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Default No steering controls, "engine malfunction" - 08-23-2020, 10:29 PM

Have JB4 and BMS PI controller. Car's been pretty carefree for several months since removing the MAP connection. (Before that got "engine malfunction" hiccups like ten times, could be a coincidence, or not.)

About four times in the last month the car has sputtered and/or died and/or displayed malfunctions. I've gotten codes for post *** oxygen too low and 2C58 boost pressure control deactivation. I don't know if they're related to the obvious symptoms.

The weirdest thing is at least twice the JB4 wheel controls stopped working temporarily. Today they didn't work after I got "engine malfunction" without sputtering or dying. After a couple minutes, with the engine temp about 170, I got the double flash and gauge sweep, and the controls started working.

I found some talk of similar issues like this: Longtime user...new JB4 Connection Issues! - N54Tech.com - International Turbo Racing Discussion

Could a bad chip cause intermittent wheel control loss and the other problems? Or something else? Thanks.
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Default 08-24-2020, 07:26 AM

Quote:
Originally Posted by hi rpm
Have JB4 and BMS PI controller. Car's been pretty carefree for several months since removing the MAP connection. (Before that got "engine malfunction" hiccups like ten times, could be a coincidence, or not.)

About four times in the last month the car has sputtered and/or died and/or displayed malfunctions. I've gotten codes for post *** oxygen too low and 2C58 boost pressure control deactivation. I don't know if they're related to the obvious symptoms.

The weirdest thing is at least twice the JB4 wheel controls stopped working temporarily. Today they didn't work after I got "engine malfunction" without sputtering or dying. After a couple minutes, with the engine temp about 170, I got the double flash and gauge sweep, and the controls started working.

I found some talk of similar issues like this: Longtime user...new JB4 Connection Issues! - N54Tech.com - International Turbo Racing Discussion

Could a bad chip cause intermittent wheel control loss and the other problems? Or something else? Thanks.
Hi,

How old is your board?

That almost sounds like a power issue- double check your power supply and make sure nothing is loose.


Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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hi rpm hi rpm is offline
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Default 08-24-2020, 07:33 AM

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
Hi,

How old is your board?

That almost sounds like a power issue- double check your power supply and make sure nothing is loose.
I bought the JB4 9/2017.

Re: power supply, you mean the red wire stuck in the fuse socket? Any other connections to check?
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bandook bandook is offline
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Default 08-29-2020, 06:06 PM

Check the ground. JB4 definitely needs a good ground. Where are you grounded now?
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Default 08-30-2020, 12:25 AM

Quote:
Originally Posted by bandook
Check the ground. JB4 definitely needs a good ground. Where are you grounded now?
Shock tower. I will check that, thanks. (Car's been in the shop for unrelated things for a week.)
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drwillb drwillb is offline
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Default 08-30-2020, 02:52 AM

Quote:
Originally Posted by hi rpm
I bought the JB4 9/2017.

Re: power supply, you mean the red wire stuck in the fuse socket? Any other connections to check?
The red wire should not be going to the fuse holder. That is no longer the recommended power source. Run the red wire to the boost solenoid and tap into the blue wire that bridges between the two connectors. Also, move your ground to the factory ground point near the coolant reservoir.

How’s your car battery?


2012 135i Mods: air scoops, CP, BMS filter, PS1, N20 TMAP, ADE FMIC, BMW PE, JB4, BMS BEF, 1M front body, full M3 suspension
Owned so far: 88 M3 x 2, 95 325is, 95 M3 x 2, 06 Mini Cooper S, 08 335 xi, 09 Z4 35i, 01 M3, 12 135i
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Default 08-30-2020, 05:18 AM

Quote:
Originally Posted by drwillb
The red wire should not be going to the fuse holder. That is no longer the recommended power source. Run the red wire to the boost solenoid and tap into the blue wire that bridges between the two connectors. Also, move your ground to the factory ground point near the coolant reservoir.

How’s your car battery?
Will I need more wire for either of those?

As far as I know the battery's fine, no weak starts or anything.
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Default 08-30-2020, 06:59 AM

Quote:
Originally Posted by hi rpm
Will I need more wire for either of those?

As far as I know the battery's fine, no weak starts or anything.
should not need more wire.

how old is the battery?


Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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Default 08-30-2020, 07:08 AM

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
should not need more wire.

how old is the battery?
I don't have any record of it being replaced, and I didn't, so probably 8 years.
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Default 09-12-2020, 05:36 PM

I rerouted power to the boost solenoid wire, and scraped off the paint under the shock tower bolt for the JB4 and PIC grounds, cleaning and electrical lubing everything. Elected not to run grounds to factory because the PIC wire was too short and it's possible to redo the grounds later if necessary, without removing all the panels. So far it's working fine, but the problem was intermittent so I'll try to post in a few months whether or not that continues.

I also have the FI-650HP power wire tapped into the JB4 wire (which is tapped into solenoid wire). I assume someone or something said to do that, but if someone reading this thinks it's bad, let me know.
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Default 10-07-2020, 01:59 PM

Everything seemed perfect for just short of a month and then it went haywire again. Started car after two stops of a few minutes or less and it sputtered and died twice, "engine malfunction". Bogged on starting at least once. Codes 2C58 and 2C6F. (Boost pressure build-up blocked, Boost pressure sensor short to B+). Next day no malfunction or roughness, but steering controls seem to randomly stop and start working. First they didn't like 3x, then they did 3x, then didn't 3x.

I'm pretty convinced the redone grounds are mated to the metal of the body; is that not enough for a perfect ground? I welcome ideas why things would be fine for a month, then suddenly and consistently bad.
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