1992 300 E 187K + miles. After getting to operating temp or more(80 C) the engine will start to sputter, tach drops out and engine stalls. After cooling down with hood up for a few minutes it will restart, but dies in a few minutes again.

No check engine lite on first test drive.

checked codes. CIS-E MAS code 17 - "O2 sensor signal wire shorted to ground or positive". I cleared that code and it did not reset even after the vehicle stalled several times.

Replaced dist. cap, rotor, wires and plugs as a matter of routine maintenance. I removed the Ignition control (I/C) module and cleaned off the old dielectric heat sink paste and installed a new coat on the bottom of the module and on the fender.

Re checked for code after stalling fit and check engine lite came on.

Code 7- "TNA signal-(rpm signal) at CIS-E control unit N3 implausible".

I dont have MBZ scan tool. The best I can figure is that either the crankshaft position or reference sensor is faulty or the IC(EZL) module is shorting internally from heat. I was starting to suspect the possibilty that the coil was shorting out-before it set this code 7.

Right now I'm am trying to find best prices on used parts for testing or maybe some one "parting out" locally of a 300 E. The module and actually all these parts are damn expensive.

I'm in LA county, CA.

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1982 MBZ 300SD Turbo Diesel- just turned 200,000- just breaking her in