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No start drove this truck the other day about twenty miles and it ran fine?

Tiny
NEGGEN
  • MEMBER
  • 1991 FORD F-150
  • 5.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
Drove this truck the other day about twenty miles and it ran fine. Got home and left idling to check the cows, got back in a few minutes later and it shut off when trying to accelerate. Started back up fine but would shut off under load. The next day it would not start at all. Fuel pressure is okay, but no spark. Tested it using a timing light. Had a pre-existing check engine light (just bought this truck a few weeks ago) so I checked the codes. The codes showed 113 (ACT), 116 (ECT) and 636 (Transmission oil temperature out of range). I tested the ICM wire to the coil and it read 0 volt so I replaced it. Now it reads 0.4 volts but still no start. Every once in a while, it will kick over like it tried to fire but will not start.
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Tuesday, April 12th, 2022 AT 6:35 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,785 POSTS
The ECT code is telling us the engine coolant sensor might be shorted out which will make the engine stall and not start because the wrong amount of fuel is being introduced to the engine. I would try unplugging the sensor to see if it starts and if so, replace the sensor. Here is the location in the diagrams below. Check out the diagrams (below). Please let us know what happens.
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Sunday, July 17th, 2022 AT 9:53 AM

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