What gets tired on these engines - Diesel Forum - TheDieselStop.com
'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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post #1 of 5 (permalink) Old 11-27-2017, 10:27 PM Thread Starter
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What gets tired on these engines

My 01 7.3 Excursion seems to run just fine, but it doesn't have the umph it once had. Maybe it's just my imagination. But seems like it used to pull a lot stronger than it does now.

It is all stock, not much done to it, replaced a couple sensors over the years, regular oil changes, etc. Engine has 212k on it, getting about 16 mpg on the highway, which seems low to me.

Is there anything I should test, or inspect.
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post #2 of 5 (permalink) Old 11-27-2017, 11:09 PM
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16 MPG is pretty good.

Things that might reduce the power are exhaust up-pipe leaks which causes less boost. Also leaking intercooler boots.

A good engine cleanup and inspection would reveal any of those things.

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post #3 of 5 (permalink) Old 11-28-2017, 11:04 AM
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The injectors get tired over time and with 212 on the clock. But 16 mpg is still showing decent on the injectors. One thing that woke mine up was a new turbo I did the GTP38R the drop in replacement. As klhansen noted up pipes to the turbo if stock leak and you lose a little power. Intercooler boots get soft and can leak boost pressure causing lower power and poor fuel economy 4inch turbo back exhaust helps and the 6637 air filter will help a lot.


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post #4 of 5 (permalink) Old 11-29-2017, 03:52 PM
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Quote:
Originally Posted by bossbotana View Post
My 01 7.3 Excursion seems to run just fine, but it doesn't have the umph it once had. Maybe it's just my imagination. But seems like it used to pull a lot stronger than it does now.

It is all stock, not much done to it, replaced a couple sensors over the years, regular oil changes, etc. Engine has 212k on it, getting about 16 mpg on the highway, which seems low to me.

Is there anything I should test, or inspect.
check your fuel pressure

most of the time the driver behind the wheel gets "tired" and gets rid of the vehicle before the engine gets tired.

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post #5 of 5 (permalink) Old 12-01-2017, 04:44 AM
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Everything related to the fuel system. Pump, pressure regulator, screens in the tank sending unit get clogged. Injectors themselves usually have significant signs of wear by that mileage. If the engine is noisy, lacks power, idles rough, and smokes when it's cold and warming up but smooths back out and runs well as the oil gets hot, that's the injectors. They are expensive to replace but they make a wide variety of choices depending on how much extra power you want or whether you want extra trouble or hassle getting it tuned right.
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Last edited by Brandonpdx; 12-01-2017 at 04:49 AM.
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