Help consistent bank 2 misfires

jem06009 · 07-01-2015, 08:22 PM

So I keep gettin misfires in cylinders 4,5,6 . Changed both primary O2 sensors injectors, and all 6 plugs. moved the coil packs around to different bank and no change. Checked values of lpfp sensor in inpa and it looks good(stays around 5000 hpa).. I'd get misfires only during load not even heavy load. The car starts fine no long cranks at all so I don't think it is the hpfp.. Idk what else to do guys. Car has jb4 and catless downpipes. If it was the DME wouldn't I get a 30bb code? I'm really stuck here.

Mike@N54Tuning.com · 07-02-2015, 02:59 PM

Quote:

Originally Posted by jem06009

So I keep gettin misfires in cylinders 4,5,6 . Changed both primary O2 sensors injectors, and all 6 plugs. moved the coil packs around to different bank and no change. Checked values of lpfp sensor in inpa and it looks good(stays around 5000 hpa).. I'd get misfires only during load not even heavy load. The car starts fine no long cranks at all so I don't think it is the hpfp.. Idk what else to do guys. Car has jb4 and catless downpipes. If it was the DME wouldn't I get a 30bb code? I'm really stuck here.

All maps? Your Fuel pressure okay (JB4 log)

Mike

Spacecpe · 07-02-2015, 07:13 PM

carbon on valves ?

boostaholic786 · 07-03-2015, 09:02 PM

If you don't have a catch can most probably it is clogged intake valves/ports.. The factory PCV system is horrible for n54's that are pushing more boost...actually even if you have a stock n54, the factory PCV valve is pathetic and you if I was you I would look into getting the RB PCV valve from Rob. You might not think something so small could be causing you to have issues with your car but the truth of the matter is that it does make a huge difference. Get a RB PCV valve which is like $25 bucks, then get your intake walnut shell blasted and just to be safe, throw on a BMS catch can and you should be good! Make sure you clean up all that oil by your intercooler piping if possible when you have your valves cleaned up. This might help if you have already changed what you have said you have changed... just my 2cents

j1gilles · 07-05-2015, 11:09 AM

Quote:

Originally Posted by jem06009

So I keep gettin misfires in cylinders 4,5,6 . Changed both primary O2 sensors injectors, and all 6 plugs. moved the coil packs around to different bank and no change. Checked values of lpfp sensor in inpa and it looks good(stays around 5000 hpa).. I'd get misfires only during load not even heavy load. The car starts fine no long cranks at all so I don't think it is the hpfp.. Idk what else to do guys. Car has jb4 and catless downpipes. If it was the DME wouldn't I get a 30bb code? I'm really stuck here.

DME...

07-01-2015, 08:22 PM	#1
jem06009 New Member 0 Rep 11 Posts Drives: 08 BMW 335 XI Join Date: May 2013 Location: United States iTrader: (0)	Help consistent bank 2 misfires So I keep gettin misfires in cylinders 4,5,6 . Changed both primary O2 sensors injectors, and all 6 plugs. moved the coil packs around to different bank and no change. Checked values of lpfp sensor in inpa and it looks good(stays around 5000 hpa).. I'd get misfires only during load not even heavy load. The car starts fine no long cranks at all so I don't think it is the hpfp.. Idk what else to do guys. Car has jb4 and catless downpipes. If it was the DME wouldn't I get a 30bb code? I'm really stuck here.
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07-02-2015, 07:13 PM	#3
Spacecpe First Lieutenant 46 Rep 359 Posts Drives: E90 335i Msport Join Date: Sep 2014 Location: Winnipeg, Mb Canada iTrader: (0)	carbon on valves ?
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07-03-2015, 09:02 PM	#4
boostaholic786 Captain 40 Rep 622 Posts Drives: E92 N54 with MHD Custom flash Join Date: Dec 2011 Location: Plano TX iTrader: (0)	If you don't have a catch can most probably it is clogged intake valves/ports.. The factory PCV system is horrible for n54's that are pushing more boost...actually even if you have a stock n54, the factory PCV valve is pathetic and you if I was you I would look into getting the RB PCV valve from Rob. You might not think something so small could be causing you to have issues with your car but the truth of the matter is that it does make a huge difference. Get a RB PCV valve which is like $25 bucks, then get your intake walnut shell blasted and just to be safe, throw on a BMS catch can and you should be good! Make sure you clean up all that oil by your intercooler piping if possible when you have your valves cleaned up. This might help if you have already changed what you have said you have changed... just my 2cents __________________ [SIZE="2"]Crimson Red E92 335i M-sport 6-speed with MHD custom stage 2+ flash only , 40% E85/93 mix,+ HRE P40S wheels, KW Clubsport, M3 sways,+BMW performance CF Mirrors, BMW Performance CF deck lid spoiler,+ CF interior trim, p3 vent boost gauge,+ LUX angel eyes (11.73@124mph on street tires)
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