Since no one volunteered their expert advice on the crankshaft position sensor (CPS) DIY, here it is...hopefully this will help others with what appears to be a common stalling issue in the ML series.

I checked NetStar for PO work (done under warranty) and learned the fuel system mod had been done at 29k (now have 48k). So I figured the stalling issue wasn't that. I may be wrong, the CPS was cheaper place to start!

I give this job a 1 to 1.5 stars (of 5) difficulty, and maybe a 3 stars for patience.

Here it is:

1) Get CPS at dealer, its a VIN specific part. $125 from my local stealer.

2) Tools needed: Socket screwdriver, Good lighting (portable) shop lights, size 8 outside torx socket, maybe a ratchet and extentions depending on your flexibility, magnetic part retrieval tool (skip this at your peril), bath towel, and long sleeve shirt, step stool, blue thread locker (optional)

3) Open hood and remove engine cover, it just pulls off and on

4) Set work light(s) toward back of engine, lighting behind drivers cylinder head

5) Set bath towel on front of ML to kneel on of your knees will die, wearing long sleeve shirt or your wrists will be cut.

6) Climb up on towel and look behind engine from above and right (see .jpg), finding torx attachment holding your CPS.

7) Remove torx screw and pull out CPS, disconnect one way connector (wiring)

8) Replace with new (leaving wire detached for now)

9) This is the hardest step by far, and requires patience and flexibility. Apply some thread locker and insert screw and start the threads. Tighten with torx on socket screwdriver. This step took about 1/2 hour and numerous dropped screws and retrievals with mag tool.

10) Attach wiring to CPS

11) Reinstall engine cover

12) Clean up tools, towel and lights and everything

13) Drink beer and toast yourself for saving yourself at least $100 and a day of your time dropping off and picking up cars at shop

Hope this helps someone in the community.

Dickie
00 ML 320
97 328i
87 325is

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