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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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  #1  
Old 05-05-2010, 02:38 PM
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'94 F150 electrical problem

This is a 1994 F150 300 6cyl Auto trans.with over 200,000 miles. My daughter drove it aprox. 1.5 miles this AM. The truck died, no sputter first. Tried to restart, motor turned over but no start. Noticed grey smoke coming from the e- brake pedal area when she went to pull the latch for the hood. No smoke in engine compartment or smell of elec. burning. Electrical smell strong in cab, but with inspection no obvious burned or melted wires or components. I tested all fuses in dash and under hood. They are all good and correct size. She normally can hear her fuel pump before starting, but couldn't hear it after it died and she tried to restart the truck. Any ideas would be most appreciated. If it was simply the in tank fuel pump I can change that. The electrical issue is worrisome. Thankyou for your help.
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Old 05-05-2010, 02:42 PM
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ford used a pump on the frame *roughly under the e-brake area* and one in tanks

the one on the frame is probably burned up
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Old 05-05-2010, 03:32 PM
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No fuel pump on the frame in 1994.
Sounds like the Computer burned up.
Not hard to change.
Disconnect the battery then:
Just unplug it (10 mm bolt in center) and take it out between the fender and inter fender.
It is located behind the e- brake pedal in the kick panel but has to come out from under the hood through the fender.

Click the image to open in full size.

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Old 05-05-2010, 04:28 PM
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Subford,
Thankyou for your fast reply. Of course I have a question or two. If it is the computer why would it burn up and is there any way to check it? I have another 1994 F150 here with the same motor ( timing gear broke), but it's a 5spd manual. Will the computers be the same? The other option I have is a 1994 Auto trans with a 351.
Thanks Beth
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Old 05-05-2010, 04:41 PM
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The 300 won't run on a computer for a 302/351, that I'm aware of. The larger issue is that you have an electronic automatic, probably E4OD, that is controlled by the ECC.

You can connect the computer from the other 300ci truck and see if the engine fires, that way you'll know if an issue with the ECC, but you won't be able to drive it without the correct computer in the truck.
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You're having problems because some butthole put the wrong one on your truck.
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Old 05-05-2010, 08:19 PM
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Originally Posted by MaryfPoppins View Post
Subford,
Thankyou for your fast reply. Of course I have a question or two. If it is the computer why would it burn up and is there any way to check it?
Yes take it out and open it up and I am sure it will be obvious.
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Originally Posted by MaryfPoppins View Post
I have another 1994 F150 here with the same motor ( timing gear broke), but it's a 5spd manual. Will the computers be the same?
You give a hint that your truck is and Automatic so you can use it to see if the engine starts but do not try to drive it as it will not shift the transmission as Virto saying.
So NO they are not the same.
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Originally Posted by MaryfPoppins View Post
option I have is a 1994 Auto trans with a 351.
Thanks Beth
That one will not work at all.
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Old 05-05-2010, 09:09 PM
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I will work on this more tomorrow as daylight is fading. Do I have to be concerned about burning up the next computer? Anything I need to check to find out why this one burned up?
Thanks
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Old 05-05-2010, 10:36 PM
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Most of the time this happens when someone washes the engine compartment. They get water in the computer plug and the grease has dried out and it shorts there.

For the most part the computer is a grounding device that either grounds a solenoid or a relay. It also outputs a 5 Volt DC supply to some sensors and monitors the input back from all of its sensors.
This makes it very hard for something outside the computer to do it any harm other than too high a voltage. If the alternator puts out too high DC voltage then it can blow something in the computer.
The caps in the computer can also short with age and cause it to burn some chips.

Most of the time when one burns and it was not pressure washed the owner will look and look and not find anything wrong, then they will replace the computer and have no fruther problems with it.

There are no guarantees as yours could do something different but if you buy one from an auto parts store and it does not work out from the reports I hear they will replace it again.
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95 F150 302 4R70W EB EX-CAB
94 F53 460 E4OD COACHMEN SANTARA RV
83 F150 Flare Side 351W AOD
77 F250 351M-2V NP 435/4 Speed 4X4
subford@gmail.com
Bill K, Kansas Chapter
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  #9  
Old 05-07-2010, 12:27 PM
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subford,
You were correct that once I opened it the problem would be obvious. No pressure washing done so I am gonna assume it was just it's time to go ( I hope ). Now I just have to find a new one that doesn't break the bank. I truly appreciate all the help.
Thankyou Beth
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Old 05-07-2010, 12:45 PM
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You can take the number off of it and call around to a few salvage yard for one or look on ebay for one.
The number you are looking for is the drawing number that Ford puts on it.
It will start with an F3 or F4 more than likely.
Ex. = F4TF-12A650-APC

If you look on line a lot of the sources will leave out the 12A650 and jut post Ex F4TF-APC
as all of the computers have the 12A650 in their number. So search both ways.
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95 F150 302 4R70W EB EX-CAB
94 F53 460 E4OD COACHMEN SANTARA RV
83 F150 Flare Side 351W AOD
77 F250 351M-2V NP 435/4 Speed 4X4
subford@gmail.com
Bill K, Kansas Chapter
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Old 11-10-2012, 11:03 PM
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hey i have an 87 f159 with a 5.0 . i have a problem with it .. i was pulling out of my gf driveway and had my foot to the floor and it poped under the hood and started spiting and sputering . thought i blew the motor.. so changed motor and a motor i know is good.. put it in runs the same as my old motor only stays runing if u have ur foot on peddel. any on have any ideas or advise .. ???
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Old 11-11-2012, 07:35 AM
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Did you use the old upper intake and sensors?
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94 F53 460 E4OD COACHMEN SANTARA RV
83 F150 Flare Side 351W AOD
77 F250 351M-2V NP 435/4 Speed 4X4
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Bill K, Kansas Chapter
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Old 11-11-2012, 11:27 AM
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87 f150 problems.. need help

hey i have a 87 f150 and i have a problem ! i was pulling out of my gf drive way and had my foot to the floor and it poped under the hood and starded to spit and sputer and only runs if u have ur foot on the gas . so i changed the motor and one i know is good and .. it rund the same way as my other motor ! any one got any ideas ?! please
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Old 11-11-2012, 12:08 PM
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yes cuz the motor put in it was out of cop car and the intakes wher different so i put my old intake and plenum on the new motor .
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Old 11-11-2012, 04:00 PM
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any idaes ?
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Old 11-11-2012, 04:00 PM
 
 
 
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