Was running fine. All of a sudden it shut off and won't start.

1997 FORD F-150
300,000 MILES • 4.6L • V8 • 4WD • AUTOMATIC
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JEREMY FORD
  • MEMBER
  • 8 POSTS
was running fine. All of a sudden it shut off and won't start. Very low pressure at fuel rail but pressure is there and getting no spark. Fusses are all good. No codes, i'm out of ideas.
Aug 5, 2020 at 12:52 PM
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JACOBANDNICKOLAS
  • Experienced Mechanic
  • 110,240 POSTS
Hi,

Since fuel pressure has been lost as well, lets start by resetting the inertia switch. It is designed to shut down the fuel system if there is an accident. Here are the directions for replacement. I'm providing them to help you locate it. There will be a reset switch to press. Just do that and not the removal process. Check out the diagrams (Below).

1. Disconnect the battery ground cable.

NOTE: When the battery is disconnected and reconnected, some abnormal drive symptoms may occur while the vehicle relearns its adaptive strategy. The vehicle may need to be driven 16 km (10 mi) or more to relearn the strategy.

2. Remove the RH cowl side trim panel.

3. Disconnect the inertia fuel shutoff switch electrical connector.

4. Remove the inertia fuel shutoff switch.
1 Remove inertia switch bolts.
2 Remove the inertia fuel shutoff switch.


Next, if spark was lost first, the computer may be shutting down fuel because there is no ignition taking place. To get specific information, I need the build date of the vehicle which is located on either the driver's door or the door frame. Let me know that.

I want you to also check if the tachometer is moving a bit when cranking. If you have no tachometer, then a live data scan tool is needed to check for an RPM signal. I'm questioning the crankshaft position sensor.

Take a look through these two links. The second one describes symptoms. Let me know if they mirror what you experienced.

https://www.2carpros.com/articles/how-a-crank-shaft-angle-sensor-works

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

If you look at pic 5, I attached a picture of the sensor. It is usually hidden behind the AC compressor.

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
Apr 26, 2021 at 6:11 AM
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JEREMY FORD
  • MEMBER
  • 8 POSTS
Thank you. I will try this and check out the other sensor. The build date is 06/97.
Apr 26, 2021 at 6:11 AM
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JACOBANDNICKOLAS
  • Experienced Mechanic
  • 110,240 POSTS
You are very welcome. Let me know what you find. I'm interested in knowing.

Take care,
Joe
Apr 26, 2021 at 6:11 AM
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JEREMY FORD
  • MEMBER
  • 8 POSTS
Turned out to be the crank sensor.
Apr 26, 2021 at 6:11 AM
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JACOBANDNICKOLAS
  • Experienced Mechanic
  • 110,240 POSTS
Hi,

Glad to hear you got it going. I was suspecting that could be the issue. However, I wanted to start with the reset first.

Thanks for letting me know. Chances are it will help others in the future. Also, feel free to come back any time in the future.

Take care,
Joe
Apr 26, 2021 at 6:11 AM
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