OK, I'm under the hood of the 300td again today (finally).

I have a plastic bottle of fresh diesel fuel, and I've routed the supply and return hoses into it. I bled the system with the plunger and saw the air bubbles come out (and a bit of dark fuel).

I checked the glow plugs again. I am getting voltage at the glow plug terminal. And at the terminal I read 1.9-2.0 ohms on each glow plug, which IIRC is OK.

It had good enough compression and timing when I parked it to start and drive fine.

It still won't start... what else should I try?