[Maks///M2]

Hey guys, so I took off jb4 to do mhd or bm3.. still haven't decided.

I have a catless dp, NO charge pipe, and Berger intake, fabspeed muffler delete, intercooler.

Well I went in for the codes because my car says drivetrain malfunction.. getting some codes. You guys have any experience with them?

108A01 - charge-air temp sensor, electrical: short circuit to B+

119001 - Rail pressure sensor, electrical : short circuit to B+

120408 - charging pressure control : switch off as consequence (maybe fracked charge pipe?)

121001 - Charging pressure sensor, electrical: short circuit to b+

138104 - exhaust flap activation (fabspeed bypass)

1C3101- Engine-oil pressure sensor, plausibility: pressure too high before engine start

I had jb4 for bout 8k miles.

Any help would be greatly appreciated. I know the Berger intake has a CEL (so maybe first code is for the intake?)

Drove the car to the gas station and it is in limp mode.

Double checked to make sure I plugged all the plugs in and they are.

[cookiesowns]

Originally Posted by Maks///M2

Hey guys, so I took off jb4 to do mhd or bm3.. still haven't decided.

I have a catless dp, NO charge pipe, and Berger intake, fabspeed muffler delete, intercooler.

Well I went in for the codes because my car says drivetrain malfunction.. getting some codes. You guys have any experience with them?

108A01 - charge-air temp sensor, electrical: short circuit to B+

119001 - Rail pressure sensor, electrical : short circuit to B+

120408 - charging pressure control : switch off as consequence (maybe fracked charge pipe?)

121001 - Charging pressure sensor, electrical: short circuit to b+

138104 - exhaust flap activation (fabspeed bypass)

1C3101- Engine-oil pressure sensor, plausibility: pressure too high before engine start

I had jb4 for bout 8k miles.

Any help would be greatly appreciated. I know the Berger intake has a CEL (so maybe first code is for the intake?)

Clear codes and see if they come back. Those codes are always associated with JB4.

[Maks///M2]

I cleared them, and they came right back

[horsepower_and_hounds]

That is really odd, i just removed my JB4 and no codes.

[Maks///M2]

I got some help from a few people diagnosing... and basically I gotta replace the three sensors that the jb4 plugs into. And we think that will fix the problem.

I did NOT disconnect the battery while unplugging jb4 so maybe that is what could have killed my sensors? Not sure.

I will keep you guys updated once I get the new sensors in place! Hopefully by the end of the week

[nomade30]

No way you “fried” those sensors unplugging them. Are you clearing the codes with the ignition on and engine off?

[Maks///M2]

Originally Posted by nomade30

No way you “fried” those sensors unplugging them. Are you clearing the codes with the ignition on and engine off?

Ya ignition on and engine off.
The thing is they don't even clear. I delete them and about 1 second later the drivetrain malfunction light comes on

[nomade30]

What scanner are you using? Might be worth trying a more expensive one.

[horsepower_and_hounds]

What are you using to read codes? Try clearing them while car is running

[impulsiv]

Burnt fuse maybe?

[stefan]

Was there any update on this? This kind of crap is exactly why I haven't pulled the trigger on a JB4.

[RPM2-85]

Originally Posted by stefan

Was there any update on this? This kind of crap is exactly why I haven't pulled the trigger on a JB4.

Get a real flash. These piggy backs are bad for the M2.

[Maks///M2]

Well update. Car was hit. Been in the shop being fixed, and now it's at the dealer. I got a hold of them, and it's a blown dme. They have not given me a price on a new one yet. But I will keep you guys updated.

And new flash is bought and ready to go in, as soon as I get it back!

[Bee Pee]

Originally Posted by RPM2-85

Get a real flash. These piggy backs are bad for the M2.

Apparently, M2 + JB4 works really with JB4 in BEF mode - map 2 & DME overboost can co-exist.

M2 + Jb4 with octane specific BEF [from the likes of MHD] is a apparently step up too.

Despite me being a Jb4 user on M135i and not seen / read anything that shows BM3/MHD outperforming JB4 for N55, JB4 is out-dated. JB4 still comes into its own if wanting to run extra fuelling and or meth control, stacked on top of DME re-flash.

[horsepower_and_hounds]

Well.......
I tried the JB4 route first and it was so aggressive and surgy. I tried multiple maps and both E25-E30 and 93 and with with booster at times. The car flat ripped up the road and always tried to push the boost but it ran so erratically I could not stand it....then if things were a little off it would error out. I really think with the higher boost if tried to push and how hard it came in it would have made more dyno power than my current BM3 flash but I really really hated the way the car felt. So I gave up on it and went to the dedicated flash. I never gave it with a BEF a chance.

So just to be clear I am not a JB4 hater, ran it on my M4, M235 & 135 and it rocked. I just thought it sucked on the M2. The BM3 tune is sooooooo smooth and dependable

As for the DME damage......I really find it very far stretched that a modern day unit would do that but it is electronics. Even when those hit the + battery terminal with the plug it only damaged part on the JB4 circuit and not the DME. Wonder if there was water intrusion.....

[Bee Pee]

Originally Posted by Maks///M2

I did NOT disconnect the battery while unplugging jb4 so maybe that is what could have killed my sensors? Not sure.

Originally Posted by Maks///M2

now it's at the dealer. I got a hold of them, and it's a blown dme.

Yup - DME's can be overly-sensitive so un-installing any tuning box with battery still connected could easily pickle an ECU. Lesson learnt

[Maks///M2]

Originally Posted by Bee Pee

Apparently, M2 + JB4 works really with JB4 in BEF mode - map 2 & DME overboost can co-exist.

M2 + Jb4 with octane specific BEF [from the likes of MHD] is a apparently step up too.

Despite me being a Jb4 user on M135i and not seen / read anything that shows BM3/MHD outperforming JB4 for N55, JB4 is out-dated. JB4 still comes into its own if wanting to run extra fuelling and or meth control, stacked on top of DME re-flash.

I didn't like jb4 personally. In map 2 at 125mph it would cut out on me for a split second and throw a drivetrain malfunction.. so I had to always run it in map 1.

[Maks///M2]

Originally Posted by m2ruder

Well.......
I tried the JB4 route first and it was so aggressive and surgy. I tried multiple maps and both E25-E30 and 93 and with with booster at times. The car flat ripped up the road and always tried to push the boost but it ran so erratically I could not stand it....then if things were a little off it would error out. I really think with the higher boost if tried to push and how hard it came in it would have made more dyno power than my current BM3 flash but I really really hated the way the car felt. So I gave up on it and went to the dedicated flash. I never gave it with a BEF a chance.

So just to be clear I am not a JB4 hater, ran it on my M4, M235 & 135 and it rocked. I just thought it sucked on the M2. The BM3 tune is sooooooo smooth and dependable

As for the DME damage......I really find it very far stretched that a modern day unit would do that but it is electronics. Even when those hit the + battery terminal with the plug it only damaged part on the JB4 circuit and not the DME. Wonder if there was water intrusion.....

We will see what Bmw comes back with. They sent it up for a warranty thing. And we will find out if it's covered or not. I'll let you guys know the out come

[Bee Pee]

Originally Posted by Maks///M2

I didn't like jb4 personally. In map 2 at 125mph it would cut out on me for a split second and throw a drivetrain malfunction.. so I had to always run it in map 1.

Map 2 with what mods ?

Apparently M2's like JB4 best in BEF mode with or wo BEF

[Maks///M2]

Originally Posted by Bee Pee

Map 2 with what mods ?

Apparently M2's like JB4 best in BEF mode with or wo BEF

Dp, intercooler, intake, exhaust.

I took it in a dyne and the same thing happened on the dyno. So I just switched it to map on and drive around on it that way

[Maks///M2]

So I heard back from Bmw today... and the total is 3700 for a new dme... so they ordered one.. and I can not wait to have the car back!