1 carbon fouled plug

3.1L Z · 08-20-2014, 06:14 PM

Cobb tuned to aggressive stage 1. I changed my plugs after about 20K. Too long in there but got around to it. The #5 plug, by its self in the pic was carbon fouled. I'll go back in and check my new #5 after a couple thousand miles but any thoughts here? Was it just getting old and not firing accurately or something more serious?
Car was doing the typical hesitation upon full throttle with old plugs. Running well currently with the new plugs.

Thanks,
steve

N8N · 08-20-2014, 06:15 PM

I had the same on #6, it was the fuel injector.

Check your #5 plug after 1K miles or so if it is still doing it then suspect FI.

08-20-2014, 06:14 PM	#1
3.1L Z Private First Class 28 Rep 186 Posts Drives: '09 E92, Cobb AP Join Date: Jul 2012 Location: San Antonio iTrader: (0)	1 carbon fouled plug Cobb tuned to aggressive stage 1. I changed my plugs after about 20K. Too long in there but got around to it. The #5 plug, by its self in the pic was carbon fouled. I'll go back in and check my new #5 after a couple thousand miles but any thoughts here? Was it just getting old and not firing accurately or something more serious? Car was doing the typical hesitation upon full throttle with old plugs. Running well currently with the new plugs. Thanks, steve Attached Images __________________ '11 E92, MSport 3 Pedal 3.1L Stroker Z
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08-20-2014, 06:15 PM	#2
N8N Lieutenant Colonel 179 Rep 1,843 Posts Drives: 2009 E92 335i 6MT Join Date: Sep 2012 Location: Berwyn Heights, MD iTrader: (2)	I had the same on #6, it was the fuel injector. Check your #5 plug after 1K miles or so if it is still doing it then suspect FI.
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