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Old 11-06-2012, 13:24   #1 (permalink)
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05 f250 5.4L loss of power 3000-4000 rpm

Losing major pickup at 3000-4000 rpm but only seems to be at wot. Tested at half throttle and didn't seem to be a loss. At wot feels like a misfire but figured it would be the same at half throttle. Any input?
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Old 11-06-2012, 13:49   #2 (permalink)
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Re: 05 f250 5.4L loss of power 3000-4000 rpm

Have you replaced the fuel filter? Also, the WOT has a fuel cutoff to prevent over revving.
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Old 11-06-2012, 16:10   #3 (permalink)
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Re: 05 f250 5.4L loss of power 3000-4000 rpm

Fuel, filter has been changed. This is happening while driving, so there should be no issue with over revving
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Old 11-06-2012, 17:14   #4 (permalink)
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Re: 05 f250 5.4L loss of power 3000-4000 rpm

Scan for codes to see if you going lean or rich.
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