[stickle1212]

Here is the link to the codes that I'm currently seeing:
https://docs.google.com/document/d/1...it?usp=sharing

• Things that were done before the problem was noticed
  Fluid changes for Transmission, Differential, and Transfer Case
  Valve Cover Gasket
  Replaced lover intake boot with a newer design that connects to PCV port.
  

• Things that I've done after problems started to occur
  Changed Fuel pump and sending unit
  changed Transfer Case fluid, there were no issues for a day (I thought the problem was fixed)
  Performed Transfer case procedure (Snap-On), the problem returned.
  Replaced Transfer case actuator motor

Observations:
Whenever the issue occurs the 4X4 light sometimes comes on and stays on until the vehicle is restarted. The CEL sometimes comes on but only for a seconds. The only way to replicate the rapid momentary drop in RPM is to quickly release the clutch and press it again. You may not be able to tell from the video I posted, but the drag is violent. (don't think that relevant)
After the code is cleared and re-read, everything on the list comes back with the exception of 54c6 which comes on after I drive for a bit.

I will try to turn off the traction control as was suggested and see if the problem occurs.
I'm trying to get the logging software to see if it can provide some insight into what is causing the issue. Besides changing the Transfer case, I'm out of options.

[Brian86]

We've circled back to:

Remove the front driveshaft and see if the problem persists.

The car should drive normally, pretty much indefinitely, w/o the front driveshaft in. The car doesn't have any way to know it's missing unless you start spinning the rear wheels.

[e90yyc]

Yes, let us know whether it occurs with DSC off.

Be aware that if you drive quickly around corners with your front driveshaft out, DSC will probably cut throttle, even if you aren’t really slipping. Normal behaviour if you notice this.

[stickle1212]

Update....
Turn of DSC
Remove front driveshaft

The problem still persists!!

So frustrating, I'm out of ideas.

[eljay]

As mentioned before, this does not seem to be a mechanical problem.
Something is causing a cut in communication to the DME and that shuts down the engine momentarily and abruptly causing the feeling of violent decceleration. The tach needle drop is a symptom of the electrical problem. Engine cannot go from few thousand revolution to a full stop like that mechanically or all wheels would lock up and you'd be thrown through the windshield (hopefully, not as you are wearing a seat belt!).

Those multiple electrical faults on the passenger side of the car have something to do with this, methinks.

[Tambohamilton]

Yeah, agreed. I'd be looking for water damage, damaged wires, corrosion, etc etc.

[nsjames]

valve cover gasket was done.
bets on pinched wire causing the DME to shut off?

have you looked for pinched wires yet?
it's not the transfer case. Something disrupts your DME, I'd nearly guarantee it.

[e90yyc]

Does the issue seem to relate only to a shift in weight distribution? As in, if you get on the throttle more gradually, eventually landing at WOT or close to, versus just jamming the pedal down, does that make any difference?

[stickle1212]

Gradual acceleration is fine, I can go all the way up to 100 or more. The problem is when I floor it rapidly.

[stickle1212]

1. Things that were done today
   remove front driveshaft (problem)
   Inspected all the way around the valve cover for pinched wire (none found)
   Inspected abs module under the front passenger seat (exterior had watermarks but no internal breach or connector damage)
   Removed DME connectors and reconnect. (no water damage)

1. To Do
   Remove and inspect module below fusebox

Observation:
For the first 2 to 3 min of driving after being parked for a prolonged period, I can gas as hard as I want without an issue. The acceleration also seems quite sluggish (may be in my head)


Any more suggestions??

[Brian86]

The symptoms not happening when the car is cold could be a clue.

When the car is cold it runs on 'open loop' mode. In that it ignores the O2 sensors for fuel trim and only delivers fuel via the mass airflow sensor.

Once it warms up it begins monitoring the upstream O2 sensors to fine-tune the fuel trim.

Perhaps O2 sensor wiring?

As per usual, just a suggestion, I really have no idea what's malfunctioning.

---------------

*Ninja Edit

Not to mention the O2 sensor heating circuit is only active for a brief period after a cold start.

[nsjames]

have checked the 02 wiring isn't hitting manifold?

inpa and testo.
you need more data and you need to know what the DME is seeing and doing.

[stickle1212]

I'll try to get test0 today. Any recommended sites where it can be downloaded? I did follow the ) o2 sensors end to end and they seem fine. A bit of oil on the connectors near the oil pan but that's it.

[nsjames]

Originally Posted by stickle1212

I'll try to get test0 today. Any recommended sites where it can be downloaded? I did follow the ) o2 sensors end to end and they seem fine. A bit of oil on the connectors near the oil pan but that's it.

find the post by pheno.

if you have a working inpa version you want te non standalone version and it will use your existing ediabas and datens and such.

[stickle1212]

nsjames I've got test0 up and running however I don't know what metrics to capture.

I also noticed that I can go through the full RPM in 1 st and 2nd gear without any issues.

Yesterday I replaced the JBE (because it was cheap) and I thought the problem was fixed because I drove for about 4 hrs without an incident, however, the problem returned in the midst of my victory lap.

Does anyone want to take the challenge of fixing my car? I'll ship it to you lol. I really don't know any local mechanic capable of fixing this level of problem

[e90yyc]

Originally Posted by stickle1212

…the problem returned in the midst of my victory lap.

Do I ever know that feeling, haha… The worst.

Man, I wish there was something I could do to help you but your problem is a real head-scratcher. While your issue is undoubtedly more severe than what I’m experiencing with lack of cruise control and weird DSC cut-ins, there are enough similarities that I’m very curious what the outcome of this will be.

The first thing I did when I first experienced my issue was go back and check allll the wiring I possibly could. Of course that was after I went for the low-hanging fruit and struck out, but might be worth triple-checking any wires you might have disturbed with work you’ve done. Maybe you’ve done that already—not sure.

The thing I most wish I had was a tool to log data. Sure TestO does this but I have yet to figure out how to log what I actually need, and powerful as it may be, the learning curve is somewhat steep and the interface not the most user friendly. What should you be logging? I have no f*cking clue to be honest. In my case I wanted to see wheel speeds, but I seriously doubt the ABS sensors have anything to do with your issue. At this point in the troubleshooting process having the right data is basically essential.

I used to work at a BMW dealership, and this is the type of issue I’d expect them to bring/fly in a regional or national expert for. Someone who is highly technical (more engineer than mechanic). But, I can’t even fathom how many hours of labour you’d be on the hook for in the end. Obviously they would first try to solve it locally and only after everyone there fails would they even considering bringing in the kind of person I describe.

[stickle1212]

Hi can someone please send me a D/L link to insta-p I'm having a hard time finding one on google (not spammed). lol

[Tambohamilton]

Look for j0k3r5 software help yourself part 2 thread on here

[eljay]

Originally Posted by stickle1212

nsjames I've got test0 up and running however I don't know what metrics to capture.

I also noticed that I can go through the full RPM in 1 st and 2nd gear without any issues.

Yesterday I replaced the JBE (because it was cheap) and I thought the problem was fixed because I drove for about 4 hrs without an incident, however, the problem returned in the midst of my victory lap.

Does anyone want to take the challenge of fixing my car? I'll ship it to you lol. I really don't know any local mechanic capable of fixing this level of problem

While I have no idea what to log, I would just do some basics like A/F ratio, throttle position, etc and I am curious whether the logging just stops when the problem appears and DME stops controlling the engine.

[nsjames]

I would set it up to log the RPM and all crank/cam angle sensors first go.

[ctuna]

Most of the links you will ever need inside the attached.
The coding sub forum is a good place to look for and be educated
about all things diagnostic and all programming options.

[eljay]

Originally Posted by nsjames

I would set it up to log the RPM and all crank/cam angle sensors first go.

Good suggestions!