buddy bought a 95 7.3 and feels gutless - Ford Powerstroke Diesel Forum
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Old 04-19-2013, 08:40 PM
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buddy bought a 95 7.3 and feels gutless

Hi guys... So basically my buddy had bought a 95 7.3 PSD it has a manual 5 speed tranny... We put a 4" exhaust, 3 inch down to 4 exhaust on it,

Now to the point.. the truck is somewhat gutless, imo it runs extremely lean, I mean it has never in its life puffed a bit of black or hazed... the closest thing it comes to smoking is when she fires up in the morning and puffs a tad out.. which seems to be normal imo. But when you drive it it has hardly any power up until 2500 rpm or so and even then its not all that impressive, but once you hit 3rd or so gear it seems like its really working er to speed up.

Is this normal? or should these 7.3's puff some smoke when it gets lugged or haze a tad here and there, OR when you floor it until the turbo catches up? also My buddys temp gauge does not work so I'm not too sure if its a bad wire or if the sensors dead and "COULD" be effecting power? but i see no check engine light on.

I had hooked up a snap-on obd2 code reader thingy from our shop.. its one of them advanced gadgets, i could shut off each individual cylinder if i want or injectors, etc (fun thing to play with) and that will display all your sensors info and such like map sensor oil temp, etc, and it did not even list the coolant temp sensor? in the list of like 20+ sensors. Also no codes either

So any ideas at all? or recommendations? I dont know alot about these trucks but I would of thought it should feel a bit better or atleast have more torque than it does. Thanks!

Last edited by Octane; 04-19-2013 at 08:44 PM.
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Old 04-19-2013, 11:38 PM
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Check for boost and drive pressure(up-pipes) leaks. That is the most common problem for a lack of power. Once you confirm that everything checks out in that section, you can do more diagnostics involving ICP, and the rest of the sensors on the engine.
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Old 04-20-2013, 05:20 AM
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i would also clean the fpr screen
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Old 04-20-2013, 06:10 AM
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when you did the exhausts, did you do anything w/ the turbo down pipe? also, disconnect the exhaust back pressure valve...........
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Old 04-20-2013, 06:33 AM
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First off how many miles? when was the last oil change (this affects more than you would ever believe)? hows the air filter look? Did you change the fuel filter?? As mentioned before the Fuel Pressure Regulator Screen needs cleaned. Do you have a way to check fuel pressure? these trucks lose fuel pressure over time being all mechanical systems

These trucks wont smoke much even tuned so I wouldnt be using that as a reference point.
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Old 04-20-2013, 08:15 AM
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Quote:
Originally Posted by sldghamr View Post
when you did the exhausts, did you do anything w/ the turbo down pipe? also, disconnect the exhaust back pressure valve...........
downpipe was changed to a 3" 2 piece mandrel bent pipe, And when you say disconnect the backpressure valve... what do you mean? like just unplug it?

Quote:
Originally Posted by kanuck15 View Post
First off how many miles? when was the last oil change (this affects more than you would ever believe)? hows the air filter look? Did you change the fuel filter?? As mentioned before the Fuel Pressure Regulator Screen needs cleaned. Do you have a way to check fuel pressure? these trucks lose fuel pressure over time being all mechanical systems

These trucks wont smoke much even tuned so I wouldnt be using that as a reference point.
it has about 320K km's, i checked the blowby on the motor and it is very little at all, the way things are or were setup i'd almost believe motor was replaced at some point... especially for such little blowby for the kms... we just changed the oil ~200 kms ago, new fuel filter, oil filter, and transmission oil too. but the fpr screen, i am not too sure on that one, is it a small screen on the side of where the fuel filter sits, theres a hole and a small screen where that other thing on the side connects? (sorry for lack of words not too sure what to call them)

Quote:
Originally Posted by Justin@DP-Tuner View Post
Check for boost and drive pressure(up-pipes) leaks. That is the most common problem for a lack of power. Once you confirm that everything checks out in that section, you can do more diagnostics involving ICP, and the rest of the sensors on the engine.
whats best way to check for boost? i guess a boost gauge, but aside that? because boost only seems to actually hit or hit hard at about 3000 rpm which seems really high to me (or by the sound of the turbo anyways)

Quote:
Originally Posted by erics diesel View Post
i would also clean the fpr screen
we had the fuel filter manager and all that area off, because the mechanical pump was spitting out diesel, so not sure what screen you are referring to if its the little one that goes into where the fuel filter goes, then that is clean
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Old 04-20-2013, 08:25 AM
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Ok so its fresh on fluids, right about 200k miles on it. Could be injectors starting to get weak. But start everywhere else first.

the fuel pressure regulator screen is on the side of the fuel bowl. remove the two 10mm bolts and pull it off. You will see the screen. Also on the regulator there is a plastic part that unscrews there is a screen in there also

Just a question, what gears does it have?
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Old 04-20-2013, 08:51 AM
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Quote:
Originally Posted by kanuck15 View Post
Ok so its fresh on fluids, right about 200k miles on it. Could be injectors starting to get weak. But start everywhere else first.

the fuel pressure regulator screen is on the side of the fuel bowl. remove the two 10mm bolts and pull it off. You will see the screen. Also on the regulator there is a plastic part that unscrews there is a screen in there also

Just a question, what gears does it have?
the screen there on the side is good 2 go, ill see about checking the other plastic part you were talking about. And gears im not too sure

heres a picture i took off the side of the tranny on that plate that gives the infos and such if thats what you need to know, or would it be the rear diff gear ratio? https://lh6.googleusercontent.com/-R...327_154623.jpg
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Old 04-20-2013, 12:40 PM
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Thats a typical ZF, I am asking about whats in the rear end. If its a 3.55 rear end its gonna be a little doggy in stock form
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Old 04-20-2013, 04:00 PM
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Quote:
Originally Posted by Octane View Post
whats best way to check for boost? i guess a boost gauge, but aside that? because boost only seems to actually hit or hit hard at about 3000 rpm which seems really high to me (or by the sound of the turbo anyways)
Make a boost leak tester. You can Google that term and you will find out how.

Unless someone added an intercooler to the truck there will only be a couple places that can leak.
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