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Loxsl Loxsl is offline
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Join Date: Aug 2019
Car: 08 335i
Default High RPM Power Cut - 08-09-2019, 08:26 AM

Hi,

So I was on my way to work cruising on the highway when I had the car buck and go into limp mode. Codes were 2A94 and 3100. I figured just a bad crank sensor so I replaced it and took a few small errands and all seemed good.

However when I try to do a full throttle pull it cuts out for a second then comes back strong. Sometimes it doesn't throw any codes or do anything but that. Other times it throws the same 2A94 and 3100.

Also noticed the gauges sweep again when it picks back up.

I data logged on my way to my friends and got 2 files. 1859 is on the way there on the highway when it randomly cut out and got codes again.

1930 is a pull in 2nd which cut out but gave no codes.

I'm at a loss here. I checked the wiring to the CPS and that the JB4 is all connected solidly.

My concern is the total signal loss in the logs. Maybe a short somewhere?

help!!!
Attached Files
File Type: csv 190713_1859.csv (19.6 KB, 8 views)
File Type: csv 190713_1930.csv (5.9 KB, 6 views)
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codesx codesx is offline
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Posts: 661
Join Date: Feb 2018
Car: 2008 335i Vert (E93, N54)
Default 08-09-2019, 09:55 AM

Hey Loxsl,

Not really great logs... maybe we can get another.
Looking at the short one where you do accelerate briefly, I don't see anything standing out.

Boost is a bit below target, but it's a really short burst.

HPFP and LPFP look good, Trims are OK, WGDC look normal.

Again, the log is so short though, it's hard to determine anything.
I don't see a 'hesitation' per what is described.

Suggestion;
- Enable 6 Cyl logging
- Obtain a Manually Triggered log (safety first)
-- Log in 3rd gear, Traction Control fully OFF
-- Start logging 2 seconds before going WOT
-- Hold WOT from 2000 to 7000 RPM

With the above, we should be able to see the hiccup when going WOT.
We'll also be able to see if there is something generally wrong with the tune and performance.


----

2008 335i Convertible, E93, N54, A/T (190,000+ km)
Wheels: 322 | Tires: R.275/35r18, F.245/40r18
TUNE: JB4 Map 6 | RACE BEF | 94 Octane | @19 PSI
BMS JB4 | BMS WMI @ 60/40 (CM10) | BMS 5" FMIC | BMS OCC | BMS DCI | BMS Cowel Filters
xHP Stage 3 (v2.0)
VRSF CP | HKS BOV
RB PCV Valve
NGK 5992 Plugs @ .020

Maintenance:
2018 - A/T Replaced | Plugs | Ign Coils | Walnut Blasting
2019 - VCG | OFHG & O-rings | Alternator w/ Clutch Pulley | Water Pump & T Stat
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Loxsl Loxsl is offline
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Join Date: Aug 2019
Car: 08 335i
Default 08-09-2019, 01:18 PM

Here is a log in 3rd gear. I just realized I still had traction control on but I'm sure that isn't the issue.

I went from around 3200 rpm to 4500 but didn't go further as it was cutting out a good bit. Did it like 3 times.

I'll try and get a longer one if needed but man it just feels wrong trying to get any further then that.
Attached Files
File Type: csv 190809_1609.csv (6.6 KB, 8 views)
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(#4)
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codesx codesx is offline
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Posts: 661
Join Date: Feb 2018
Car: 2008 335i Vert (E93, N54)
Default 08-09-2019, 04:30 PM

Quote:
Originally Posted by Loxsl
Here is a log in 3rd gear. I just realized I still had traction control on but I'm sure that isn't the issue.

I went from around 3200 rpm to 4500 but didn't go further as it was cutting out a good bit. Did it like 3 times.

I'll try and get a longer one if needed but man it just feels wrong trying to get any further then that.

Hey Loxsl,

Something is off. I agree don't push it.
Even the log is cutting in and out.
I'd recommend Map 4 (Safety, but still logs, unlike Map 0) until addressed.

I'm hoping more, wiser people will chime in.
I can't help but wonder if there is a bad connection with the JB4 interfacing.

Are you wired to the JB4 for logging, or over Bluetooth?
(I had logging issues (no other symptom) when my phone was out of range, so I moved my Transceiver into the cabin. Flawless since)

How long ago was the JB4 installed?
Has water gotten in the DME box?

Do you only get a hiccup on initial throttle?
If so, what percentage introduces it?
Can you rev up at 30% throttle with no issues?

Trying to get a better picture.
Also to determine if odd logging is related or due to Bluetooth.

You must have played to collect more context.
Share lots, all point form for easy reading.


----

2008 335i Convertible, E93, N54, A/T (190,000+ km)
Wheels: 322 | Tires: R.275/35r18, F.245/40r18
TUNE: JB4 Map 6 | RACE BEF | 94 Octane | @19 PSI
BMS JB4 | BMS WMI @ 60/40 (CM10) | BMS 5" FMIC | BMS OCC | BMS DCI | BMS Cowel Filters
xHP Stage 3 (v2.0)
VRSF CP | HKS BOV
RB PCV Valve
NGK 5992 Plugs @ .020

Maintenance:
2018 - A/T Replaced | Plugs | Ign Coils | Walnut Blasting
2019 - VCG | OFHG & O-rings | Alternator w/ Clutch Pulley | Water Pump & T Stat
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Loxsl Loxsl is offline
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Posts: 4
Join Date: Aug 2019
Car: 08 335i
Default 08-09-2019, 04:55 PM

Quote:
Originally Posted by codesx
Hey Loxsl,

Something is off. I agree don't push it.
Even the log is cutting in and out.
I'd recommend Map 4 (Safety, but still logs, unlike Map 0) until addressed.

I'm hoping more, wiser people will chime in.
I can't help but wonder if there is a bad connection with the JB4 interfacing.

Are you wired to the JB4 for logging, or over Bluetooth?
(I had logging issues (no other symptom) when my phone was out of range, so I moved my Transceiver into the cabin. Flawless since)

How long ago was the JB4 installed?
Has water gotten in the DME box?

Do you only get a hiccup on initial throttle?
If so, what percentage introduces it?
Can you rev up at 30% throttle with no issues?

Trying to get a better picture.
Also to determine if odd logging is related or due to Bluetooth.

You must have played to collect more context.
Share lots, all point form for easy reading.
  • So it seems to not do it initially when the car is cold. Once it starts to warm up I notice the hiccup.
  • It occasionally does it when under normal driving and always under hard accel usually in the higher rpm
  • Throttle % is varied but usually above 50
  • Doesn't look like there is any water anywhere it shouldn't be
  • I double checked the plugs on the DME and JB4 to make sure they were not loose.
  • I have had the tuner on for about a year.
  • I am currently wired into the JB4 for logging.

The fact that the log cuts out and I even see the gauges sweep as it hiccups makes me think the JB4 or DME is losing power or something. I'm hella stuck
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Loxsl Loxsl is offline
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Posts: 4
Join Date: Aug 2019
Car: 08 335i
Default 08-10-2019, 03:03 PM

Some additional info...

It mostly happens when it is above 2k rpm and when accelerating. however it does happen occasionally below that.

When it is cold, like sits overnight cold not just below oil gauge reading it seems to not do it.

I took the JB4 off to see if that was the issue and the problem persists.

I'm beginning to suspect the DME but have not gotten any good data to say anything for sure.

Getting super frustrated!!!!
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Dave @ BMS/Fuel-It!'s Avatar
Dave @ BMS/Fuel-It! Dave @ BMS/Fuel-It! is offline
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Posts: 5,432
Join Date: Apr 2014
Car: E92 335XI
Default 08-10-2019, 03:52 PM

To me this screams a connectivity issue- something looks to be loose or is coming loose



http://www.fuel-it.biz/

e92 AT 335xi 2.0
Doc Race Kit 6062
Fuel-It!Platinum DIY PI Kit + Stage 2BL
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