Barndoor:

No pic, didn't come through. What color is "from being too hot"?

Dark color at the base would indicate rich rather than lean running.

Bright white with blisters on the ceramic or fused on crud indicates lean running (vac leak).

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!