is there a jb4 specialist in MA?

fireman02169 · 05-19-2015, 08:30 PM

Looking for a shop in mass that knows jb4. Having trouble with misfires and limp mode. Car runs fine in map0. TIA

thegrinchboy · 05-19-2015, 08:48 PM

May want to post in the New England specific regional forum as well.

mike@x-ph.com · 05-20-2015, 03:42 PM

Change your spark plugs.
By the way title says JB5

fireman02169 · 05-20-2015, 04:01 PM

Quote:

Originally Posted by mike@x-ph.com25

Change your spark plugs.
By the way title says JB5

Haha, so it does. I have dat fingers.
spark plugs are a week old
intake cleaned 2 days ago
i found out today that it runs great in map1 when cold. As soon as i get up to operating temp it starts giving me problems. Missfire cyl 6- limp mode.
When the car gets up to operating temp it runs WOT with the jb4 disabled with no problems, but gives me the same symptoms in map1 and map5. I havent tried map2 yet but i cant imagine it would be any different.

What would cause missfires/limp mode in just cyl 6 with the jb on JUST at operating temp? (2 hash marks below 250 on the temp gague)

I havent gotten around to swapping coil packs yet. I know thats the next reasonable step, but im sure it will make no difference.

Any thoughts?

W.WCherry · 05-20-2015, 04:09 PM

Swap coil packs, if that doesn't fix it, you probably need a fuel injector.

BeastMode335i · 05-20-2015, 04:11 PM

JB5 YO!

DJtoad · 05-20-2015, 04:25 PM

A JB4, like any tune, will bring to light any weaknesses in your car such as plugs, coils, or injectors. Capture a log and post it to the support forum on n54tech and someone should be able to point you in the right direction. But it does sound like a weak coil on cylinder 6. The JB4 won't actually increase boost until your oil is up to temp which is why things are fine when your car is cold.

fireman02169 · 05-20-2015, 04:51 PM

Quote:

Originally Posted by DJtoad

A JB4, like any tune, will bring to light any weaknesses in your car such as plugs, coils, or injectors. Capture a log and post it to the support forum on n54tech and someone should be able to point you in the right direction. But it does sound like a weak coil on cylinder 6. The JB4 won't actually increase boost until your oil is up to temp which is why things are fine when your car is cold.

Ok, that helps make some sense of it all. I didnt know that.

MineralweissIS · 05-21-2015, 12:39 PM

One thing you can do rule out a faulty fuel injector is to remove the coil in cylinder 6 with the one in cylinder 5. If you get a code for a misfire in cylinder 5, you know you have a faulty coil and not a faulty injector.

05-19-2015, 08:30 PM	#1
fireman02169 Private 3 Rep 58 Posts Drives: 2009 335i xdrive Join Date: Aug 2013 Location: Pembroke, MA iTrader: (0)	is there a jb4 specialist in MA? Looking for a shop in mass that knows jb4. Having trouble with misfires and limp mode. Car runs fine in map0. TIA Last edited by fireman02169; 05-20-2015 at 05:33 PM..
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05-19-2015, 08:48 PM	#2
thegrinchboy Captain 62 Rep 701 Posts Drives: '11 335xi, '18 X1, '21 M2C Join Date: Jun 2012 Location: NH iTrader: (14) Garage List 2021 BMW M2 Competi ... [0.00] 2018 BMW X1 [0.00] 2011 BMW 335xi Msport [0.00]	May want to post in the New England specific regional forum as well.
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05-20-2015, 03:42 PM	#3
mike@x-ph.com BimmerPost Supporting Vendor 24193 Rep 190,805 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	Change your spark plugs. By the way title says JB5 __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
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05-20-2015, 04:09 PM	#5
W.WCherry Lieutenant 35 Rep 419 Posts Drives: e92 Join Date: Feb 2011 Location: Charleston, SC iTrader: (3)	Swap coil packs, if that doesn't fix it, you probably need a fuel injector. __________________ Performance \|Dinan Stage 3 Software\|Dinan IC\|Dinan OC\|UUC/Corsa Exhaust\|Koni FSD Shocks and Struts\|Eibach Spings\|Hotchkis Anti Sway Bars\|6MT\|Style \|Aero Lip\|Aero Rear\|M3 Spoiler\|BMW Gloss Black Kidney Grills\|BMW Aluminum Pedals\|BMW LCI Tail Lights\|HID Fog Lights\|25%Tint\|Advan AVS Model F7 19" Rims\|Lux V3 AEs\|Premium\|Sport\|Comfort Access\|
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05-20-2015, 04:11 PM	#6
BeastMode335i Maximus Decimus Meridius 1130 Rep 4,584 Posts Drives: F30 335i Join Date: Apr 2014 Location: Down South iTrader: (2)	JB5 YO! __________________ F30 335i Melbourne Red Metallic M-Sport Package
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05-20-2015, 04:25 PM	#7
DJtoad Captain 58 Rep 665 Posts Drives: 2010 535i M Sport Join Date: May 2008 Location: Ellicott City, MD iTrader: (2)	A JB4, like any tune, will bring to light any weaknesses in your car such as plugs, coils, or injectors. Capture a log and post it to the support forum on n54tech and someone should be able to point you in the right direction. But it does sound like a weak coil on cylinder 6. The JB4 won't actually increase boost until your oil is up to temp which is why things are fine when your car is cold. __________________ 2010 535i M Sport - Platinum Gray/Dakota Black/Anthracite Bamboo 2016 Jaguar F-Type S AWD - Polar White/Cirrus
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05-21-2015, 12:39 PM	#9
MineralweissIS Second Lieutenant 47 Rep 201 Posts Drives: 2012 Mineral White 335is Join Date: Aug 2013 Location: Miami, FL iTrader: (2) Garage List 2012 BMW 335is [0.00]	One thing you can do rule out a faulty fuel injector is to remove the coil in cylinder 6 with the one in cylinder 5. If you get a code for a misfire in cylinder 5, you know you have a faulty coil and not a faulty injector.
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