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Mar 23, 2023 | 09:41 PM

Lonnie Lay

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4wd High

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no fire

my brother has a 1996 ford f450 with the 460 engine , he can be driving down the road and it shuts off , let it set 20 minutes or so and starts back , or he can drive somewhere shut it off and go back to start it and will not start until it sets 20 minutes or so no fire when this happens , any ideas?

Mar 24, 2023 | 02:46 PM

sswari

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It will turn over but not start, or it does not turn over at all?

Mar 24, 2023 | 03:56 PM

Prototypemech

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From: Mojave, Ca

Historically, this is caused by a bad ignition switch, below the steering column. Could also be a bad TFI module, or a bad connection on your ignition coil.

Mar 24, 2023 | 04:05 PM

sswari

Tuned

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A starter that is on the way out will also act like this. Crawl under and tap the starter with a wrench or hammer. Worked for me for a year or so before starter left the building.

Mar 24, 2023 | 04:11 PM

Prototypemech

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From: Mojave, Ca

Quote:

Originally Posted by sswari

A starter that is on the way out will also act like this. Crawl under and tap the starter with a wrench or hammer. Worked for me for a year or so before starter left the building.

From what I gather, the engine is cranking fine, its just not starting or "firing". I would not focus on the starting system. Focus on the ignition system. Start with the ignition switch.

Mar 24, 2023 | 04:30 PM

sswari

Tuned

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Quote:

Originally Posted by Prototypemech

From what I gather, the engine is cranking fine, its just not starting or "firing". I would not focus on the starting system. Focus on the ignition system. Start with the ignition switch.

That is not 100% clear to me. Which is why I had asked.
If it is turning over, will a bad Ignition switch keep it from firing up? I would start with spark at the plugs and work my way back from there. Then fuel.

Mar 24, 2023 | 05:42 PM

Mo8414

Mountain Pass

Joined: Dec 2018

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Same thing my truck would do when I needed a new distributor. Sensor inside was fine till it got warm then would kill the truck like fliping a switch

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Mar 24, 2023 | 08:40 PM

Prototypemech

Logistics Pro

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From: Mojave, Ca

You might also want to check the P fuse in the engine compartment fuse box for any sign of overheating, arcing, or for a melting plastic fuse terminals holder.