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Truck will not started when it is hot outside

Tiny
JO WICKHAM
  • MEMBER
  • 1999 FORD F-150
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 286,000 MILES
We changed the fuel pump and now the truck won't start when it is hot outside, over 85 outside. But when it cools down outside, the truck will start when is below 80 and we can drive the truck to the store.
Friday, July 26th, 2019 AT 2:41 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,787 POSTS
What I need you to do is check to see if there is ignition spark when the engine won't start. The crankshaft position sensor may be going bad. They are known to fail based on heat when they start going bad. Take a look through these links. The first will explain what the sensor does, the second common symptoms, and the third will explain in general how one is replaced. Also, here are directions for testing spark to the plugs. If there is no spark, the sensor is my first suspect.

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Let me know if this helps or if you have other questions.
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Monday, May 31st, 2021 AT 12:42 PM
Tiny
JO WICKHAM
  • MEMBER
  • 1 POST
We just put in the new crank sensor and the truck started, thank you.
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Monday, May 31st, 2021 AT 12:42 PM

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