7.3 runs like dog do do - Ford Powerstroke Diesel Forum
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Old 05-23-2007, 05:50 PM
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7.3 runs like dog do do

hi all great site by the way i have a 97 250 4x4 7.3 it has no power very crapy fuel milage less then 10 mpg i have changed cps fuel filter no codes come up with scaner it lacks good low speed power in town at 15-30 when i floor it , it is just flat and it will not run higher rpm's i can hould it to the floor, it will only get to 80mph top end i realy could use some help please tom.
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Old 05-23-2007, 06:37 PM
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bad fuel pump??
clogged fuel lines??
slippage in your tranny??
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Old 05-23-2007, 06:40 PM
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I'm not a tech, so I can't really help with your problem.. but I can bump this back toward the top, so a tech is more likely to see it by saying:

Welcome to Powerstroke.org
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Old 05-23-2007, 06:55 PM
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Injection Pressure Regulator maybe??
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Old 05-23-2007, 06:58 PM
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I had a problem with sluggishness in my 7.3 and I redid the intake and exhaust.
I found that when the truck runs on the stock parts, including the catalytic converter, it tends to run worse.
I put a flo pro four inch exhaust on and installed a K and N intake with an Amsoil filter.
This allowed my truck to breathe well.
I had to replace the fuel pump and was told that the injectors would need to be replaced. I found out later that the injectors do not need to be replaced on the 96 and up.
Also, if there is not enough oil in the truck, the engine will run bad.
The injectors use 3000 psi of pressure to run properly. Otherwise, they do not do what they are designed to do.
Just an idea that solved my problem with power and sluggishness.
have a great day,
chefbutthead
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Old 05-23-2007, 08:44 PM
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I am with ABOBB on this one, so to the site and I am sure you will get some more help here soon.
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Old 05-23-2007, 10:24 PM
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could there be something wrong with the turbo? Uppipes leaking?
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Old 05-23-2007, 11:11 PM
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well there is no intercooler on that year of truck but the turbo could be fried or have mutalated fins... take the inlet hose off the turbo and inspect the turbo the fins should not be bent or beat up and the turbin should spin freely by hand and not feel loose and sloppy if you try to jigle it around....
take your fuel filter out and drain the fuel bowl... on the right side of the fuel bowl you will see a brass box bolted to the side that is your fuel presure regulator their is a hole going from the fuel filter housing to the fuel preasure regulator in that hole their is a screen it is more than likely compleatly clogged with black cr@p (suposedly injector O ring particles) clean the screen with Q-tips and a can of sea foam spray... also their is a large brass bolt in the side of your fuel preasure regulator... make sure its tight but dont strip it out brass is very fragile.

annother issue with the powerstrokes is cracked fuel lines visualy inspect the lines all the way from the tank up to the fuel filter housing and make sure there are no visible leaks

good luck and let me know what you find out
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Old 05-24-2007, 05:53 AM
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Maybe we can get ya fixed up. Any luck with any of this so far?
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Old 05-24-2007, 07:11 AM
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I bought my truck with 180k on it and it was totally stock. 3.55 gears and an auto and I was impressed. It was like night and day between a previous 7.3 idi non turbo truck i owned. Stock for stock it was a lot more powerful than a 12v cummins or 6.5TD. So your no performance and bad mileage isn't because the truck is stock.

Have you ran any injector cleaner threw it? If the turbo is workin correctly you should hear it whistle at 2000 plus rpm even with the stock air box. How does it start and run when its cold?

BTW welcome aboard

Last edited by 95PDXLT; 05-24-2007 at 08:30 AM.
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