hello, hope you all are well. i just replaced the glow plugs in my wifes car (99 E300D), and it is still stumbling when starting. i also noticed the clear fuel lines have foamy air bubbles with lots of movement in them when it is running.


my 92 300d doesnt do that, not sure if it's related....



could you guys suggest a few other things to check for the cold start stumble?

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'92 300D 2.5
'99 E300TD

Fix the air ingress problem. There are lots of threads documenting problems with the OM606 plumbing. It uses plastic fittings and O-rings to seal and is a source of lots of air ingress problems.

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

I would replace all of the fuel o rings as soon as possible. I ignored mine like an idiot and it eventually turned into a crank no start.

OM606.962 o-ring size

Be careful removing intake manifold bolts, I would soak them with Deep Creep every day for a week. Two of my intake manifold bolts snapped on me.

Other than that it's a doable job.

You might as well do the delivery valves as well.

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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.

Did you check to make sure the gp’s are getting power. The module fails often at this age