Apparently the lifespan of the injectors is only around 100K as I understand. I just ordered up a set for the 420 (no start ) and plan to have the fuel dizzy rebuilt here too.

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

Leaking injectors flood the engine.

Cylinders don't necessarily recover at same rate, nor do injectors wear at same rate and flood cylinders at same rate.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles

I'll confirm the my 300se does it also. Mine is exactly as described by CARUSLE. Almost seems to be running on 3 or 4 cylinders then clears up one by one. Typically no more than 5 or 10 seconds. I also have a constant bumpy idle that you can just barely feel while in the car but is obvious when you put your hand on the valve cover.

just my 2 cents-replace the injectors. they do wear and any cleaning will expose how worn they are. 100k is about the life of any kjet injector, unless they've been cleaned with the pump tester every 30k. then you might get 150k but the exspense to get there was more than replacing injectors. good luck, chuck.

Ikchris, I think you have it. My symptoms fit slightly-leaky injectors perfectly.
- When cold, the leaky injectors have had time to deplete pressure, and also some fuel evaporates from the cylinders over that long period. And you need extra fuel anyway, so it fires right up like normal.
- on a short stop when warm, they don't have timne to leak down, so it's not noticeable.
- But when they sit a couple hours or more, that's the killer.

Makes sense.

Any way to do an easy leakdown check of the system, to at least see if we're on the right track? Course it could be leaking back from the fuel distributor also. On GM car's a leakdown is simple, don't know so much about these CIS systems.

Hmm, wonder if you vould let it sit the proper time, nick the engine over without starting it, and pull plugs to look for wet electrodes?

DG