So this morning I went out and got another OEM Mercedes sensor thinking maybe I got a bad one the first time. Installed it and the car drove great. Even changed the coolant on it.

Drove it around for about 45 minutes and all was well. Parked it, came out after about an hour and it started right up. Went and mowed the lawn. Came back about an hour and a half later and no start/ This time I had my OBD2 scanner on it and it was counting rpms while cranking so I guess its not the sensor.

Thought about swapping relays for the fuel pump. Swapped one from the front SAM and guess what...it fired right up. Thought maybe I was onto something.

Drove to the grocery store (about 15 minutes), shopped for about 20 minutes, came out and guess what.....no start. So this time I went inside the grocery, bought a ice cold water, came out and tired starting it (it wouldn't start) so I poured a nice cold bottle of water on the ecm. Got back in the car and it started right up!


Drove home, came inside, checked emails, posted some updates, and went back outside with a cooler and a cold bottle of water. Got in and it started right up. Drove anout 20 minutes. Went inside to shop for about 20 minutes. Armed with a cold bottle of water, came outside and it.....fired right up.

So now its sitting outside and I will let it sit for about an hour and see what happens.

Would love some guesses.