Misfire? Help me

jojo2333 · 06-04-2021, 04:14 PM

I have a misfire on cylinder 1. I swapped coils with cylinder 2 and the misfire remained at cylinder 1. Then I swapped spark plugs with cylinder 2 and the misfire is still currently at cylinder 1.

No limp mode, although once in a blue moon I see a fuel pump plausibility code come up for my car. Very rarely though.

The spark plug in cylinder 1 does not smell of fuel.

If the fuel pumps (either one) were bad, would I have a consistent code for fuel pumps? Also, if I needed new Vanos solenoids or a cleaning, would this also throw a code?

I have no code other than misfire which kinda leads me to believe it could need a walnut blast.

Any opinions? Thank you!

E92N55Jeff · 06-04-2021, 07:51 PM

If its not your plugs or coils it could be your injector, if not I would just walnut blast, these cars build up a lot of carbon and it'll misfire. Im not sure about the fuel pump issue tho

whyzee125 · 06-05-2021, 08:41 PM

Wrong category but what index are your injectors if n54? That's the next most likely culprit.

jojo2333 · 06-10-2021, 01:11 PM

Update on this thread. Moved coils, plugs, put in a new used injector (working one). Still got a misfire coming up but no CEL. I got to scan it again. Injector helped as my idle is smooth and less hiccups but still have a misfire appearing.

BashShah · 06-11-2021, 10:11 PM

walnut blast it.
you will be surprised what it does for mis fires.

Cloverdale · 06-11-2021, 11:01 PM

I moved injector on my misfire and the misfire moved (suspect your's will too, nothing to lose but some of your time). Not changing the tiny teflon seals has had no ill effects either.
Also, you don't have to walnut blast to effectively clean intake valves (done 2 335's with CRC intake cleaner left in chambers overnight and tooth brushes with shopvac).

06-04-2021, 04:14 PM	#1
jojo2333 Private 13 Rep 64 Posts Drives: BMW 135i Join Date: Oct 2020 Location: Toronto, Canada iTrader: (0)	Misfire? Help me I have a misfire on cylinder 1. I swapped coils with cylinder 2 and the misfire remained at cylinder 1. Then I swapped spark plugs with cylinder 2 and the misfire is still currently at cylinder 1. No limp mode, although once in a blue moon I see a fuel pump plausibility code come up for my car. Very rarely though. The spark plug in cylinder 1 does not smell of fuel. If the fuel pumps (either one) were bad, would I have a consistent code for fuel pumps? Also, if I needed new Vanos solenoids or a cleaning, would this also throw a code? I have no code other than misfire which kinda leads me to believe it could need a walnut blast. Any opinions? Thank you!
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06-04-2021, 07:51 PM	#2
E92N55Jeff Registered 0 Rep 4 Posts Drives: bmw 335i Join Date: Jun 2021 Location: Las Vegas iTrader: (0)	If its not your plugs or coils it could be your injector, if not I would just walnut blast, these cars build up a lot of carbon and it'll misfire. Im not sure about the fuel pump issue tho
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06-05-2021, 08:41 PM	#3
whyzee125 Brigadier General 1679 Rep 3,645 Posts Drives: Dinan stage 2 335i Join Date: Jul 2014 Location: Chattanooga Tn iTrader: (0)	Wrong category but what index are your injectors if n54? That's the next most likely culprit.
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06-10-2021, 01:11 PM	#4
jojo2333 Private 13 Rep 64 Posts Drives: BMW 135i Join Date: Oct 2020 Location: Toronto, Canada iTrader: (0)	Update on this thread. Moved coils, plugs, put in a new used injector (working one). Still got a misfire coming up but no CEL. I got to scan it again. Injector helped as my idle is smooth and less hiccups but still have a misfire appearing.
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06-11-2021, 10:11 PM	#5
BashShah Colonel 296 Rep 2,015 Posts Drives: 2012 335i Sedan Join Date: Oct 2012 Location: Vancouver, Canada iTrader: (0)	walnut blast it. you will be surprised what it does for mis fires.
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06-11-2021, 11:01 PM	#6
Cloverdale Second Lieutenant 123 Rep 257 Posts Drives: 2007 335i Jb4 & perf. mods. Join Date: Aug 2018 Location: Cloverdale, BC, Canada. iTrader: (0)	I moved injector on my misfire and the misfire moved (suspect your's will too, nothing to lose but some of your time). Not changing the tiny teflon seals has had no ill effects either. Also, you don't have to walnut blast to effectively clean intake valves (done 2 335's with CRC intake cleaner left in chambers overnight and tooth brushes with shopvac).
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