1990 Ford F250 ignition switch shuts off

1990 FORD F-250
100,000 MILES • V8 • 4WD • MANUAL
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RUSTYMANECOWBOY
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  • 1 POST
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.

I will donate if I get a satisfactory answer.
Oct 4, 2008 at 12:30 PM
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JASONRAY
  • CAR REPAIR CONTRIBUTOR
  • 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...
Oct 8, 2008 at 6:11 PM
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