So I have according to receipts and maint log,
New Motor Mounts
New Delphi wiring harness
All new return fuel lines and prefilter/orings/fuel filter.
No blowby, you can remove oil cap and leave it loose on there with no air escaping.

Leaves me to wonder about those nozzles or delivery valves. I should do the water test and take a video to see if I am just used to newer V6 diesels that are electric motor smooth. I just think the idle should be almost vibe free?


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1995 E300 (W124)
1999 ML430 (w163)
2011 GL350 (x164)
2016 Sprinter 144" 4X4 lowtop (906)
2004 E500 (W211) 4matic Wagon (Gold)
2004 E500 (W211) 4matic Wagon Avantgarde (silver)

Regardless of having orings replaced in the placed, air in the fuel supply system is still the primary candidate to inspect first. Very simple- using a small flashlight, backlight the clear hoses when the engine is running. rev the engine a little while doing this. look for air.


at 288k miles, injectors should probably be replaced on principle if thought to be original, I agree.

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If the delivery valve o-rings are original, definitely take a look at those as well.

I did my original DV o-rings at around 150k and it did cure my lumpy idle, as well as small occasional fuel leaks at the IP. They can be a bit annoying to change, but definitely can make a big difference in how the engine runs.

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1995 E300 Diesel
~300k