Misfire same cylinder changed everything

f87king · 07-01-2017, 04:30 PM

I'm not one to ask stupid questions but I've searched every forum and done everything to diagnose my misfire. I changed my valce cover gasket plugs coils and have index 12 injectors and I have a constant misfire 1. I have moved plugs replaced coils moved injectors everything still same cylinder misfire. Has anyone experienced misfires in one cylinder that is not related to coils, plugs, injectors and was something else? I want to get this sorted out I just paid for a custom tune and can't even use it

My car was running perfect b4 the VCG new coils and plugs now misfire if I step on it but if I ease into it no misfire. I did a compression test and the numbers were good.

LGCubana · 07-01-2017, 04:59 PM

Worst case scenario would be the DME.

Happened to a friend recently, with an '08, with >120K miles

NoQuarter · 07-01-2017, 05:16 PM

Who coded for the injectors? Can you verify the Values?

f87king · 07-01-2017, 05:17 PM

Quote:

Originally Posted by NoQuarter

Who coded for the injectors? Can you verify the Values?

Quote:

Originally Posted by NoQuarter

Who coded for the injectors? Can you verify the Values?

the injectors were replaced 30k miles ago by previous owner I was with my mechanic and had him code them when I switched them around the values matched

Wolf 335 · 07-01-2017, 06:15 PM

Could a damaged air intake valve cause this?

Maybe previous owner damaged it during cleaning.

f87king · 07-01-2017, 06:16 PM

Quote:

Originally Posted by Wolf 335

Could a damaged air intake valve cause this?

Maybe previous owner damaged it during cleaning.

It just started happening I've done everything on my car and it's ran great 17-21psi for the last 7 months

JuniorB · 07-01-2017, 10:19 PM

Have you done any work prior to the misfire, are you triggering code for this, and is it in the whole rpm band or just the higher? So if you pull the connector off there is no difference ? Check the connector for power and its wires, what's the code?

f87king · 07-01-2017, 10:21 PM

Quote:

Originally Posted by JuniorB

Have you done any work prior to the misfire, are you triggering code for this, and is it in the whole rpm band or just the higher? So if you pull the connector off there is no difference ? Check the connector for power and its wires, what's the code?

I did a valve cover gasket coils and plugs its constantly combustion misfire 1 installing new battery as we speak and testing mosfets

=C= · 07-01-2017, 11:19 PM

O2 pre-cat sensors?

Has the car ever had the intake manifold walnut blasted? Maybe Cyl 1 is full of crap ie worse off than other cylinders.

feuer · 07-04-2017, 10:11 PM

Quote:

Originally Posted by LGCubana

Worst case scenario would be the DME.

Happened to a friend recently, with an '08, with >120K miles

Worse case scenario would be demaged head 😰

MysticRob · 07-05-2017, 11:54 AM

Get a compression and leakdown test done on all cylinders. If the cylinder you're seeing the misfire on tests much lower then you've narrowed down your possible number of problems.

turekaj · 07-05-2017, 12:01 PM

Did you install new injector seals when swapping them around ?

Faredo · 07-05-2017, 03:18 PM

Did you replace the plugs with new ones or just move them around. Ive done this myself and oddly enough moving plugs from cyl to cyl i still had a miss in 6
.

f87king · 07-05-2017, 09:29 PM

Quote:

Originally Posted by turekaj

Did you install new injector seals when swapping them around ?

Quote:

Originally Posted by turekaj

Did you install new injector seals when swapping them around ?

yes I did

f87king · 07-05-2017, 09:30 PM

I'm leaning towards HPFP throwing an inactive shadow code long cranks rail pressure under 1k during misfire logs

f87king · 07-05-2017, 09:31 PM

Quote:

Originally Posted by Faredo

Did you replace the plugs with new ones or just move them around. Ive done this myself and oddly enough moving plugs from cyl to cyl i still had a miss in 6
.

brand new ngk plugs gapped at .020 my previous plugs weren't misfiring. compression test 175 all around yes I got new injector seals and decouplers

feuer · 07-05-2017, 10:28 PM

If ECU checks out then is the head, enlarged bore for the injector.

f87king · 07-05-2017, 10:29 PM

Quote:

Originally Posted by feuer

If ECU checks out then is the head, enlarged bore for the injector.

The injector in 1 is not enlarged can assure that the issue is either HPFP mosfets or something with electrical. B4 changing tune coils plugs gasket I had a no misfire car and great logs to show for it. Now my rail pressure is low

Faredo · 07-05-2017, 10:59 PM

If it's always the same cylinder I can't see it being hpfp. Have you tried gapping that one down to 18?
I hate this for you man. I know it's frustrating as hell.

f87king · 07-05-2017, 11:22 PM

Quote:

Originally Posted by Faredo

If it's always the same cylinder I can't see it being hpfp. Have you tried gapping that one down to 18?
I hate this for you man. I know it's frustrating as hell.

Thought the same thing but on facebook group replies from 2 people stated there's was misfiring on only one cylinder and was a hpfp issue. I will gap the plugs down tho forsure

Levanime · 07-05-2017, 11:50 PM

what codes do u get exactly?
can u post last 7 digits of VIN number?

f87king · 07-05-2017, 11:51 PM

Quote:

Originally Posted by Levanime

what codes do u get exactly?
can u post last 7 digits of VIN number?

combustion cylinder 1 e067328 msd81 dme

07-01-2017, 04:30 PM	#1
f87king Banned 20 Rep 95 Posts Drives: M2 Comp Single Turbo Join Date: Feb 2016 Location: California iTrader: (0)	Misfire same cylinder changed everything I'm not one to ask stupid questions but I've searched every forum and done everything to diagnose my misfire. I changed my valce cover gasket plugs coils and have index 12 injectors and I have a constant misfire 1. I have moved plugs replaced coils moved injectors everything still same cylinder misfire. Has anyone experienced misfires in one cylinder that is not related to coils, plugs, injectors and was something else? I want to get this sorted out I just paid for a custom tune and can't even use it My car was running perfect b4 the VCG new coils and plugs now misfire if I step on it but if I ease into it no misfire. I did a compression test and the numbers were good.
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07-01-2017, 05:16 PM	#3
NoQuarter Captain 168 Rep 906 Posts Drives: 2008 535xi / 2011 Z4 35Is Join Date: Jan 2011 Location: Indiana iTrader: (0) Garage List 2018 BMW X2 [0.00] 2008 535xi [0.00] 2011 Z4 35is [0.00]	Who coded for the injectors? Can you verify the Values?
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07-01-2017, 06:15 PM	#5
Wolf 335 Brigadier General 2572 Rep 3,663 Posts Drives: 2007 E92 335i Join Date: Aug 2012 Location: Toronto iTrader: (0)	Could a damaged air intake valve cause this? Maybe previous owner damaged it during cleaning.
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07-01-2017, 10:19 PM	#7
JuniorB Major 186 Rep 1,017 Posts Drives: 07 e60 525 N54 Join Date: Mar 2016 Location: Rhode Island iTrader: (0)	Have you done any work prior to the misfire, are you triggering code for this, and is it in the whole rpm band or just the higher? So if you pull the connector off there is no difference ? Check the connector for power and its wires, what's the code?
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07-01-2017, 11:19 PM	#9
=C= First Lieutenant 75 Rep 311 Posts Drives: 2007 BMW 335i M-Sport E90 Join Date: Jul 2012 Location: land of the long white cloud iTrader: (0)	O2 pre-cat sensors? Has the car ever had the intake manifold walnut blasted? Maybe Cyl 1 is full of crap ie worse off than other cylinders.
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07-05-2017, 11:54 AM	#11
MysticRob Captain 573 Rep 870 Posts Drives: 2009 335i E90 Join Date: Jan 2017 Location: Fremont, CA iTrader: (0) Garage List 2009 BMW 335i E90 S ... [10.00]	Get a compression and leakdown test done on all cylinders. If the cylinder you're seeing the misfire on tests much lower then you've narrowed down your possible number of problems. __________________ 2008 E61 535xi Sport Wagon / 100k Miles / Deep Sea Blue Metallic / Natural Brown Interior / MHD Stage 1 91 CA-Octane Tune. SOLD - 2009 E90 335i M-Sport Sedan / 143k Miles / Alpine White Exterior / Chestnut Brown Interior / Mishimoto FMIC / xHP Stage 2.
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07-05-2017, 12:01 PM	#12
turekaj Enlisted Member 4 Rep 32 Posts Drives: '09 335i Join Date: Jan 2016 Location: Austin, TX iTrader: (0)	Did you install new injector seals when swapping them around ?
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07-05-2017, 03:18 PM	#13
Faredo Lieutenant 318 Rep 404 Posts Drives: 335i Join Date: Sep 2016 Location: Arkansas iTrader: (0)	Did you replace the plugs with new ones or just move them around. Ive done this myself and oddly enough moving plugs from cyl to cyl i still had a miss in 6 . __________________ Mods related to trouble shooting posts: Stock Turbos, MHD OTS V7 stage 2+ 93 oct, VRSF Downpipes, VRSF Relocated inlets, CTS Turbo 7" Intercooler, Tial BOV with upgraded line 5.56mm, index 12 injectors, A/T OEM Flash.
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07-05-2017, 09:30 PM	#15
f87king Banned 20 Rep 95 Posts Drives: M2 Comp Single Turbo Join Date: Feb 2016 Location: California iTrader: (0)	I'm leaning towards HPFP throwing an inactive shadow code long cranks rail pressure under 1k during misfire logs
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07-05-2017, 10:28 PM	#17
feuer Major General 4294 Rep 9,228 Posts Drives: wife crazy! Join Date: Apr 2015 Location: Chicago, IL iTrader: (5)	If ECU checks out then is the head, enlarged bore for the injector.
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07-05-2017, 10:59 PM	#19
Faredo Lieutenant 318 Rep 404 Posts Drives: 335i Join Date: Sep 2016 Location: Arkansas iTrader: (0)	If it's always the same cylinder I can't see it being hpfp. Have you tried gapping that one down to 18? I hate this for you man. I know it's frustrating as hell.
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07-05-2017, 11:50 PM	#21
Levanime BimECU 193 Rep 760 Posts Drives: BMW Join Date: Dec 2014 Location: SD iTrader: (0) Garage List 2007 BMW 335 [0.00]	what codes do u get exactly? can u post last 7 digits of VIN number?
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