Engine will not start up?

J GOWE

MEMBER
1987 FORD F-150
5.0L
V8
2WD
AUTOMATIC
118,000 MILES

Engine runs like a clock until it warms up. Wont start again until it cools off. We have replaced everything even the main brain of the truck and still does the same thing.
Can anyone help? Where is the cam shaft sensor?

Friday, May 15th, 2020 AT 9:07 AM

4 Replies

KASEKENNY

MECHANIC
18,907 POSTS

Your engine operates on a "crank sensor" that is internal to the distributor. It is a hall effect sensor so this would be susceptible to heat and will cause an open circuit until it cools down so it matches what you are seeing. One way to try and confirm this or at least get more evidence of a crank sensor issue or ignition issue, is when the engine stalls and will not restart, pull a spark plug out and connect it back to the wire and then crank the engine holding the plug against the block to see if it sparks. If it does not spark then it is most likely this hall effect sensor in the distributor. See the attached info for more detail.

Let me know what you find and we can go from there. Thanks

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

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Friday, May 15th, 2020 AT 9:22 AM

J GOWE

MEMBER
6 POSTS

Would that be in the top of distributor?
We have replace coil, wires, distributor cap, rotor, fuel filter, fuel pump, fuel flow sensor and the module on side of the distributor. Any thing else we might check?Does have spark after stalls and wont start.

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Friday, May 15th, 2020 AT 9:41 AM

J GOWE

MEMBER
6 POSTS

That was it. A bit to get to but after 9 trips to the parts store and 12 new parts the old girl is running again. Ready to haul more blue crab to market.
Thank you

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Friday, May 15th, 2020 AT 2:03 PM

KASEKENNY