N52 still misfiring after new parts

Volatile_ · 09-11-2017, 08:47 AM

Hi all,

My 2007 328i recently developed a pretty bad misfire situation. I hooked up a scan tool which dictated that the culprit was #6. As the car has just over 104k miles, I decided it would be beneficial at this point to just replace all 6 coils and plugs, as I have had issues with coils in the past, I'm suspecting due to an oil leak that the dealer took care of. I replaced everything yesterday, Bosch coils, Denso plugs gapped at .0043.

Before putting the cover back on I fired it up, and I'm still having the exact same issue. The car is misfiring quite badly, and my scan tool is still telling me it's #6. Everything is seated properly, and my plugs are torqued correctly.

Am I missing something here? I know that OEM plugs are pre-gapped, but I got mine from Rock Auto and gapped them according to info I found after doing a bit of research.

Thanks!

Phil325i · 09-11-2017, 10:54 AM

Injector malfunction? The lead to No.6 injector can easily get snagged. I had a misfire on that cylinder and the lead had popped off..

Volatile_ · 09-12-2017, 07:26 AM

I will definitely check all of the injectors when I get a chance this weekend, thanks for the tip.

09-11-2017, 08:47 AM	#1
Volatile_ Registered 0 Rep 4 Posts Drives: 2007 E92 328i Join Date: Jun 2014 Location: Philly iTrader: (0)	N52 still misfiring after new parts Hi all, My 2007 328i recently developed a pretty bad misfire situation. I hooked up a scan tool which dictated that the culprit was #6. As the car has just over 104k miles, I decided it would be beneficial at this point to just replace all 6 coils and plugs, as I have had issues with coils in the past, I'm suspecting due to an oil leak that the dealer took care of. I replaced everything yesterday, Bosch coils, Denso plugs gapped at .0043. Before putting the cover back on I fired it up, and I'm still having the exact same issue. The car is misfiring quite badly, and my scan tool is still telling me it's #6. Everything is seated properly, and my plugs are torqued correctly. Am I missing something here? I know that OEM plugs are pre-gapped, but I got mine from Rock Auto and gapped them according to info I found after doing a bit of research. Thanks!
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09-11-2017, 10:54 AM	#2
Phil325i Brigadier General 622 Rep 3,198 Posts Drives: E92 325i MSport Coupe Join Date: Apr 2012 Location: UK South East iTrader: (1) Garage List 2009 BMW 325i Coupe [6.00]	Injector malfunction? The lead to No.6 injector can easily get snagged. I had a misfire on that cylinder and the lead had popped off.. __________________ E92 pre-LCI 325i - Ohlins R&T; H&R spacers; M3 strut brace; Swift thrust sheets; 3 x chassis braces; diff brace; N53 V-brace; 034 subframe inserts; BMS clutch stop; BMS CDV; RE g/box mounts; Delrin shift bushes; Saikoumichi OCC; Cyba scoops; BMW Perf Exhaust; HEL s/steel brake hoses; M3 rear spoiler; Recaro Sportster CSs; M3 white dash LEDs; LED Angels; LED side repeaters; BMW Perf black grille; CSL reps; SSDD carbon diffuser; Monster Wrap black roof/clear front
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09-12-2017, 07:26 AM	#3
Volatile_ Registered 0 Rep 4 Posts Drives: 2007 E92 328i Join Date: Jun 2014 Location: Philly iTrader: (0)	I will definitely check all of the injectors when I get a chance this weekend, thanks for the tip.
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