2003 F-250 7.3L has no power if you step on the throttle/ falls on its face - Ford Powerstroke Diesel Forum
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Old 09-28-2013, 02:13 PM
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2003 F-250 7.3L has no power if you step on the throttle/ falls on its face

Hey everyone I'm newer member of the site but been following for years until I bought my diesel recently and became a member! Anyways I bought a 2003 f250 with the 7.3L and I drove it home and it has no power wen tou push the throttle past 1/4 to 1/2 way gets up to speed slowly but steadily and shifts fine but when I go I downshift on the highway and step on the throttle it looses speed and has NO power!! Idles great, no smoke free revs in park nice and smooth and fast.... Just wondered if anyone had the same problem before or if someone could steer me in the right direction! Any help is greatly appreciated thanks a lot in advance!
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Old 09-28-2013, 03:33 PM
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Try the easy stuff first

If you don't know the maintenance history, I'd throw a Fuel Filter in it now, Also, have a look at the oil, believe it or not, Tired Oil makes the engine run badly (the engine oil is used to hydraulically drive the injectors and if it Foams at the high pressures, it runs like crap)...
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Old 09-28-2013, 03:57 PM
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It does have new oil in it with the rev-x addative also, but the truck has no power when you step on the gas but if you just push it to about 1/4 throttle and leave it there it will slowly climb up to speed amd even do 80mph no problem but as soon as I step on the gas it downshifts and the rpm`s stay at about 3000 and looses speed until I ease up on the gas and it shifts back up and slowly gains speed
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Old 09-28-2013, 06:56 PM
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Fuel filter

Sent from AutoGuide.com Free App
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Old 09-29-2013, 04:46 AM
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Man I hope so! Going to try that as soon as y local parts store opens up! Shouldn't there be a light that comes on for a fuel filter?
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Old 09-29-2013, 04:50 AM
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Also, is there only one fuel filter on the 7.3? Because my 2006 6.0 had 2 of them
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Old 09-29-2013, 05:37 AM
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One fuel filter, no "light" if it's restricted just for Water, don't waste your money on RevX in a 7.3...
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Old 09-29-2013, 05:45 AM
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sounds like its starving for fuel, use a good name filter, no cheap crap
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Old 10-01-2013, 03:40 PM
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Well turns out there was a vacuum hose coming off the base of the turbo pedestal that wad un hooked and as soon as I plugged it in it ran great! I also put a new fuel filter on it just for the hell of it never hurts! Thanks for the responses everyone im glad it was something stupid!
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