I've done the valves... No smoke when warm. Runs good instantly when plugged in. Just a few misses when started before it gets warm if not plugged in. Also, I've tested the glow plugs and they all measure around 0.8 ohm dc resistance. By the way it's the 617 turbo. It's an 84 300d. The plugs are new as of a few months ago. I think the previous owner used bosch plugs. Could it be that there is carbon built up and he didn't ream the plug holes when he replaced them??? Would this do this?
Thanks,
Nick

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Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's.