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Could be tight valves....valve adjustment is probably needed if it has been done recently.
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Valves were adjusted in August. Usually tight valves will show up at even higher temps, in my experience.
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Could be a single bad plug. My daughter's 84SD with a relatively new engine won't fire below about 20 degrees with one plug out. I'd also use PowerService anti-gel if temperatures were consistently that low.
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I had not thought of the single bad plug angle, I was banging my head on how an entire set of plugs could be no good. Will check them with a meter tomorrow when cold.
The Diesel 911 I used is the PowerService product they sell here for ungelling fuel (you can get an even stronger one from heavy equipment dealers that guarantees complete degel in 20 minutes). I guess I could add more now.
I suppose I could try filling up somewhere else too, though I would wonder how the station I am using could have that much water in their diesel tank. They're relatively busy, and installed new tanks six months ago.