Runs rough

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
If the plugs haven't been replaced for 5 years, I would start with a new set of plugs, wires, distributor cap, and rotor. Chances are you put a good many miles on it over 5 years and need replaced. I would try that and see if it makes a difference.
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Tuesday, December 15th, 2020 AT 3:41 PM (Merged)
Tiny
SCOTTCLOD
  • MEMBER
  • 1 POST
  • 1996 FORD F-150
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 151,000 MILES
After the engine warms to operating temperature and I shut it off, if I come back after about 30 to 45 minutes it starts but idles really rough until I put it in gear and pull off. What's going on:
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Tuesday, December 15th, 2020 AT 3:41 PM (Merged)
Tiny
BMDOUBLE
  • MECHANIC
  • 1,139 POSTS
I would inspect really closely for vacuum leaks and split vacuum lines, also what condition is the ignition system, spark plugs and plug wires? Spray the spark plug wires when it's dark out and check for spark escaping the wires. Let us know what you find.
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+2
Tuesday, December 15th, 2020 AT 3:41 PM (Merged)
Tiny
MARKO081068
  • MEMBER
  • 2 POSTS
  • 1996 FORD F-150
Engine Performance problem
1996 Ford F150 6 cyl Two Wheel Drive 180 miles

my truck wants it runs for about 15 min will just running bad and you can start smelling gas
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Tuesday, December 15th, 2020 AT 3:41 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Have you checked fuel pump pressure? You may have a bad regulator. Also, has the check engine light come on?

Let me know.

Joe
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Tuesday, December 15th, 2020 AT 3:41 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Have you checked the regulator? Also, let me know if the check engine light came on.

Joe
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Tuesday, December 15th, 2020 AT 3:41 PM (Merged)
Tiny
MARKO081068
  • MEMBER
  • 2 POSTS
No I sure havent noticed a check engine light
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Tuesday, December 15th, 2020 AT 3:41 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
You need to check the fuel pump pressure and the regulator. If you need directions, let me know. Also, let me know what you find.

Joe
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Tuesday, December 15th, 2020 AT 3:41 PM (Merged)
Tiny
GREENFEET
  • MEMBER
  • 1 POST
  • 1995 FORD F-150
  • 100,000 MILES
Around town it's fin e but sporadically struggles, then surges @ higher speedson the highway about 15 minutes in, acceleration stuggles then takes off, then check engine light comes on and its fine for a 5 minutes, then does same pattern again
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Tuesday, December 15th, 2020 AT 3:41 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Get the code number for us to further help you. It could be a fuel delivery issue, cat converter or mass air flow.

Have you changed the plugs and coils lately?

Roy
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Tuesday, December 15th, 2020 AT 3:41 PM (Merged)
Tiny
PKW001
  • MEMBER
  • 1 POST
  • 1995 FORD F-150
  • 150,000 MILES
Truck has a I-6 engine, automatic, fuel injection, 1995 f-150 filled with gas drove 200 miles towards home. Truck progressively ran worse. Upon arrival home parked and truck will not start back truck was running great prior to this trip.
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Tuesday, December 15th, 2020 AT 3:41 PM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 33,916 POSTS
Not very descriptive but from what I can tell, the only thing that changed was the gas. If you filled from a tank that was recently filled from a truck, debris would have been stirred up that could have gotten through their filters and into your tank. There could be water in that gas too that had been settled on the bottom of their tank. That would clear up after you refill again. There is also a screen in the pickup assembly in the tank that can get plugged. That is more likely to be related to the 200 miles vs. The gas. A plugged screen will not clear up after you refill the tank.
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Tuesday, December 15th, 2020 AT 3:41 PM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
  • 1995 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 71,250 MILES
1995 Ford F-150 4X4 mileage: 71,250. My truck starts hard when cold (six to eight turns). Once started, it runs well for about two to three miles until the EGR valve kicks in. Then the engine stumbles/skips for about two miles. However, when the engine does warm up and the temperature gauge is in the normal position, everything is fine. I have replaced the EGR valve, but it has not improved the situation. I have talked to several mechanics that have said that it is engine design flaw concerning the fuel distribution to the fuel injectors. The fuel doesn't get to all cylinders in time when the engine is cold. Have you heard about this? Do you have any suggestions or do you know of any aftermarket fuel system changes that you could recommend to avoid this problem. I am running out of ideas and Ford doesn't seem to have answer to fix the situation. Thanks for your time and help.
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Tuesday, December 15th, 2020 AT 3:42 PM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
We do not think the EGR valve is causing your problem. Replace the temperature sensor as it may be giving false readings to the ECM. Then, scan the ECM for stored fault codes.
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Tuesday, December 15th, 2020 AT 3:42 PM (Merged)
Tiny
EARWIG
  • MEMBER
  • 2 POSTS
  • 1995 FORD F-150
  • 6 CYL
  • 4WD
  • MANUAL
  • 95,000 MILES
I am having a problem with my 95 F150, 4x4, manual tranny, straight 6 pickup. It is having a problem where it lightly "bucks" when driving at a steady speed. When idling or accellerating everything seems fine and runs smooth, but has the rough type of cutting out while at a steady speed and load (40 - 45 in 4th, but also in other gears too).

I changed the fuel filter, performed tune up (plugs, wires, rotor, and cap, air filter) with OEM parts. Thought maybe fuel pump, but it occurs regardless of which tank I use. The thorttle body was also cleaned and I have used injector cleaner in my engine a couple of times. A friend took a ride with me and said he didn't think it was fuel. Could it be something with the tranny? Computer? Could this be tied to the EGR?

Any assistance would be appreciated.
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Tuesday, December 15th, 2020 AT 3:42 PM (Merged)
Tiny
TEXASTURKEY
  • MEMBER
  • 11 POSTS
If the RPM's are around 1500 to 1800 it is the fuel pump. I have a 91 and it does the same thing. My front tank pump finally died so right now I am running on the rear only.
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Tuesday, December 15th, 2020 AT 3:42 PM (Merged)
Tiny
EARWIG
  • MEMBER
  • 2 POSTS
I was originally thinking it might be that, but it happens the same using either tank and istn't the fule pump in the gas tank? If so, it would be too odd that both go out at the same time, isn't it?

A modification to my original post.

I notice that it doesn't happen when it is cold, but when my temperature gauge gets to the line at the bottom of the "normal" range is when it begins.

I wish I had a tach so I could nail it down to certain RPM's, which would be helpful.
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Tuesday, December 15th, 2020 AT 3:42 PM (Merged)
Tiny
TEXASTURKEY
  • MEMBER
  • 11 POSTS
Ford had a recall about the fuel pumps and the transfer switch. Here is one of the many links about the fuel switch. They used a similar system until about 2000 so it should pertain to your truck also.
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Tuesday, December 15th, 2020 AT 3:42 PM (Merged)

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