That was my assumption. I pulled them off of the top of the IP, and checked them. They looked fine. No gunk. The mechanic tried to say that the veggie system was the culprit here. I don't think so. I think it was the injectors which had never been replaced.

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1982 300CD (Veggie)
1975 240D
1986 190D (lost a bearing)
1982 240D (dead eng.)