JB4 Misfiring

xhgwx · 07-17-2013, 06:50 PM

I've just installed the JB4 and was excited, put in on map one, and went wot hit 4000rpm and misfired. Turned off the car restarted and it went away, put it on map 0 WOT and ran fine. Emailed terry and sent pics and everything was is in correctly. So tomorrow I'm changing all my plugs considering I bought it used I have no idea when they were last changed an I'm at 83k. So hopefully this foxes it, it was misfiring on multiple cylinders. The plugs seem like a good idea?
Thanks for responses.
-XHGWX-

smallseafishie · 07-17-2013, 07:46 PM

read your codes to be sure.

Plugs, and check coil packs,

AndyR83 · 07-17-2013, 07:58 PM

Step one is spark plugs for sure. That was the culprit when I had this issue. I'd also suggest walnut blasting to help clean out all the junk that accumulates inside the engine. Other possible causes include coil packs and injectors.

07-17-2013, 06:50 PM	#1
xhgwx New Member 0 Rep 17 Posts Drives: 335i Convert Join Date: May 2013 Location: Oklahoma iTrader: (0)	JB4 Misfiring I've just installed the JB4 and was excited, put in on map one, and went wot hit 4000rpm and misfired. Turned off the car restarted and it went away, put it on map 0 WOT and ran fine. Emailed terry and sent pics and everything was is in correctly. So tomorrow I'm changing all my plugs considering I bought it used I have no idea when they were last changed an I'm at 83k. So hopefully this foxes it, it was misfiring on multiple cylinders. The plugs seem like a good idea? Thanks for responses. -XHGWX-
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07-17-2013, 07:46 PM	#2
smallseafishie Colonel 110 Rep 2,017 Posts Drives: AW 07 e92 335i + AW 11 X5 35d Join Date: Jun 2007 Location: Atlanta GA iTrader: (13) Garage List 2007 E92 335i [0.00]	read your codes to be sure. Plugs, and check coil packs,
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07-17-2013, 07:58 PM	#3
AndyR83 Major 60 Rep 1,024 Posts Drives: E92 335i FBO Join Date: Oct 2011 Location: PA iTrader: (5)	Step one is spark plugs for sure. That was the culprit when I had this issue. I'd also suggest walnut blasting to help clean out all the junk that accumulates inside the engine. Other possible causes include coil packs and injectors.
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