30d misfire possibly injectors?

SomeRandomer123 · 06-18-2011, 08:35 PM

2009 E90 330d 55,000 Miles

Hey,
For a few months now I have noticed a slightly rougher idle than usual. It is intermittent and will do it at any temperature. The longer it is idling, the rougher it becomes from barely noticeable to (almost) "is this a 4 cylinder?" Vibration and noise increases although the revs remain steady. Once revved, it is reset and may or may not start again.
This morning - oh dear. It was a cold start and it was immediately so rough, it appeared to be misfiring and only on 4/5 cylinders. As we pulled away it became normal driving again and normal idle.

Any thoughts or experiences? I think it could be a injector(s) problem.

Feedback much appreciated!

s2k_335i · 06-19-2011, 12:10 AM

Try to order the replace the new plugs to see if works or not. If you still have misfired, try to exchange the coils.

SomeRandomer123 · 06-19-2011, 02:32 PM

Turned it on again this morning (cold start again) and it was 4 cylinder rough again! Taking it into BMW this week.

06-18-2011, 08:35 PM	#1
SomeRandomer123 Colonel 319 Rep 2,612 Posts Drives: F30 328i Luxury - Sport Auto Join Date: May 2011 Location: Lancashire, North West England, UK iTrader: (0)	30d misfire possibly injectors? 2009 E90 330d 55,000 Miles Hey, For a few months now I have noticed a slightly rougher idle than usual. It is intermittent and will do it at any temperature. The longer it is idling, the rougher it becomes from barely noticeable to (almost) "is this a 4 cylinder?" Vibration and noise increases although the revs remain steady. Once revved, it is reset and may or may not start again. This morning - oh dear. It was a cold start and it was immediately so rough, it appeared to be misfiring and only on 4/5 cylinders. As we pulled away it became normal driving again and normal idle. Any thoughts or experiences? I think it could be a injector(s) problem. Feedback much appreciated! __________________ Gone: 2006 BMW E60 520d SE 6MT Gone: 2009 BMW E90-LCI 330d SE 6MT Current: 2012 F30 328i Luxury 8AT On Order: 2015 Audi A6 Avant Ultra, Black Edition (sorry!)
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06-19-2011, 12:10 AM	#2
s2k_335i This is it!! 18 Rep 672 Posts Drives: FBO 335i without meth Join Date: Jul 2010 Location: Land of Freedom iTrader: (1)	Try to order the replace the new plugs to see if works or not. If you still have misfired, try to exchange the coils. __________________ DFW, TX. Current: 08' Cayenne GTS, 14' Boxster S, 12' CBR 1000', 04' Bayliner 2556 Sold: 2010 A4, 2008 335i, 2007 335i, 2006 M3, 2006 S2000, 1990 NSX, 1991 300zx, 1992 Supra, 1996 Prelude, 1981 CRX, 1980 Mustang.
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06-19-2011, 02:32 PM	#3
SomeRandomer123 Colonel 319 Rep 2,612 Posts Drives: F30 328i Luxury - Sport Auto Join Date: May 2011 Location: Lancashire, North West England, UK iTrader: (0)	Turned it on again this morning (cold start again) and it was 4 cylinder rough again! Taking it into BMW this week. __________________ Gone: 2006 BMW E60 520d SE 6MT Gone: 2009 BMW E90-LCI 330d SE 6MT Current: 2012 F30 328i Luxury 8AT On Order: 2015 Audi A6 Avant Ultra, Black Edition (sorry!)
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