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Shuts off when you release key form start position

Tiny
BUDSTERW
  • MEMBER
  • 1991 FORD BRONCO
  • 5.1L
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
Vehicle starts when key is engaged in start position but shuts off when key springs back. No power to coil when key is in run position. Will run if jumped from coil to positive battery. Help!
Monday, January 15th, 2018 AT 11:39 AM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
I looked at a diagram for a 5.0L engine, and from what I can tell, a good suspect is a failed EEC relay. It is bypassed by the ignition switch during cranking.
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Monday, January 15th, 2018 AT 12:34 PM

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