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Old 02-01-2018, 05:10 PM
BillGrissom BillGrissom is offline
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Join Date: Aug 2010
Location: Sacramento, CA
Posts: 2,482
It takes 1 min to check resistance of my glow plugs in my 300D's, so should take 4/5 min for the OP's 240D. I do it every time I change the oil, or my son brings one home. I found one bad GP last time, which improved cold starts. Please report back since others are reading and using this info.

An air suction leak would be there all the time, or perhaps worse when hot. A clogged strainer would affect flow immediately since the fuel is incompressible. Since it idled fine once warm, it sounds like a bad GP and/or low compression is most likely.
1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans
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