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Old 09-01-2010, 03:26 AM
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Need help 2000 7.3

Hey guy's
Here's what I got 2000 7.3 Runs real rough at start up has no power really until it warms up but still is not as it should be. Blowing a Blue smoke heavy it clears when you get going but it start to cut out and surge. If I get in the throttle it seems to clear but when I let off same thing?
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Old 09-01-2010, 03:36 AM
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Could have a blown headgasket, blown piston rings, hole or melted piston, blow turbo dumping oil out.

Take off your oil cap and see if smoke come out of there, if it is and excessive amount something might seriously be wrong.
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Old 09-01-2010, 06:47 AM
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Think about what is happening when. Hard start - no power at low speeds with smoke, clears with increased speed.

If you have a blown lower injector o-ring - it would leak oil into the fuel rails. Since you use less fuel at idle, the amount of oil to fuel would be higher. That would make for a rougher idle and more smoke. As you use more fuel, the ratio would go down and you would have less smoke/more power. Also, a warmed up diesel can burn oil pretty effectively so this problem would be more pronounced when the engine is cold.

You can take a look at your fuel filter - if oil is backing up through the fuel rails, you can see traces of it on the filter.

Its a relatively cheap job if you do it yourself. You can get the parts here:

Replacement O-rings for Ford Diesel Engines
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Old 09-23-2010, 08:25 AM
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ok changed orings it does seem to be a little better but not much is it possible my fuel pump is not getting the correct pressure to the motor
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Old 09-23-2010, 09:48 AM
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That's a common problem - but I can't see how it would give you blue smoke or get better when warm. You can tap a fuel pressure gauge into the fuel bowl (there are two plugs in the back not doing anything) and see where you are at. How long have you run the truck after changing the o-rings? Sometimes it takes 20 or so aggressive miles to get the air out of the fuel rails and oil rails.
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