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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Problems with JB4



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      02-28-2014, 10:19 PM   #1
alex492
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Exclamation Problems with JB4

So I've had the jb4 installed on my 2008 335xi since about march of 2013 and never had any troubles until this winter. Whenever turn on the map (map 2 because I have downpipes) and floor it from a stop, it jerks at about 5000rpm in first and then in 2nd it loses all power and the service engine soon light comes on. So when this happened I immediately stopped the car and had it in idle and it ran extremely rough making weird noises. I then turned off the car and turned it back on again and it was fine. But same thing keeps happening when I floor from 1st to 2nd, loses power and light comes on.

Does anyone know whats wrong?
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      02-28-2014, 10:29 PM   #2
stashtrey
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Check your coils. Did you pull codes? Sounds like plugs or coils.
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      02-28-2014, 10:31 PM   #3
jayzF30
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Check your codes
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      02-28-2014, 10:32 PM   #4
HeavyMetalRocker
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That is a misfire man, go read the misfire sticky. Nothing is wrong with your JB4.
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      03-01-2014, 12:25 AM   #5
MikeE90NC
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Yep, plugs, coils or injectors.
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      03-01-2014, 02:13 AM   #6
07tundra
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How about you go to the correct forum like n54tech and post this in the support section and you will have tons of support. Terry will probably answer you himself.
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      03-01-2014, 11:09 AM   #7
Acekid187
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I had the same problem. It was a misfire. I changed out all the plugs an its been fine. I even started running more boost never had a issue after changing plugs
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