Quote:
Originally Posted by gransport66
Thanks guys, this is all good info. As for the Overload relay and fuel pump relay they are supposed to be new Mercedes parts. Back to the issue of it dieing the owner tells me it is very sudden without a hint of a warning, just exactly like someone reached over and turned the key. I have been driving the car for a day and a half now and have tried wiggleing the key to no avail. I will keep driving/checking on the car to see if anything comes up. Thanks again, Andrew
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That symptom sounds just like the engine speed sensor is faulty. I don't know if the '89 MY had a cam position sensor or still uses the TD signal sensor, but something is telling the ECU what the engine speed is, and that may be faulty. If the engine speed signal is lost for 1 second, the fuel pump relay shuts off the fuel pumps, and creates the very situation you're describing--like someone reached over and switched off the ignition.