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    clcarrell7's Avatar
    clcarrell7 Posts: 1, Reputation: 1
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    #1

    Mar 16, 2010, 10:22 AM
    What causes a 2003 Ford F250 with 6.0 diesel engine to be sluggish and slow @ startup
    When the truck first starts up when cold it won't drive but maybe 5mph but once it drives a couple miles it runs great. What could be the cause?
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #2

    Mar 16, 2010, 11:40 AM

    Diesel engines are cold running monsters. Check the glow plugs:

    https://www.askmehelpdesk.com/cars-t...ml#post1415281

    I would also recommend that you start using full-synthetic HDDO. When cold, diesels perform much better.
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