I resolved this problem about a year ago by replacing the "Ignition Timing Reference Sensor". This part is discussed in the "Ignition System" section of the Bentley manual (page 28.29). The part can be visually found on the drivers side of the motor. It is below and slightly in front of the mineral oil reservoir - at about the seam between the engine block and transmission - on the engine block side by about 1/2". It has one black wire coming out of it. The part has a round barrel-shaped cyllinder that fits down inside of the block to 'sense' the flywheel position so that the ignition timing is in synch.
Mine was 'failing' when the car would not warm start - as mentioned above - and did not present the 2-1-1-2 diagnostic code (Bentley p. 28.33) until the part completely failed - the car would not start at all - warm or cold. When I removed the sensor the cylinder had a broken seal and could easily be turned by hand. There were no other visual indications that the part had failed.
The car has been starting cold and warm ever since. I am now battling various leaks - otherwise all things are fine.
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