I have an odd problem that only occurs occaisionally in my 83 300D. At times if I leave the key in position 2 for more than a few seconds after the glow plug light goes out and the buzzer stops, the key won't turn to position 3 to start the car. If I then go back and start over and turn to postion 3 right after the light goes out, no problem. The previous owner had an extra push button installed to manually run the glowplugs, but I'd rather find out why the problem is there to begin with. Is it just a worn ignition switch or indicative of something more involved to fix? I thought you could wait up to 45 seconds after the light goes off to start the car.