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Truck cut out twice, no warning


Vanner1993

Well-Known Member
Joined
Nov 26, 2009
Messages
270
City
New Jersey
Vehicle Year
1983, 1977
Transmission
Manual
1990 Bronco 5.0L 5 speed, I was driving in 3rd and it cut out without warning, cranked and cranked and cranked as I rolled in neutral and finally started with gas pedal maybe halfway on floor. Ran normal, continued home and did it again and repeated what i did before. Made it home, fuel pump is ok, I think its ignition cutting. I looked at my coil and one of the coil negatives was crossed with the capacitor on the side of the coil (both have bare wire ) and they were contacting. Will that cut my coil?
 
I would assume, yes.

The Cap is on the hot side of the coil, and is there to help with back EMF kick back as well as after spark dither, if the other coil small wire is touching this, this would effectively kill the coil.
 
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The inertia switch turns off power to the fuel pump, in case of an accident, these can become intermittent.
Although it may not show as instant dieing more of a sputtering as fuel runs out.

http://www.therangerstation.com/tech_library/InertiaSwitch.html

My bet would be the coil short, as you have found.
But if problem reoccurs I would check it out, or at least have a jumper wire handy :)
 
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