N54Tech.com - International Turbo Racing Discussion
Prev Previous Post   Next Post Next
Metanoia Metanoia is offline
New Member
Posts: 6
Join Date: Sep 2017
Car: 2008 BMW 335xi
Default JB4 Switches to Map 4 during WOT Ė Troubleshooting Support Requested - 07-22-2018, 12:36 PM

Hello. I have a 2008 N54 powered BMW 335xi with BMS DCI, JB4 G5 ISO, ER charge pipe, Forge DVís with yellow springs (15-23lbs) manual transmission, and use Shell 91 fuel. The vehicle has about 59,000 miles on it. Within the last 10,000 miles, I have performed a walnut shell blast of the intake, and replaced my spark plugs and coil packs (done at the same time as the JB4 install). I would like to install the pump gas BEF, but want to first ensure that the car is running perfect.

When doing first-second-third gear pulls at WOT on JB4 map 1, I have been experiencing hesitation in 3rd gear at around 4500 RPM, and the JB4 switches to map 4. Using my BT scan tool, the following codes were identified as shadow codes and did not throw a check engine light:
- 30EF glow ignition, cylinder 3, 4832rpm, IAT 48 deg. C, engine temp 100.5 deg. C
- 30F2 glow ignition cylinder 6, 4608rpm, IAT. 48 deg. C, engine temp 100.5 deg. C
- 30F1 glow ignition cylinder 5, 4800rpm, IAT 48.75 deg. C, engine temp 100.5 deg.
Additional shadow codes thrown today while pulling logs include:
- 29F2 Fuel high pressure system, fuel pressure, rail pressure 103,247 hPa, PWM-Signal of mass control valve 57.42%, injected mass of fuel 108L/hr
- 29E2 Fuel injection rail, pressure sensor signal, 5600rpm, rail pressure 5434 hPa, voltage of fuel pressure sensor before mass control valve = 2.73Vm, average rail pressure 0.27V

I took some logs today (this is my first time doing data logging, so I will need some help pinpointing my issues). Based on what I have read, I believe that there may be a number of issues including: IATís too high (up from 91F at to 132F), octane too low (identified by shadow codes), or an oxygen sensor issue (based on the 4500rpm JB4 switch to 3rd gear). Timing appears to be pulled aggressively.

While pulling the logs today, during one pull, the engine went into limp mode. I pulled over and shut off the car and saved the log.

Can you help me pinpoint what is wrong with the car/what I need to fix? Thanks so much.
Attached Images
File Type: pdf (2018-07-22) Shadow Fault Codes.pdf (384.1 KB, 196 views)
Attached Files
File Type: csv 180722_1207.csv (33.3 KB, 82 views)
Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

vBulletin Skin developed by: vBStyles.com
Copyright © 2007 - 2020, N54tech.com