And I am more than a little bit bummed that after all that trouble only one of them was bad.

They were MB Beru plugs but I doubt they were original.(232K miles)

I am still getting the grey smoke at startup that I thought was partly due to glow plug issues.

I am now suspecting that it's an injector problem.

I have new Monark injectors on their way from C. Sean Watts so if they are the culprits they won't be much longer.

After the engine warms up all the smoking goes away but I think it runs too loud in general(I don't have the bottom sound deadening capsule so that might be part of the problem.

I occasionally get what I consider a miss at idle while in gear like at a stop light or stop sign.

Outside of resetting my timing what other issues should I be looking at if the injectors don't resolve my smoking and rough running?

I would also like to say that I am getting 30mpg religiously now that I have switched to Mobil 1 Truck and SUV oil.

On the Rotella Synthetic I never got above 28 mpg driving exactly the same way and I also am using/leaking less with the thinner Mobil 1.

I wasn't having to add much to begin with but with the Mobil 1 I haven't added anything after 4K miles.

I know I am losing some from the IP because the gaskets are apparently shot.

I also suspect that I might be losing some via the Turbo.

I'm not sure which seal or whatever could leak oil into the intake air stream but there is a little bit and some of it makes it's way out the shaft where the butterfly valve used to be in the intake.

So, I am getting the best MPG I have ever gotten in this car, I have new glow plugs installed but it still runs noticeably rough at start up especially but also at idle.

I think it must be largely due to injector performance.

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1993 W124 300D
-297K on the clock as I type this.

When you changed the plugs out, did you ream the gp holes out?

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82 240D Manual 277K and still rolling!
02 Volvo S60 AWD For Sale

If everthing else was good a small Air leak could cause a rough Idle.

If the rebuilt Injectors do not cure the grey smoke I would be thinking of doing a compression test.
But, I have a feeling the Injectors will solve the problem if it has 232K miles on the origional Injectors. It would also be nice if they raised you milage a little more.

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84 300D, 82 Volvo 244Gl Diesel

What about valve guides/seals. Maybe they'd cause the initial smokey condition that clears up after a while?

I've never changed those myself... just an idea.

Codifex
1981 240D ChinaBlue (found an engine - hope it's good)
1983 300DTurbo w/sunroof

There's no blow-by that I can detect so compression might be OK.

I have plenty of power once it's warmed up.

I reamed them out using a drill bit about the same size as the tip of the glow plug.

I guess you could call it reaming.

I stuck it in there and knocked it around a bit.

There was hardly any carbon at all on the drill bit and I couldn't see any in there either.

What I did notice while I had the intake manifold off is that some of the intake valves had some oil/gunk on the shaft.

If I remember correctly it was the first, middle and last valves where I saw this.

It was also these three that had more blackness in the air inlets leading up to the valves.

I found that a bit odd.

If it had come from the EGR system before I had disabled it I would expect to see it in all of them but I only saw it in 1, 3 and 5.

The other two were very clean.

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1993 W124 300D
-297K on the clock as I type this.

The 1-3-5 Intake Valve "Oiliness" is either an Anomaly ,Or as has been suggested, Valve Seals.
[I'd hate to think they're the cause...with less than 300K]

Weirdness of Fluids in Intake tracts...They can "Backfeed".
(Only logical solution for yours)

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'84 300SD sold
124.128

There's not a lot of oil in the intake at all but there's a little.

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1993 W124 300D
-297K on the clock as I type this.