About every 6 months, when I go to start my '98 E430 (hot or cold), it will start and run for 0.5 seconds then just die. I can try and try again with the same results. If I wait 10-15 minutes, it will start and run fine. Then about 6 months later, the problem will come back. The car will actually run for a moment, not just crank, so it seems like it is getting a small burst of fuel, but that's all. I can try to start it 15 times with the same results. Just waiting is the only answer. My dealers knows of no specific problem. I have looked at several forums, some mention a possible fuel pump relay. If you have any other ideas you think I could look into, I would certainly appreciate it.

That engine & the V6 engine starting in 1998 have issues with the flywheel crank sensor... sounds like you may too have that problem!

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It sounds like the Drive Authorization System (DAS) is intervening. It will set a fault code if this is the case. The problem may only be a faulty key. Try using your other key and see what happens.

Regarding the DAS, it is interesting you mention a faulty key. The problem previously only occurred with me but about a month ago, I gave my key to my wife and then it happened to her. If a fault code is set, I assume no dash indicator but I would be able to read it with a reader? Also, if it is the key, would that make the key unreliable OR could I reprogram the car to read the key and this would possibly cure the problem? Your suggestions greatly appreciated.

The fault code is "P1570/Das enable not sent" and it will be stored in the engine control module. No warning/malfunction lights will come on. The key can't be re-programmed to correct a DAS problem. You should always have at least two working keys for a DAS equipped MB. Sometimes the keys can fail outright, and if you only have one you're stuck!!! Also, keep in mind that other DAS components can fail, not jusy keys.