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Engine runs very rough?

Tiny
KINGSLAYER
  • MEMBER
  • 1992 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 144,000 MILES
New fuel filter, fuel present at rail. New Throttle position sensor. Recently new tune up which included plugs, wires, cap, rotor, oil and oil filter, air filter, new battery with clean connections.

Engines starts ok, drives great for about 2-3 miles. Then starts missing very badly will not accelerate and eventually dies. Cannot be restarted until the next day.

Need some advice as to where to begin? Any help will be greatly appreciated. Thanks very much.
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Friday, September 18th, 2009 AT 2:09 PM

50 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Most likely the TFI Module located left rear engine bay. See diagram below. Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
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Tuesday, January 8th, 2019 AT 6:03 PM
Tiny
KINGSLAYER
  • MEMBER
  • 3 POSTS
Thank you so much I will replace this today! I appreciate your help.
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Tuesday, January 8th, 2019 AT 6:03 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Let me know how it goes. This guide can help as well.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Please run down this guide and report back.
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Tuesday, January 8th, 2019 AT 6:03 PM
Tiny
KINGSLAYER
  • MEMBER
  • 3 POSTS
Replaced the TFI module. It has done the trick. Truck is running great now. It seems to be getting better gas mileage although not sure yet. The smell of gas is considerable less at the exhaust.

Thanks so much Doc!
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Tuesday, January 8th, 2019 AT 6:03 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Your Welcome hope that does it come again when needed.
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Tuesday, January 8th, 2019 AT 6:03 PM
Tiny
WHITEBOY476
  • MEMBER
  • 1 POST
  • 1992 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 95,000 MILES
My truck acts up from time to time. When it acts up I loose power, check engine light comes on, some times wont start and fuel pump keeps running. It has a 5.8L with dual tanks. I have pulled codes in the past, and replaced the O2 sensor, M.A.P sensor, fuel pump regulator, temp sensor, T.P.S sensor. When truck runs right it runs fine. When acts up Has no power. It does not always act up seems to have a mind of its on regardless of temperature or length of time between drive cycles.
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Tuesday, December 15th, 2020 AT 3:48 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Usually the intermittent like this is the ignition module, If a fuel pump keeps running replace the relay in the under hood power distribution center. You need to get an OBD-1 code reader to see what the computer sees wrong when it isn't running right

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

https://www.2carpros.com/articles/ford-lincoln-mercury-obd1-1995-and-earlier-diagnostic-trouble-code-definition-and-retrieval
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Tuesday, December 15th, 2020 AT 3:48 PM (Merged)
Tiny
TISHPPRD
  • MEMBER
  • 7 POSTS
  • 1992 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 71,111 MILES
I got a 1992 f-150 we replaced the stock 302 motor which had a 154 firing order with a H.O 302 motor that has a 137 firing order now the truck runs rough idles real bad runs very rich and top speed is about 60 mph at 2800 rpm ive replace all the sensors on the motor can you please help me
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Tuesday, December 15th, 2020 AT 3:48 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
You may need to use a computer for a HO engine to make it run right. Is the chek engine light on? If so what codes is it throwing?
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Tuesday, December 15th, 2020 AT 3:48 PM (Merged)
Tiny
TISHPPRD
  • MEMBER
  • 7 POSTS
Thanks The code i've got are 41 25 23 33 21 I did put on the truck 302 induction system so all my wires an cable would line back up also the smog pump has been removed and this motor has not got mass air system on it thyank you Tim sheppard Williamsburg Va
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Tuesday, December 15th, 2020 AT 3:48 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
What computer are you using.?
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Tuesday, December 15th, 2020 AT 3:48 PM (Merged)
Tiny
TISHPPRD
  • MEMBER
  • 7 POSTS
Mustang computer
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Tuesday, December 15th, 2020 AT 3:48 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
So this isnt just an engine swap, you took the entire harness and comp out of a mustang and put it in a truck?
Double check all grounds. Th ecodes may not match up to your truck. What year mustang?
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Tuesday, December 15th, 2020 AT 3:48 PM (Merged)
Tiny
TISHPPRD
  • MEMBER
  • 7 POSTS
No I just swapped motors pulled computer put truck induction on mustang motor and used truck wire harness 1988 motor
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Tuesday, December 15th, 2020 AT 3:48 PM (Merged)
Tiny
TISHPPRD
  • MEMBER
  • 7 POSTS
There is'nt any chance you could call 757 253 1429 is it?

Updated 2-5-09

Thanks for the help the codes i've got are 41 25 23 33 21 iv'e also removed the smog pump an put the truck induction system on the mustang 5.0 so all the wires and cables lineds up
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Tuesday, December 15th, 2020 AT 3:48 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Have you tried the trucks original computer?
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Tuesday, December 15th, 2020 AT 3:48 PM (Merged)
Tiny
TISHPPRD
  • MEMBER
  • 7 POSTS
Yes
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Tuesday, December 15th, 2020 AT 3:48 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Did it act exactly the same? I just want to be sure, this comp is from a 92 truck, if so the codes are defined as follows
21- coolant sensor out of range
23-TPS out of range
25-Knock not sensed during dynamic response test
33- EGR not opening
41- No HEGO (o2 sensor) switching.

You should double check all grounds to be sure, most of the engine sensors share grounds, that may be why the TPS, Knock Sensor, EGR and Coolant sensor and o2 are having a problem
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Tuesday, December 15th, 2020 AT 3:48 PM (Merged)
Tiny
TISHPPRD
  • MEMBER
  • 7 POSTS
Yes iv'e checked all gounds an replaced all sensors I was told that the comp has gone in limp mode and maybe the h. O motor comp won't work right because its out of a car not a truck tat maybe I should get a comp from a 5.8 which has the same firing order as the 5.0 HO motor Get it from the same year 1992 too tell you the truth i've about had with this truck ive spend around 450.00 on sensers and other elec parts tring to get it right an nothing seems to be working
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Tuesday, December 15th, 2020 AT 3:48 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
I hear ya, for some reason Fords really dont like when you swap stuff around. Check theTPS and the Coolant sensor to see if they both have good ground and 1 of the wires on each sensor should be a 5 volt reference to the computer. Use a meter to test the continuity to ground on the wires. The ca/ truck thing may be accurate info as well, to verify this you would need the schematics for both computer plugs to compare them
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Tuesday, December 15th, 2020 AT 3:48 PM (Merged)

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