I know your pain you feel with your 300E...mine is loading up, possibly the seal under the fuel dist. (not o-ring, but leaking seal). On cold start (attempts that is - lets not get happy here thing this thing would crank ) it will almost sound like cranking, then simply spins over. When the spark plugs are removed and cleaned & dried, it will crank again, but only if I dry the plugs, and spin the engine over while the plugs are removed. My air flow meter chamber is wet also...too wet...too much fuel, fouling the plugs.

This process is getting old....disconnected O2 sensor did no change...EHA disconnected no change, adjusted air flow meter plate, no change. Like Steve said earlier, it is getting too much fuel. I will be looking into it tommorow, after buying plugs to plug off the injectors and pressure test the fuel dist. for leaks on the underside (with 7 & 8 pins shorted in the fuel pump relay plug).

I just bought a cool domain name pertaining to fixing your Mercedes.....it's http://www.fixmymercedes.com and it will be up & running soon ....within a few days....maybe I'll post photos and technical data concerning the issues I have had with my 300E!

Top of the day to ya!