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-   -   JB4 Switches to Map 4 during WOT Ė Troubleshooting Support Requested (https://www.n54tech.com/forums/showthread.php?t=54216)

Metanoia 07-22-2018 12:36 PM

JB4 Switches to Map 4 during WOT Ė Troubleshooting Support Requested
 
2 Attachment(s)
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.

Dave @ BMS/Fuel-It! 07-22-2018 10:15 PM

Quote:

Originally Posted by Metanoia (Post )
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.

Hi, first welcome :)

Timing doesnít look great- not shocked given the 91 octane.

You could definitely benefit from the BEF, that will help a few things, your trims being one.

My advice- enable 6 cyl logging via your user adjustment page, load the pump BEF- and letís relog map 1

Metanoia 07-23-2018 08:02 PM

Hi Dave. Thanks for the advice, and the welcome! I've spent a fair amount of time reading this forum but haven't posted much... still much to learn. BTW, saw your 10.9 post on BB - nicely done!

Anyways, I do have a BT scan tool, so I'll be using it to install the BEF. I've downloaded the BimmerBoost App, and the latest BEF map templates, but won't be able to do the install until Thursday night. I'll enable 6 cylinder logging and keep you posted with how things go.

How does the BEF help with lower octane fuel and trims?

Dave @ BMS/Fuel-It! 07-23-2018 10:32 PM

Quote:

Originally Posted by Metanoia (Post )
Hi Dave. Thanks for the advice, and the welcome! I've spent a fair amount of time reading this forum but haven't posted much... still much to learn. BTW, saw your 10.9 post on BB - nicely done!

Anyways, I do have a BT scan tool, so I'll be using it to install the BEF. I've downloaded the BimmerBoost App, and the latest BEF map templates, but won't be able to do the install until Thursday night. I'll enable 6 cylinder logging and keep you posted with how things go.

How does the BEF help with lower octane fuel and trims?

Sounds good!

In regards to the benefits of the BEF, it allows the JB4 to control boost, & allows the BEF/flash to control trims, fueling, timing, vanos etc.

Metanoia 09-16-2019 09:06 PM

New Logs to an old post :-)
 
1 Attachment(s)
Hello N54Tech team. Since last posting, I have installed the pump BEF, and the car has been running great on map 1 for over a year. However, recently, I have been experiencing some issues that I was hoping you could help me troubleshoot.

When I go WOT, the car pulls the tune and reverts to map 4. This has been occurring regardless of whether using 91 or 94 octane. The attached logs are using 91 octane. Recent modifications have been made to support Map 2 (upgraded FMIC, exhaust), however, I have not tried Map 2 due to the issues experienced.

My initial review of the logs:
1. AFR seems high at WOT (going as high as 16.6)
2. The car pulls timing quickly (down to 3deg at 2523 rpm)
3. Fuel pressure seems to be ok for both hp and lp.

The car has approximately 30,000 miles since the last time I have walnut-shell blasted the intake, however, does have recent spark plugs (OEM). I will be doing the blasting in the next weekend or two.

I appreciate any guidance you can offer. Thanks so much!


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