Oil plugs injector?

Pulling oil thru the crankcase breather isn't going to wind up mostly in cyls 1 & 2. If anything, the two center cylinders on each bank will get a bit more oil, if it even makes it thru the intercooler.

I can't see how it would plug injectors at all.

What are your symptoms? Other than having a severely plugged air filter, which would cause black smoke even if you weren't pulling oil from the crankcase.

Reggofcal said:

Also on my mod engine the engine crankcase breather is tied into the air intake right before the turbo than air goes through turbo has boost goes through air to air than feeds in to #1 and #2 cylinders

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Mod engine? On a stock 7.3L the crankcase breather is tied in before the turbo, which sends air (and oil vapor) thru the intercooler and into the intake plenums about midpoint of each cylinder bank, not at the front where 1 and 2 are.

It sounds to me like you have some serious issues. An injector gone bad could explain the white smoke and lost compression (broken rings, cracked piston, blown head gasket, etc) could explain the smoke at higher rpm's.

I'd start with a cylinder contribution test, then a compression check, then pull the injectors and have them checked/rebuilt if everything else checks out OK.

Are we talking about a 7.3L Powerstroke here?

If not, then this thread is in the wrong place. If you're asking the question on the Mercedes Diesel, then let me know and I'll move the thread to General Diesel.

You can pick up a compression tester and glow plug adapter for around $50. Search the web for Star Products 15-TU. That's the Diesel Compression tester I have. You'd also need an adapter to fit your engine model.