Jerky under Hard Acceleration and 4wd/PSM Fault

[Just_Dirty]

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Under hard acceleration Im getting a jerky sensation as if a plug or coil is bad. Occasionally this will be followed by a 4WD malfunction and PSM being disabled. I tried to get the codes read but the 4wd and PSM malfunction reset after each key cycle so the car had no stored codes(at last not codes that could be detected with an Oreilly OBD2 code reader).

I pulled the plugs and they looked fine as did the coils and i'm also not getting any misfire codes or CEL.

Has anyone had these issues? Is this transfer case stepper motor malfunction? control module? or a new T-Case?

[lewisweller]

On 07/02/2017 at 11:03 PM, Just_Dirty said:

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Under hard acceleration Im getting a jerky sensation as if a plug or coil is bad. Occasionally this will be followed by a 4WD malfunction and PSM being disabled. I tried to get the codes read but the 4wd and PSM malfunction reset after each key cycle so the car had no stored codes(at last not codes that could be detected with an Oreilly OBD2 code reader).

I pulled the plugs and they looked fine as did the coils and i'm also not getting any misfire codes or CEL.

Has anyone had these issues? Is this transfer case stepper motor malfunction? control module? or a new T-Case?

Hello, you may have been reading some of the post which related to my issues of stuttering and Jerkiness under acceleration and idle Dip when pulling to a stop which developed more recently. This all happens when engine is warm/hot but it runs perfect when cold about 5 mins in dubai weather. 

So my question to you is when you start from dead cold does it jerk? Does the jerk get worse after you are at full temp and you sit and idle for a while then drive off it will jerk bad? How does the engine respond to slow speed light throttle conditions? 

 

I also get "four wheel drive faulty" warning at random times. But never had a psm fault and never any codes related either. 

 

You should try and get the codes read when faulty psm is on, these faults tend not to throw a code unfortunately and a key cycle will reset them. 

[lewisweller]

I see your post on Rennlist about this. 

I'm also reading on Bimmer forum the X3 has transfer case issues which produces Jerky acceleration!. 

The clunk or "Release Thump" I have is mentioned in the tsb attached. 

 

Could it be the jerks (stuttering) and thumps all are related to the transfer case and a update tcu module will fix all these problems? I can verify that I have the newer revision "C" stepper motor (older 03-04 maybe 05 cayenne need newer stepper motors apparently) so from my understanding only a newer revision control module is required to alleviate the issue. "Plug and play" in this instance apparently. 

 

Can someone share their experiences of fixing this transfer case issue please. 

Edited February 21, 2017 by lewisweller