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f650

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  1. W

    5.9 dying when warms up

    I have a @006 f650 with the 5.9 cummins in it with Allison automatic. When I start the truck when cold it will start with no problem. As the truck warms up it starts to loose power. After driving 2 to 3 miles it will slow down to max speed of around 15 mph. If you lift your foot off the throttle...
  2. B

    Archived HELP!!! 2007 Ford F650 w/ Cummins ISB 5.9 (non DEF) black smoke under acceleration

    We have a 2007 Ford F650 rollback with an ISB 5.9 mated to an Allison 2200 RDS. Under acceleration low and heavy, the truck produces large amounts of black smoke. I get an intermittent service engine light but no codes show in the ECM. I just need someone with some good diesel logic that isn't...
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