A few things:

1. Posting where you are and how cold it actually is, wouldn't hurt, in evaluating no-start problems (some areas are experiencing extreme temps). Also it would be helpful to know if the car starts okay down to a certain temperature.

2. You say the relay "looks okay". Is the glow light coming on on the dashboard? How many glow cycles do you do, before you try to start it?

3. I am guessing you didn't change the rearmost glowplug, as it is the most difficult. That alone should not produce a no-start problem.

4. Have the valves been adjusted recently? Correct valve adjustment is critical on these cars, for cold weather starts.

5. When you plug in the block heater, you should be able to hear a sizzling or crackling sound with 10 seconds as it starts to work. If you can't hear that, the heater probably needs to be replaced.

6. What oil is in the crankcase? If you are in an area experiencing severe cold, synthetic oil allows the motor to turn over much faster.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22