2001 F250 7.3 will not run faster than 25
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4wd Low
Joined: Feb 2023
Posts: 14
Likes: 0
I'm new to the forum and hope to figure out what's going on with my 2001 F250.
I need some help of anyone has had this happen to the 7.3. I was driving in traffic yesterday about 25 when my truck suddenly felt like someone ran into my truck. It jerked a few times and would not go faster than 25. Engine was running just fine. I shifted down to 2nd and drove home about 25 mph. Transmission works nirmal in all gears.
When I got home, I checked for leaks or any obvious signs but all looked normal. No buring smells. Cranks and runs fine.
I need some help of anyone has had this happen to the 7.3. I was driving in traffic yesterday about 25 when my truck suddenly felt like someone ran into my truck. It jerked a few times and would not go faster than 25. Engine was running just fine. I shifted down to 2nd and drove home about 25 mph. Transmission works nirmal in all gears.
When I got home, I checked for leaks or any obvious signs but all looked normal. No buring smells. Cranks and runs fine.
FTE Chapter Leader
Joined: Jan 2005
Posts: 13,111
Likes: 4,716
From: Henderson, NV
Need more information to even make an educated guess. Read the FORScan section from the Tech Folder at the top of this forum then scan for codes. I have reproduced the links below for your convenience.
FORScan
FORScan
- FORScan Instructions - PC
- FORScan Lite Instructions - Android
- FORScan Lite Instructions - iOS
- FORScan Data Log Conversion
- PERDELs via Forscan
- Cruise Control/Speed Control Forscan function test
- Speedometer Calibration Using Forscan - Thread
- Speedometer Calibration Using Forscan - Video
- FORScan + FORScan Lite: Class Tutorial Q&A
Lead Driver
Joined: Aug 2022
Posts: 5,065
Likes: 1,415
From: Oologah, OK
fuel filter clogged up?
my cousin just had the experience yesterday,
her diesel truck would not do more than 2 psi of boost, and 35 mph was the best it would do on the level, forget about climbing a hill.
she bought it 3 months ago at a dealer who professed "our mechanic has gone all thru the truck and it is ready for anything"
uh huh, that was in Montana, she made it half way to New York and it started giving problems..... finally found a diesel mechanic who showed her that the fuel filter was clogged completely up, and the K&N air filter was such a matted up mess, he threw it in the trash....
installed OEM filters and truck now runs 85+ and keeps going, but the highway ran out of open space ....
my cousin just had the experience yesterday,
her diesel truck would not do more than 2 psi of boost, and 35 mph was the best it would do on the level, forget about climbing a hill.
she bought it 3 months ago at a dealer who professed "our mechanic has gone all thru the truck and it is ready for anything"
uh huh, that was in Montana, she made it half way to New York and it started giving problems..... finally found a diesel mechanic who showed her that the fuel filter was clogged completely up, and the K&N air filter was such a matted up mess, he threw it in the trash....
installed OEM filters and truck now runs 85+ and keeps going, but the highway ran out of open space ....
Tuned
Joined: Jun 2007
Posts: 431
Likes: 66
Himes4, FTN is correct.
Fuel tank above 1/4?
What about pulling codes?
Any blinking dash lights?
Need info before you start throwing parts at your problem unless you win the lotto.
The guys here can certainly help you out if you do your homework.
Take care.
Fuel tank above 1/4?
What about pulling codes?
Any blinking dash lights?
Need info before you start throwing parts at your problem unless you win the lotto.
The guys here can certainly help you out if you do your homework.
Take care.
Lead Driver
Joined: Aug 2022
Posts: 5,065
Likes: 1,415
From: Oologah, OK
no power, and tons of black smoke.
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Thread Starter
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4wd Low
Joined: Feb 2023
Posts: 14
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Thanks. I'll change the fuel filter today. I have both a Motorcraft and Wix brand filters. Currently usog a Wix. Do you think after market is ok or should I stay with Motorcraft?
I also read that if the Injector Control Pressure sensor has oil in electrical connector that it should be replaced. Truck has 148k miles on it.
Thoughts?
I also read that if the Injector Control Pressure sensor has oil in electrical connector that it should be replaced. Truck has 148k miles on it.
Thoughts?
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Hotshot
Joined: Jul 2008
Posts: 12,782
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From: N.GA Mountains
Fuel starvation usually makes engine LOUD and can sound like a steel drum full of hammers banging around.
It’s unlikely the fuel filter suddenly became the cause of this problem, but no harm in changing it.
You can rule out fuel supply issues easily by adding some 5/16” hose (cheap vinyl tubing is perfect) to the filter water drain discharge tubing beside water pump on passenger side of block. Make hose long enough to reach a jug or bucket on the ground. Open valve and drain filter (inspect for water/debris), then turn key on and observe flow. You should see a steady stream like a water fountain and get about a quart of fuel before pump times out. Be sure to cycle key on fir about 30sec 3x after closing valve to purge air from filter before cranking.
Another sensor that can fail and cause low power is the MAP sensor. You can also drive with it disconnected and see if it makes a difference.
Next level of interrogation will require a scan tool like FTN recommended above.
FTE Chapter Leader
Joined: Jan 2005
Posts: 13,111
Likes: 4,716
From: Henderson, NV
The general consensus here is that the ICP Sensor pigtail can never be clean enough after an oil leak without replacement. It is not so much poor contact with the sensor as much as possible shorting causing premature sensor failure. Replacing the pigtail is a lot cheaper than constantly replacing sensors.
FTE Chapter Leader
Joined: Jan 2005
Posts: 13,111
Likes: 4,716
From: Henderson, NV
Always go Motorcraft when it comes to sensors and anything associated with them. Or at least quality items like the ones RiffRaff sells. Use good weather-sealed splices too. Don't just crimp on exposed barrel splices that are open to the elements.