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Ignition/starter switch

Tiny
OGUIDENG
  • MEMBER
  • 2004 FORD F-150
  • V6
  • 2WD
  • AUTOMATIC
  • 102,000 MILES
Park the truck, turn ignition switch to off position and pulled out the key. Engine keeps running with the key pulled out. Reinsert ignition key in, would turn from off to run position, turn smoothly and do not feel any restraint and the engine still running. Unhook battery cable but engine still running, need to pull out 30Amp fuse to shut-off engine.
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Monday, September 17th, 2018 AT 8:07 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Hello,

It sounds like the PCM relay is stuck on. Here is a guide and the engine wiring diagrams so you can see how the system works and the relay location under the hood as well (203):

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

Cheers, Ken
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Tuesday, September 18th, 2018 AT 12:18 PM

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