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.