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1991 F150 Key Problems

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Old 12-08-2011, 07:50 PM
Larzon Larzon is offline
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1991 F150 Key Problems

I recently got a 1991 Ford F150 4x2. I got it for $200 expecting some problems. Just not one this big.
Problem:
The truck starts just fine, idles fine, everything works flawlessly. When I go to shift into drive the engine kills but leaves every accesory on.

Anyone have any clue what is causing it to kill? Any help would be appreciated.

Thanks,
Alex
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Old 12-08-2011, 08:50 PM
Plain Jane Plain Jane is offline
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state engine type, and transmission type. does it also die if you shift into neutral or reverse?
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Old 12-08-2011, 09:42 PM
Larzon Larzon is offline
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The truck has the Inline 6 with a Auto transmission. Yes it kills when trying to shift into anything. The key is super sensitive. If you just tapped the key the engine will shut off. It will also shut of if you grab the steering wheel when getting out or in the truck.
We brought it to the one of the local shops for the brake lines and they said that the ignition cylinder lock or switch is worn.
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Old 12-08-2011, 09:58 PM
REAPER4206969 REAPER4206969 is offline
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Quote:
Originally Posted by Larzon View Post
they said that the ignition cylinder lock or switch is worn.
I had to replace mine in my '90, it's easy.
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Old 12-08-2011, 10:29 PM
Larzon Larzon is offline
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Quote:
Originally Posted by REAPER4206969 View Post
I had to replace mine in my '90, it's easy.
Did the switch but I am having the same problem.
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Old 12-08-2011, 11:36 PM
REAPER4206969 REAPER4206969 is offline
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Did you change the cylinder and key?

That's what I did.
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Old 12-08-2011, 11:48 PM
Rebuild101 Rebuild101 is offline
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Look for a bear wire or loose connection in the column
Il bet that's what you will find
I had the same deal
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Old 12-09-2011, 04:10 PM
Plain Jane Plain Jane is offline
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it the key is loose in the ignition lock cylinder then it is probably a bad connection in the cylinder that is getting jostled around when you shift. There is a link about changing the lock cylinder somewhere on the site if you search under ignition lock cylinder replacement or some variation, they new cylinders are around $20 so it is not a huge deal. If the problem persists then you will have to start tracing connections, not a huge deal but time consuming, Good luck! Just a thought, is it the original key from 91 and is it really badly worn? I just replaced my original key, it was so worn that I was worried about it snapping or bending, the new key seems to fit everything better with less wobble in locks and ignition.
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Old 12-10-2011, 06:00 PM
Larzon Larzon is offline
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We switched the key but what is happening is that the key doesn't stay in place after I start it and let go. In order to even shift it into gear, I have to hold the key in place.
Bare with me I'm 15 and don't know the right terms.
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Old 12-10-2011, 06:15 PM
danr1 danr1 is offline
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Quote:
Originally Posted by Larzon View Post
We switched the key but what is happening is that the key doesn't stay in place after I start it and let go. In order to even shift it into gear, I have to hold the key in place.
Bare with me I'm 15 and don't know the right terms.
Sounds like you're suffering the actuator problem and or have a problem with the ignition switch itself. All spring action in the key cylinder originates from the ignition switch via the actuator rod.

Search the forum here for threads/posts about "actuator" and you get more then enough hits to aid you in what you need do.

If you just can't find it post back someone will help ya out directly.
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