Shuts off over 1500 rpm's

1996 FORD F-350
100,000 MILES • 6.9L • V8 • 4WD • AUTOMATIC
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CRAIG STURTEVANT
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This is just a plow truck. The engine is a 460. It goes for about one hour or so and shuts off with no warning. let it cool off starts up like always. No codes at the Ford dealer. One time I was parking it and raced the engine and it would shut off the minute it hit 1500 rpm's on the tachometer let up the gas and it would stay running.. Every time it stop running it is working hard over 1500 rpm's . The Ford dealer ship has given up. I am desperately needing help.
Jan 11, 2018 at 10:43 AM
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STRAILER
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Hello,

This sounds like you have an ignition switch that has worn out. Through the years the contacts become heated and then they stop working after a short time.

Here is a guide to help you replace the switch and the wiring diagrams to help you confirm the failure:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the diagrams (below).

Please let us know what you find.

Cheers, Ken
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Jan 12, 2018 at 2:57 PM
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CRAIG STURTEVANT
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Just to verify are you saying the key switch That would make it just shut off. And have to wait and let it cool off to start again. The Ford dealer through up there hand today and said to take it home and good luck. What about I think they said IPS. They just want to throw parts at it.
Jan 12, 2018 at 3:18 PM
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STRAILER
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Yes, classic ignition switch 80% sure. You can test through the switch to confirm when the engine stalls the power will stop coming through the switch at it will be warm.
Jan 12, 2018 at 5:28 PM
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CRAIG STURTEVANT
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Thanks. Wait until I tell Ford dealer ship to change switch. Big job?
Jan 12, 2018 at 6:13 PM
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STRAILER
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It should be about $250.00 parts and labor.
Jan 13, 2018 at 6:43 PM
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CRAIG STURTEVANT
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Got one at autozone for $18.00 shop going to put in on mon. Service guy not impressed LOL
Jan 14, 2018 at 5:33 AM
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STRAILER
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Yep saving money what we do let me know what happens.
Jan 15, 2018 at 11:01 AM