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If it smokes at startup only, the valve seals are probably leaking. If it's not smoking too bad, you're ok, but the problem will get worse in time. The cylinder head will need to be removed in order to replace the seals, and while it's removed, you might want to get the valves grinded and the head surfaced.

For a 7.3L DI some smoke is acceptable but when it starts to smell really strong of un-burnt fuel or burning oil typically the valve guide seals are NOT a problem on these models. Each of the 8 injectors have a series of large o'rings which seal the injector into the injector cup. These o'rings seal to the head and seperate oil from fuel and direct it to the correct area of the injector. Over time these o'rings become very brittle and either oil or fuel is seeping past the o'rings and entering the combustion chamber slowly but surely and you have all 8 of them doing this a little then you get the smoke and bad smells from the exhaust. I am very certain this is your problem you will need to remove all the injectors and replace all the old injector o'rings. You can get them at your local Ford dealer. I've done this repair many,many times with success. good luck

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Q: 2000 f250 smokes when you start it and smells like burning oil Anyone else have this problem If so what was it?
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