Question about 1988 Ford F 250
Make sure that ecm belongs with that motor,sounds like this truck has been an electrical nightmare,check his work inside the distributor,check module and picup coil wiring to verify its correct,when you fire up the fuel pump ,you will hear that relay click ,,unless you totally rewired it,otherwise,find someone with a manual,or the chilton books at the library
Posted on Sep 22, 2009
The computer will need to be replaced.
Posted on Sep 22, 2009
Some cars need a signal from crankshaft sensor. If there is no signal, then it wil turn of the power to the primary coil and fuel pump. That is a later part.
Your idea is to check its basic function from Fuel, spark is a way to start.
1- Let's start witt your idea for the Fuel pump independly from a relay. After it works then a schematic will tell you which one. You still have a few more step to that.
2- Let's check the spark produced from the coil independently from the ignition module.
a- Take off battery cable to the engine.
b- Connect power to the primary coil to batery.
c- Make a pulse on primary coil by touch on and off either positive or negative wire to generate high voltage from the secondary coil. From this leading directly to a spark plug so you can see a spark or not.
d-With this information you know where to continue the troubleshooting.
Once you have basic spark anf fuel, then the rest is to find the control not making these happened for the engine to fire up.
Posted on Sep 21, 2009
Sound like you have firing and fuel flow problems. being the year and Im sure it has many miles, Yes, you should always have full 12V charged in the coil when the ignition is on. The coil may be charged with 12V and not dispersing any charge to the plugs when cranking/turning the motor over because nothing is telling the coil to disperse the sparks, more likely will be the cam sensor. I would go ahead replace the CAM and the Crank sensor both. cam sensor responsible for timing telling ecm to disperse and send fire from the coil to the distributor, and than distribute the sparks to the plugs. crank sensor does the same but work the fuel pump. the electric fuel pump will not turn on unless the crank sensor sense the flywheel is turning and have to stay turning to keep the fuel pump on. if you have to replace any relays of fuses, computer, get it from a junk yard. hope that help a some
Posted on Sep 20, 2009
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Posted on Jan 02, 2017
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