Wife's 335i N55 is misfiring, need help please! Logs attached

xslntx · 07-28-2021, 07:44 PM

Hey all, looking for some advice

Wife's car has had a slight misfire since we bought it used, but has progressively gotten worse over the past few years. It misfires and stumbles under partial throttle, under load. Misses less under WOT or when you absolutely feather it. Every once in a while it'll miss slightly while idling as well. Test drove a 2014 528 at my buddies' and it seemed considerably quicker.

So far I've done NGK spark plugs, all 6 new delphi coils, air filter, and put a new AGM battery in as preventitive maintenance (start/stop was acting up) but nothing has changed. Even tried swapping in my bosch coils from my E60 just for giggles.

The car is completely stock, has been well maintained, and has 120k miles.

Hopefully logs help,

4th gear:

[URL unfurl="true"]https://datazap.me/u/xslntx/misfire-4th?log=0&data=3-4-13-17-18-19-20-21-22[/URL]

1-4th:

[URL unfurl="true"]https://datazap.me/u/xslntx/misfire-1-4?log=0&data=3-4-13-17-18-19-20-21-22[/URL]

Car is a 2012 335iX, build 11/11 I believe, it does not throw any codes whatsoever.

Any input is greatly appreciated.

harkes · 07-28-2021, 09:25 PM

Wife's car......? Dont see the problem then

harkes · 07-28-2021, 10:41 PM

Try disconnecting the MAF sensor

ReeferCheefer · 07-29-2021, 03:39 PM

Clean/replace vanos solenoids. Could be injector

Charles B · 07-29-2021, 09:25 PM

Good video, will point you in the right direction.

Pussiwillow · 07-29-2021, 10:19 PM

Pics of wife?

frchdragon · 07-29-2021, 10:27 PM

Quote:

Originally Posted by Pussiwillow

Pics of wife?

Really???

n55david · 07-30-2021, 06:10 AM

Quote:

Originally Posted by Pussiwillow

Pics of wife?

lol.. this used to be the standard reply on most message boards back in the late 90s and early 2000s

Pussiwillow · 07-30-2021, 09:01 AM

This was a standard in bimmer forums during my e36 days. I'm glad someone got it Lol

frchdragon · 07-30-2021, 09:41 AM

Sorry guys, I was in the 5 series forum... The grown ups.

Pussiwillow · 07-30-2021, 10:44 AM

Quote:

Originally Posted by frchdragon

Sorry guys, I was in the 5 series forum... The grown ups.

Hahahaha yeeehaw

xslntx · 07-30-2021, 04:48 PM

Quote:

Originally Posted by harkes

Try disconnecting the MAF sensor

I'm 95% sure I've tried that, will do again to make sure

Quote:

Originally Posted by ReeferCheefer

Clean/replace vanos solenoids. Could be injector

Cleaned both solenoids and tested on bench, they seem to work fine.

Quote:

Originally Posted by Charles B

Good video, will point you in the right direction.

Thank you for that. Gave it a watch, problem is I don't have drivetrain malfunction and no codes are thrown. I have checked with an Autel and ISTA and there's nothing stored.

If I watch live data while the car idles, the misfire counter goes up by 1, on a random cylinder, every 10-45 seconds.
I also took off the intake today to check for carbon. Stuff's dirty but not N54 dirty. Will clean later on anyways.

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07-28-2021, 07:44 PM	#1
xslntx Registered 0 Rep 2 Posts Drives: F30 320, E60 535 Join Date: Feb 2020 Location: Canada iTrader: (0)	Wife's 335i N55 is misfiring, need help please! Logs attached Hey all, looking for some advice Wife's car has had a slight misfire since we bought it used, but has progressively gotten worse over the past few years. It misfires and stumbles under partial throttle, under load. Misses less under WOT or when you absolutely feather it. Every once in a while it'll miss slightly while idling as well. Test drove a 2014 528 at my buddies' and it seemed considerably quicker. So far I've done NGK spark plugs, all 6 new delphi coils, air filter, and put a new AGM battery in as preventitive maintenance (start/stop was acting up) but nothing has changed. Even tried swapping in my bosch coils from my E60 just for giggles. The car is completely stock, has been well maintained, and has 120k miles. Hopefully logs help, 4th gear: [URL unfurl="true"]https://datazap.me/u/xslntx/misfire-4th?log=0&data=3-4-13-17-18-19-20-21-22[/URL] 1-4th: [URL unfurl="true"]https://datazap.me/u/xslntx/misfire-1-4?log=0&data=3-4-13-17-18-19-20-21-22[/URL] Car is a 2012 335iX, build 11/11 I believe, it does not throw any codes whatsoever. Any input is greatly appreciated.
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07-28-2021, 09:25 PM	#2
harkes Colonel 1077 Rep 2,357 Posts Drives: M135i, E39 M5, NSX and AE86 Join Date: Apr 2014 Location: Xiamen, China iTrader: (0)	Wife's car......? Dont see the problem then __________________ M135i 8AT PWG, MHD, Pure Stage2, WMI via Torqbyte CM5-LT, Custom tuned by PureBoost (A Dane in China)
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07-28-2021, 10:41 PM	#3
harkes Colonel 1077 Rep 2,357 Posts Drives: M135i, E39 M5, NSX and AE86 Join Date: Apr 2014 Location: Xiamen, China iTrader: (0)	Try disconnecting the MAF sensor __________________ M135i 8AT PWG, MHD, Pure Stage2, WMI via Torqbyte CM5-LT, Custom tuned by PureBoost (A Dane in China)
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07-29-2021, 03:39 PM	#4
ReeferCheefer Private First Class 56 Rep 191 Posts Drives: 135i,335i,335xi,328dx, 535i Join Date: Sep 2014 Location: Chicago iTrader: (1) Garage List 2008 E90 Montego [0.00] 2022 s1000rr [0.00] 2016 S1000RR [0.00] 2011 535i xdrive [0.00]	Clean/replace vanos solenoids. Could be injector
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07-29-2021, 09:25 PM	#5
Charles B Charles B 60 Rep 84 Posts Drives: 335 M235 Z4 944 Turbo Join Date: Feb 2018 Location: Jersey iTrader: (0) Garage List 2013 BMW 335 [9.17] 2016 BMW Z4 [10.00] 1986 Porsche 944 Turbo [0.00]	Good video, will point you in the right direction.
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07-29-2021, 10:19 PM	#6
Pussiwillow Major 521 Rep 1,148 Posts Drives: Alpine white 2014 335i msport Join Date: Aug 2020 Location: Arizona iTrader: (2)	Pics of wife?
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07-30-2021, 09:01 AM	#9
Pussiwillow Major 521 Rep 1,148 Posts Drives: Alpine white 2014 335i msport Join Date: Aug 2020 Location: Arizona iTrader: (2)	This was a standard in bimmer forums during my e36 days. I'm glad someone got it Lol
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07-30-2021, 09:41 AM	#10
frchdragon Lieutenant 338 Rep 417 Posts Drives: 2016 BMW M4 Join Date: Feb 2021 Location: ON, Canada iTrader: (0)	Sorry guys, I was in the 5 series forum... The grown ups. __________________ '16 M4 bone stock '13 335ix Msport BM3 stage1 - MAD FMI - FTP CP - Bilstein B4 (SOLD) '85 635csi M30 turbo race car (SOLD)
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