

If there is oil leaking into the cylinder from cracked Valve cover possibly

Could it be leaking from the inside? I cant see any oil leaking on the outside and i have checked , i have liqui moly and a black light

Saif2018 · 02-10-2022, 03:30 PM

Quote:

Originally Posted by El-daybed

Could it be leaking from the inside? I cant see any oil leaking on the outside and i have checked , i have liqui moly and a black light

You could pull the plugs and injectors to check.

El-daybed · 02-10-2022, 03:34 PM

Quote:

Originally Posted by Saif2018

You could pull the plugs and injectors to check.

I have done that many times , , is it possible that valve cover leaks internally like that..

Saif2018 · 02-10-2022, 03:53 PM

Quote:

Originally Posted by El-daybed

I have done that many times , , is it possible that valve cover leaks internally like that..

It's possible, you could remove the Valve cover and inspect it thoroughly.

Dave92N54 · 02-10-2022, 08:09 PM

If it started after injector install i'd be looking at a bad seal. As in either the injector seal did not seat properly or the head port ovaled out.

El-daybed · 02-10-2022, 08:17 PM

Quote:

Originally Posted by Dave92N54

If it started after injector install i'd be looking at a bad seal. As in either the injector seal did not seat properly or the head port ovaled out.

Replaced seal and decoupler yesterday had same suspicion as you swapped coils injectors and plugs as well and that does not explain why only on start up and why i can do a pull at 15 psi with no misfire, not even any timing corrections

El-daybed · 02-15-2022, 03:53 PM

https://*********************/graphs...0-46-22.15373/ Here is my datalog from a pull today ,maybe this can help tell me my issue?

02-10-2022, 08:09 PM	#30
Dave92N54 Major 534 Rep 1,173 Posts Drives: 09 E92 335i 6MT Join Date: Nov 2020 Location: Westminster, Maryland iTrader: (0) Garage List 2009 BMW 335i [10.00]	If it started after injector install i'd be looking at a bad seal. As in either the injector seal did not seat properly or the head port ovaled out. __________________ 09 E92 335i 6MT / Alpine White / Coral Red / VRSF 7.5" / VRSF DCI / VRSF Catless Downpipes / VTT Charge Pipe / Turbosmart RacePort Gen V / RB OEM Billet Turbos / CD919 Custom Tune / Bilstein PSS9s
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02-15-2022, 03:53 PM	#32
El-daybed Private 9 Rep 64 Posts Drives: 08 335xi Join Date: Nov 2021 Location: Colorado iTrader: (0)	https://*********************/graphs...0-46-22.15373/ Here is my datalog from a pull today ,maybe this can help tell me my issue?
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