1988 Ford Bronco will not stay running

Tiny
DON JENKINS
  • MEMBER
  • 1988 FORD BRONCO
  • V8
  • 4WD
  • AUTOMATIC
  • 98,000 MILES
While driving to work at 65 mph it just died, it will start but as soon as you let the key go and it is in run posistion it dies, I have changed ignition switch and key cylinder and it still does the same thing is there a pcm on this and could this be the problem
Monday, January 11th, 2010 AT 1:46 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
It has to do with the PCM. When in the start position, more power is sent to the ignition to create a hotter spark. When the key is put back into the run position, the power supply is cut back (resistor) to prolong the life of the ignition system. If you replaced the ignition switch, that would be my next check.
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Tuesday, January 12th, 2010 AT 6:28 AM

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