Ignition problems

Tiny
FAYLIN
  • MEMBER
  • 1995 FORD F-250
  • 7.5L
  • 2WD
  • AUTOMATIC
  • 147,000 MILES
The engine will start and run all day but sometimes when I stop it then give it a little time it will not start until several hours or in the morning. There is no spark coming from the coil wire. I have replaced the ignition module, coil and wire, cap and rotor. Last time I started it I just backed out and it shut off. I waited about an hour trying several times to start then finally it started. I hope it is not the computer.
Wednesday, November 29th, 2017 AT 7:51 PM

2 Replies

Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
  • 1,853 POSTS
Well, let's hope this is just a simple problem. Let's first check to make sure that the distributor and ignition coil are both getting twelve volts from the fuse when the key is on run/start when this no spark problem is occurring. They are both fed from the same fuse U in the engine compartment fuse block.
It is the red/light green wire for both the dist and coil.
Below is that wiring diagram.
I see that same wire also goes to the ignition module as well, so there are three spots fed from that same U fuse.
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Thursday, November 30th, 2017 AT 6:00 AM
Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
  • 1,853 POSTS
If the voltages are fine, since all fuel injected engines use the TFI-IV system, test the stator.
Measure the resistance of the stator assembly, using an ohmmeter.
It should be 800†975 ohms.
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Thursday, November 30th, 2017 AT 6:10 AM

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