My neighbor had the same problem in a E300D and he never bothered to adjust the valves! Adjusting them did help, but now compression is low and the car failed a leakdown test!!! Needs a valve job!!

Just curious ... why does the 602 in the E300D need valve adjustments, but not the 603? Since the E300D was a later model, wouldn't they want to use the adjustment-free technology? Was is it exactly about the 603 that kills the need for adjustments? Sorry to hijack the thread ... I'm just a habitual question-asker.

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)

OK, replaceing the GPs cured the no start issue, but tightening the fuel filter didn't resolve the idle problem. Didn't have time to adjust the damper screw, little lady had to leave for work. I'll try that later today and see if it'll idle in the morning. Thanks for all of the suggestions, keep them coming.
Jeff

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1971 R600 Mack toterhome (SuperDawg)
99 NU-WA Snowbird 34+2 SE 102 5er
If it's not diesel, it's not in my stable!
53 F100 617.951/auto
95 Dodge 3500 Cummins/5 speed service truck

i must not be fussy enuf because i dont expect any diesel to start and idle like a gasser when the temps get to the teens I have or had most every diesel known to man in cars trucks boats gen sets bulldozers cranes etc i start em run the idle up 2 min later they are running smooth Except when it was below zero and we had to put the torch on the oil pan of the bulldozer
My significant other is a lot of work too her having to unplug the block heater causes me pain

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commercial fisherman diesel in my blood in my boats trucks and Dear old Dad has had me drivin them since i got my first license in 1968
1986 300 SDL 427654
1999 Chevy Crew Cab Dually 225423
1986 300 SDL 287000 Dad's
1987 190 Turbo 158000 Mom's (my inheritance)