Old school F350 problem
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3rd Gear
Joined: Apr 2025
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Old school F350 problem
This may be rather lengthy but here is what I got. 93 F350 7.5 gas. The truck was parked for a while. Replaced the fuel tank, fuel pump and fuel filter. Removed all injectors, soaked in Chemtool, hooked up to fuel pump with a pigtail and tested all of them. Re-installed with ne O-rings. Removed plenum re-sealed, re-installed. New plugs, cap, rotor button, wires. Old plugs looked horrible. Rewired TPS (something chewed the wires up) with new pigtail. Chased and repaired vaccuum lines. Even used smoke machine. No visible leaks, Good fuel pressure. Now the problem.........the truck will not accelerate, it spits, sputters and dies. Will not pull a hill. If you can get it going it runs fine just stutters when you accelerate. ANY IDEAS?
Lead Driver
Joined: Feb 2002
Posts: 7,957
Likes: 592
From: Greater Austin, Texas
Test fuel pressure. I recently went thru 2 pumps on a truck I was repairing from sitting before I got one that worked properly. The first pump showed pressure at the tank, but it couldn't even push the gas up to the engine. The second pump did what you are describing, it showed good pressure at the rail and it idled fine, but it would not let the truck accelerate. Tested pressure good at idle, but when I goosed the throttle, the pressure dropped.
Thread Starter
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3rd Gear
Joined: Apr 2025
Posts: 3
Likes: 0
Test fuel pressure. I recently went thru 2 pumps on a truck I was repairing from sitting before I got one that worked properly. The first pump showed pressure at the tank, but it couldn't even push the gas up to the engine. The second pump did what you are describing, it showed good pressure at the rail and it idled fine, but it would not let the truck accelerate. Tested pressure good at idle, but when I goosed the throttle, the pressure dropped.
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3rd Gear
Joined: Apr 2025
Posts: 3
Likes: 0
No codes. Its not OBD II so I will have to get my adapter but the check engine light is not on. Not familiar with an intake pressure sensor. Is that the MAP sensor? TPS had to replace the pigtail because something chewed the wires up. There was enough left to tell which wire went where but the color code on the new wiring is different. Fuel pressure is 30-40 psi
Hotshot
Joined: Jul 2020
Posts: 10,354
Likes: 2,592
From: Near Salt Lake City
After you beat your head for a while and replace half the truck
Check the capacitors inside your processor
Might want to do that right now
Check the capacitors inside your processor
Might want to do that right now
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FTE Chapter Leader
Joined: May 2006
Posts: 12,324
Likes: 1,301
From: Central Mississippi
You can go 80 but no acceleration.
SPOUT plug gone, wire cut, or computer can't advance timing.
SPOUT plug gone, wire cut, or computer can't advance timing.
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