JB4 HELP! Engine shuts itself off after install

Supermoon · 02-28-2016, 09:33 PM

Hey guys I need some help with jb4.

I recently bought a used n55 jb4 G5 stage 2 and installed it yesterday.

After installation, the engine starts but the rpm goes up and down, shudders, misfires and finally shuts off after about 15 secs.

It doesn't shut off if I give it some throttle in N but it shudders like hell and I get the yellow half CEL.

I'm getting these four error codes. They keep appearing after being cleared.

2C85
Boost pressure sensor, plausibility: Pressure before throttle valve too high when engine not running

2C58
Boost pressure control, deactivation: Boost-pressure build-up blocked

2C83
Boost pressure sensor, plausibility: Pressure before throttle valve too high

2C71
Boost pressure sensor. Pressure too high

Some key facts..

1. The Jb4 came with FF wires and I did install it correctly (it was a PITA).

2. It has an older harness with a MAF sensor (purple).

3. Previous owner did ISO conversion and I updated to the latest ISO firmware yesterday.

4. Jb4 is on map 0.

5. I reset all settings to default including ISO ones using the steering wheel controls.

6. I reset the 'user adjustment' tab on jb4 interface according to the sticky thread on n54tech.com.

7. I pulled out all 3 connectors and made sure they are not plugged in backwards.
The connections are clean and tight.
Well, I could have screwed up but I really paid attention to the shape of the connectors and they all made sense.

8. I un-taped the felt tapes on the CAN wire bundles, took out the wires again, removed the black gunk again,
cleaned with rubbing alcohol, re-wrapped tightly, heat-shrinked and put everything back together so
I don't think the CAN connection is bad. I also made sure the ground connection is good.

9. My battery is running very low right now. I get low battery warning in 10 secs after inserting the key.
Could this be the problem?
I disconnected the negative terminal before installation.

10. I changed the spark plugs only about 6 months ago. Used Bosch oem ones.

11. I have ppk installed.

12. I didn't re-install the cowl before testing. Doubt it matters.

Did some searching here and there and someone mentioned the boost solenoid connectors being loose.
I double checked on that but they looked fine so I re-installed them carefully.

+

I noticed the MAP sensor on my engine only has 3 pins while the jb4 connector has 4 pins.
This normal right? If not then I might have damaged it during installation without noticing.

This is really about to turn into a nightmare..
Can somebody help me out please?
I'll also post this on n54tech.com shortly.

RMNB · 02-29-2016, 09:49 AM

Email Terri or Jon at BMS

OneMoreAlex · 02-29-2016, 07:12 PM

random thought but did you feel the map sensor click in? Maybe you have the wrong harness, that's the only difference between harness A/B.

Also on the harness did you leave the MAF sensor plug disconnected? That wire is no longer used. This problem sounds MAF related to me for some reason. Are you also running BMS intake? Did you remove the sensor and possibly not seat it fully down when reinstalling?

Manberg · 02-29-2016, 07:55 PM

Don't use the MAF sensor Refer to step 5, quoted below. "Plug 3 MAF"

Quote:

5) General reference photo below, see detailed info for each connection. As an overview you
will be installing plug 1 (TMAP, rainbow patch) & plug 2 (MAP, brown patch) for Stage1
systems. For JB4 systems you will also install plug 4 (boost solenoid, blue patch). Plug 3 (MAF
sensor, purple) is no longer used for any application. If you have an older harness with a purple
patch on it you can cut it off the harness or tuck it out of the way unused.

http://burgertuning.com/instructions/n55_stage1.pdf

Edit:

Quote:

The MAP sensor is positioned partly under a plastic cover which can be lifted up with your
hand as shown. Install is the same as the TMAP sensor.
NOTE FOR TYPE B THIS BROWN PLUG ALSO FITS IN THE MAF CONNECTOR ON
THE INTAKE. DO NOT PLUG IT IN THE MAF AS THIS WILL RESULT IN A CEL, POOR
IDLE, AND MAF ERROR FAULTS! THE CORRECT POSITION IS ON THE INTAKE
MANIFOLD AS SHOWN BELOW.

neverdone · 02-29-2016, 09:21 PM

Ya I think you plugged one into the wrong sensor. Take a pic of what sensors you installed on.

Sidewinderpb · 03-01-2016, 12:58 AM

Here's link to FF installation:

http://www.burgertuning.com/instruct...el_Install.pdf

Sorry, can't look over right now; I'm spent.

OneMoreAlex · 03-01-2016, 05:13 PM

Are you planning on reinstalling jb4? I'm curious to know what the problem was.

Manberg · 03-05-2016, 12:29 PM

Staying tuned in for results. Hope this works out!

OneMoreAlex · 03-07-2016, 07:59 PM

Quote:

Originally Posted by Supermoon

The green wire connection to to the TMAP sensor seems to have been unstable.

I spliced all wires properly using AL/CU wire nuts and checked the continuity of every single wire/pin with my multimeter.

All good. I haven't installed it yet but I think it should run fine now.

Good catch, let us know how it turns out when you reinstall.

Mike@N54Tuning.com · 03-09-2016, 03:23 PM

Quote:

Originally Posted by Supermoon

The green wire connection to to the TMAP sensor seems to have been unstable.

I spliced all wires properly using AL/CU wire nuts and checked the continuity of every single wire/pin with my multimeter.

All good. I haven't installed it yet but I think it should run fine now.

This looks like it would be the issue..

Mike

mike@x-ph.com · 03-09-2016, 06:17 PM

Quote:

Originally Posted by Supermoon

Just finished re-installing. It's now a piece of cake compared to the first time.

Good news. The engine doesn't stall anymore!

I noticed something's different this time as soon as I started the engine.

The engine revs smooth during cold start and the rpm doesn't go up and down anymore.

Awesome!!
Glad to know issue has been solved

puppydax · 03-09-2016, 06:50 PM

Quote:

Originally Posted by Supermoon

The green wire connection to to the TMAP sensor seems to have been unstable.

I spliced all wires properly using AL/CU wire nuts and checked the continuity of every single wire/pin with my multimeter.

All good. I haven't installed it yet but I think it should run fine now.

That's lame that someone even thought this was okay to leave without being crimped or soldered lol. Glad you figured it out though!

Supermoon · 03-09-2016, 07:21 PM

I took it for a spin last night and it was pulling strong on the highway even in map 1 but not a night and day difference from ppk.

Learned everything in a hard way.

Got it working in the end but for what cost.

A noob like me should've purchased a brand new jb4 and start from there or just get a cobb AP.

Things I learned:

1. You've got to plug the FF wires to the fuel rail sensor even if you'd never use e85.

2. Terry got rid of the reset button from the jb4 interface so you gotta type in values manually.
If you're running ISO, you should use the ISO sticky thread not the non-iso one. The default values are different.

3. When in doubt, check the wiring.

4. A power drill with a set of sockets will come very handy.

02-28-2016, 09:33 PM	#1
Supermoon Lieutenant 166 Rep 429 Posts Drives: 2011 e92 335xi Join Date: Aug 2015 Location: Seoul iTrader: (6) Garage List 2011 BMW 335i xDriv ... [10.00]	JB4 HELP! Engine shuts itself off after install Hey guys I need some help with jb4. I recently bought a used n55 jb4 G5 stage 2 and installed it yesterday. After installation, the engine starts but the rpm goes up and down, shudders, misfires and finally shuts off after about 15 secs. It doesn't shut off if I give it some throttle in N but it shudders like hell and I get the yellow half CEL. I'm getting these four error codes. They keep appearing after being cleared. 2C85 Boost pressure sensor, plausibility: Pressure before throttle valve too high when engine not running 2C58 Boost pressure control, deactivation: Boost-pressure build-up blocked 2C83 Boost pressure sensor, plausibility: Pressure before throttle valve too high 2C71 Boost pressure sensor. Pressure too high Some key facts.. 1. The Jb4 came with FF wires and I did install it correctly (it was a PITA). 2. It has an older harness with a MAF sensor (purple). 3. Previous owner did ISO conversion and I updated to the latest ISO firmware yesterday. 4. Jb4 is on map 0. 5. I reset all settings to default including ISO ones using the steering wheel controls. 6. I reset the 'user adjustment' tab on jb4 interface according to the sticky thread on n54tech.com. 7. I pulled out all 3 connectors and made sure they are not plugged in backwards. The connections are clean and tight. Well, I could have screwed up but I really paid attention to the shape of the connectors and they all made sense. 8. I un-taped the felt tapes on the CAN wire bundles, took out the wires again, removed the black gunk again, cleaned with rubbing alcohol, re-wrapped tightly, heat-shrinked and put everything back together so I don't think the CAN connection is bad. I also made sure the ground connection is good. 9. My battery is running very low right now. I get low battery warning in 10 secs after inserting the key. Could this be the problem? I disconnected the negative terminal before installation. 10. I changed the spark plugs only about 6 months ago. Used Bosch oem ones. 11. I have ppk installed. 12. I didn't re-install the cowl before testing. Doubt it matters. Did some searching here and there and someone mentioned the boost solenoid connectors being loose. I double checked on that but they looked fine so I re-installed them carefully. + I noticed the MAP sensor on my engine only has 3 pins while the jb4 connector has 4 pins. This normal right? If not then I might have damaged it during installation without noticing. This is really about to turn into a nightmare.. Can somebody help me out please? I'll also post this on n54tech.com shortly.
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02-29-2016, 09:49 AM	#2
RMNB Lieutenant Colonel 365 Rep 1,649 Posts Drives: 2021 440xi CPE BSM Join Date: Jul 2013 Location: Maryland iTrader: (0)	Email Terri or Jon at BMS
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02-29-2016, 07:12 PM	#3
OneMoreAlex Second Lieutenant 45 Rep 194 Posts Drives: 2012 e92 335i Join Date: Aug 2015 Location: Long Island, NY iTrader: (0)	random thought but did you feel the map sensor click in? Maybe you have the wrong harness, that's the only difference between harness A/B. Also on the harness did you leave the MAF sensor plug disconnected? That wire is no longer used. This problem sounds MAF related to me for some reason. Are you also running BMS intake? Did you remove the sensor and possibly not seat it fully down when reinstalling? __________________ 12' 335i \| CP-E CP \| MHD \| VRSF DP \| ALPINA B3 \| Last edited by OneMoreAlex; 02-29-2016 at 07:45 PM..
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02-29-2016, 09:21 PM	#5
neverdone Major 327 Rep 1,397 Posts Drives: X5, 335, Ford Lightning, 63 me Join Date: Jun 2014 Location: calgary iTrader: (0)	Ya I think you plugged one into the wrong sensor. Take a pic of what sensors you installed on.
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03-01-2016, 12:58 AM	#6
Sidewinderpb Banned 329 Rep 1,739 Posts Drives: 2017 340i xDrive 6mt Join Date: Nov 2013 Location: CT iTrader: (7)	Here's link to FF installation: http://www.burgertuning.com/instruct...el_Install.pdf Sorry, can't look over right now; I'm spent.
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03-01-2016, 05:13 PM	#7
OneMoreAlex Second Lieutenant 45 Rep 194 Posts Drives: 2012 e92 335i Join Date: Aug 2015 Location: Long Island, NY iTrader: (0)	Are you planning on reinstalling jb4? I'm curious to know what the problem was. __________________ 12' 335i \| CP-E CP \| MHD \| VRSF DP \| ALPINA B3 \|
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03-05-2016, 12:29 PM	#8
Manberg Second Lieutenant 88 Rep 239 Posts Drives: 2011 e90 335i Join Date: Aug 2013 Location: SoCal iTrader: (0)	Staying tuned in for results. Hope this works out! __________________ M-Sport, 6MT, PPK, JB4 ISO + Rev.3, VRSF 7'' FMIC, VRSF Catless DP, BMS Charge Pipe, MFactory LSD, Öhlins R&T, M3 Control Arms, Rogue 6MT Bushings, Remus Exhaust, Duke Dynamics CF Diffuser, Cyba Scoops, VMR VB3 19s, BMS Clucth Stop
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03-09-2016, 07:21 PM	#13
Supermoon Lieutenant 166 Rep 429 Posts Drives: 2011 e92 335xi Join Date: Aug 2015 Location: Seoul iTrader: (6) Garage List 2011 BMW 335i xDriv ... [10.00]	I took it for a spin last night and it was pulling strong on the highway even in map 1 but not a night and day difference from ppk. Learned everything in a hard way. Got it working in the end but for what cost. A noob like me should've purchased a brand new jb4 and start from there or just get a cobb AP. Things I learned: 1. You've got to plug the FF wires to the fuel rail sensor even if you'd never use e85. 2. Terry got rid of the reset button from the jb4 interface so you gotta type in values manually. If you're running ISO, you should use the ISO sticky thread not the non-iso one. The default values are different. 3. When in doubt, check the wiring. 4. A power drill with a set of sockets will come very handy.
	Appreciate 0 Quote