Question about 1997 Ford F250 SuperCab

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1997 F250 Powerstroke 256,000 miles. Last time cranked, started with white smoke and smoke throughout running. Never cranked since. With the amount of miles I thought it best to replace the HPOP and fuel pump. Bought the vehicle in Missouri, Owner had just replaced the oil pump and had the heads reworked and the upper end rebuilt. I have no codes showing on the OBD-II system and it attempts to crank on starting fluid but never really starts. I can smell the exhast and it appears to have the smell of some sort of fuel attempting to burn. I have checked the battery cables and repaired them and even put in two new batteries and to date have had no success. I have also placed new fuel lines from the fuel filter to the heads.

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  • mcso619 Sep 12, 2009

    Vehicle is a diesel not gas oriented. From my dealings with diesels white smoke can mean either lack of fuel or water. Truck ran perfectly for the 9 months after I purchased it and only ran this way for one day. I've never know exhast valves to do something like this, if they weren't sealing wouldn't the starting fluid not attempt to spark and attempt to stall they process. Do you have any other ideas.

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It is most likely it is cylinder head or the cylinder head gasket. The white smoke is comming from water in the combustion chambers. The only way water can get there is with the fuel, intake manifold or through the cylinder head. As you have changed the fuel line's and pump then the fuel is O.K. Unless you drove it through deep water then the water can't get in the intake. The smell you are getting is probably fuel and coolant mixed together. Because the engine had work done to it before you bought it sound's like it previous owner although he did work to it maybe missed the real fault. If you can contact the previous owner find out why he had to rebuild the engine and what part's were fitted especially the head's and gasket's and ask for receipt's for the part's to make sure.

Posted on Sep 12, 2009

  • Charles McElchar
    Charles McElchar Sep 12, 2009

    It is mostly diesel I have experience with. When smoke is a problem then usually with smoke white = water, blue = burning oil, black = overfueling, When the engine (except in startup) goes with no smoke = perfect running order , engine not starting and no smoke then although they may not be the problem then fuel lines are the next check. I'm sorry about the missunderstanding about when you bought the car. when I first read your problem I thought you bought it recently. If I had to fix it myself then my first check when I see white smoke would be to remove one injector at a time then turn the engine over a few times to see what come's out (should be water or coolant) and from which cylinder the problem is comming. As you probably know that smoke regardless of the colour start's in the cylinder's. multiple head engines are a lot easier and less expensive to fix. Hope this help's you better to understand why I think it's water (coolant) trouble. Cheer's

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The last time cranked, smokes were through running, meaning :
1- Running rich meaning not correct air: gas ration of 14.6:1
2- Exhaust valves were not seating correctly or stem valve were bad.
3- Weak sparks.

I would check compressor pressure first to see every combustion chamber is OK before going further.
If it is good then address spark issue with ignition coils and spark plugs then going back to # 1.

Posted on Sep 12, 2009

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