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1990 Ford F-250 ignition switch shuts off

Tiny
RUSTYMANECOWBOY
  • MEMBER
  • 1990 FORD F-250
  • V8
  • 4WD
  • MANUAL
  • 100,000 MILES
Truck will start but quits if I go over a bump - if I grab key/ignition switch, fast enough I can keep it from quitting until the next bump. Someone told me to replace tumbler which I did but problem is the same. Help, please.

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Saturday, October 4th, 2008 AT 12:30 PM

1 Reply

Tiny
JASONRAY
  • MECHANIC
  • 213 POSTS
I would not blame the tumblers themselves but the entire lock cylinder. If there's enough slack in it, the right bump could rattle it enough to 'turn the ignition' off. If that doesn't fix it, replace the ignition switch. Try the lock cylinder first since you can hold it and keep the vehicle from shutting down. Hope this helps.
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Wednesday, October 8th, 2008 AT 6:11 PM

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