Test drove a 99 6 sp today, need input - Ford Powerstroke Diesel Forum
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Old 04-03-2012, 08:12 PM
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Test drove a 99 6 sp today, need input

So I had the truck out on the interstate in top gear at about 65-70 with some rolling hills and I could not get it to gain any speed while ascending the grade. I passed on the truck but want to know what may be the cause of this or is it just normal for this year and HP level? I am thinking a boost or injector problem. No gauges in the truck, all stock with 181k on it, 4wd and 315's.
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Old 04-04-2012, 05:31 AM
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With the big tires and the fact that its stock may be the problem. It probally still has 3.73 gears. It may just need a little more power or lower gears to regain the lost power from the larger tires.
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Old 04-04-2012, 05:36 AM
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Could be the tires and diff gears, or what gear you were in and the RPMs you were running.
Could be boost/exhaust leaks somewhere.
Or a clogged fuel filter/delivery system.
That's just the obvious stuff.
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Old 04-04-2012, 05:57 AM
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There's definitely something wrong with the truck... Mine has plenty of power in overdrive with 315s and 3.73 gears.
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