Problems with JB4

alex492 · 02-28-2014, 11:19 PM

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?

stashtrey · 02-28-2014, 11:29 PM

Check your coils. Did you pull codes? Sounds like plugs or coils.

jayzF30 · 02-28-2014, 11:31 PM

Check your codes

HeavyMetalRocker · 02-28-2014, 11:32 PM

That is a misfire man, go read the misfire sticky. Nothing is wrong with your JB4.

MikeE90NC · 03-01-2014, 01:25 AM

Yep, plugs, coils or injectors.

07tundra · 03-01-2014, 03:13 AM

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.

Acekid187 · 03-01-2014, 12:09 PM

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

02-28-2014, 11:19 PM	#1
alex492 New Member 2 Rep 27 Posts Drives: 2008 BMW 335xi Join Date: Jul 2013 Location: new york iTrader: (0)	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, 11:29 PM	#2
stashtrey Lieutenant Colonel 296 Rep 1,834 Posts Drives: 08 E90 335xi TiAg Join Date: Dec 2012 Location: Sacramento, CA iTrader: (8) Garage List 2008 E90 335xi Sedan [0.00]	Check your coils. Did you pull codes? Sounds like plugs or coils.
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02-28-2014, 11:31 PM	#3
jayzF30 Captain 36 Rep 783 Posts Drives: '07 335i, '09 M3 Join Date: Mar 2012 Location: Thornhill iTrader: (0)	Check your codes
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02-28-2014, 11:32 PM	#4
HeavyMetalRocker Captain 40 Rep 632 Posts Drives: 2007 BMW 335i E90 6MT Join Date: Nov 2012 Location: Dallas, Texas iTrader: (0)	That is a misfire man, go read the misfire sticky. Nothing is wrong with your JB4. __________________ 2007 335i e90 6mt \| Motiv 750 XR8267 \| RB PCV \| JB4 G5 \| MHD Pump Flash \| Walbro 255lph \| VRSF CP & Tial BOV \| NGK Plugs \| Custom Side Exhaust \| CxRacing FMIC \| Spec 2+ & SSMFW \| StopTech Drilled/Slotted Rotors \| Hawk Performance Pads \| DEFIV Lockdown kit \| Mtec V3 \| Apex PS7s \| 35/15% Llumar ceramic
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03-01-2014, 01:25 AM	#5
MikeE90NC Second Lieutenant 24 Rep 257 Posts Drives: 2007 BMW 335i Join Date: Jul 2013 Location: Somewhere, NC iTrader: (1)	Yep, plugs, coils or injectors.
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03-01-2014, 03:13 AM	#6
07tundra Lieutenant Colonel 122 Rep 1,524 Posts Drives: 8.1L Chevy 2500hd Join Date: Jan 2012 Location: New Mexico iTrader: (9)	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, 12:09 PM	#7
Acekid187 Lieutenant 28 Rep 423 Posts Drives: E92 335i, E90 335i Join Date: Mar 2013 Location: Hawaii iTrader: (6)	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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