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Old 03-26-2009, 17:48   #1 (permalink)
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running rough

I have a 2000 F250 7.3 powerstroke, when its cold due to not being cranked for a while it runs rough you can put it in drive and put it to the floor it slowly moves then takes off then its fine. If you crank it up and let it idle for a while then it fine is it glow plugs?
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Old 03-31-2009, 14:25   #2 (permalink)
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Re: running rough

Glow plugs only warm the incoming air charge when the temperature is below freezing, or close to it. Diesel fuel waxes at colder temperatures which slows the flow of fuel. Diesel fuel pumps are relatively a lot slower than comparable gasoline units which aids in startability as a pump that pushes a lot of fuel (in cold weather it would have to pump a lot of gelled/waxed diesel that can wear out the motor).

I'd do some maintenance checks first, such as fuel filter, and replace the water separator. If the water separator is full of water, some will enter the fuel system causing starting problems as the engine isn't hot enough for the water to evaporate. Watered down fuel will cause problems, even if it's not much. Make sure the air intake is also clean. Filter minders don't always work, so be sure to check the filter at least once a month unless you drive it 100miles a day, then check it weekly.

If the weather is cold, I suggest plugging in the block heater to aid in starting. This will make the glow plugs more efficient and they won't have to run as long.
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