Question about 1994 Ford F250 Supercab

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My F250 will not start when it is cold out

Hello, I have a 94 F 250 7.3 Powerstroke Diesel - Direct Injection. If the temp is below 45 she does not start. I have tested the glow plug relay and replaced the glow plugs. If I plug the block heater in it will start up right away no mater how cold it is (5 degrees F is the coldest that I have tried). Any suggestions would be greatly appreciated, except that it does that because it is a Ford - I don't think that is the problem. Thank you

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  • adam12ANT Apr 16, 2009

    I have considered this, and thank you for your input. This is possible, but the motor does not use oil, and is running really strong. I think that it has to do with the compression or timing. It puzzles me because it will not even start at relativity warm temps (45 degrees). I have not done any kind of compression test, I think that the next step is to replace the injectors or the injector timing sensor... neither is very appealing. Any thing else to add?

  • adam12ANT Apr 16, 2009

    I also get the white smoke when I am trying to get it started...

  • adam12ANT Apr 17, 2009

    Thank you mikelbolton, I have tried to let the glow plugs heat up and that does not seem help the get the motor started. I am afraid that I need to rebuild the engine...

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Gasoline engines work with a spark plug, where an electrode ignites the fuel mixture. Diesel engines operate on the principle of heat and pressure. Compression ratios are very high in diesel engines and when the air is compressed into a very confined space it heats rapidly, then the fuel is injected and combusts. Most diesel engines have a "wait to start" light when you first turn the ignition to on. If the temp is below normal, I might would allow for a few extra seconds for the glow plugs to heat up. The block heater will help though, b/c it raises the temp on the engine and allows for it to build the heat neccesary for combustion.

Posted on Apr 16, 2009

  • mikelbolton Apr 16, 2009

    White smoke while starting isn't uncommon. When the engine starts to put out heat(exhaust) it warms the exhaust system up, causing condensation. After the vehicle starts and warms up that should go away.

  • mikelbolton Apr 17, 2009

    Wow, I wouldn't go so far as to rebuild the motor. From what you've told me the truck runs fine when it's not cold. Upon doing a little looking, there's a Technical Service Bulletin that actually covers your exact problem.

    http://www.diesel-central.com/Tech/ford/...

    Basically, there's a good possibility that your Cam Position Sensor has the wrong clearance between it and the trigger wheel. So they tell you to add a shim. I would definitely give this a try before rebuilding an engine.

    Here's the link to a site to purchase the part:
    http://www.directfordparts.com/partlocat...

    Then in the part number box, type: F7tz12j072aa

    Also, make sure to check the sensor and make sure the epoxy isn't damaged on the Cam sensor.

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I'm not big in diesel, but a thought could be to test the compression of the engine. If its not quite what it needs to be, the block heater sounds like it might assist in firing. Just an idea, don't kill me for giving an idea ;-).

Posted on Apr 16, 2009

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