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Ignition module?

Tiny
MR.ROSE82272
  • MEMBER
  • 1993 FORD F-150
  • 4.9L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
When I try to start my truck for the first time of the day I have to leave the key on and wait about 15 to 20 minutes until the fuel pump primes and finally stops before it will start. Then it will crank up quicker the rest of the day unless it sets for a while. I've replaced the fuel pressure regulator, fuel filter, front tank fuel pump. I'm at a loss?
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Sunday, October 4th, 2020 AT 7:36 AM

10 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I would suspect the ignition module or the pick up coil in the distributor.

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

Roy

Removal

1. Remove two screws retaining ignition control module heatsink assembly to left fender apron.
2. Disconnect harness connector from ignition control module .
3. Remove two screws retaining ignition control module to heatsink and remove ignition control module .

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Wednesday, January 20th, 2021 AT 12:30 PM
Tiny
MR.ROSE82272
  • MEMBER
  • 6 POSTS
Is there a way to test or do you just wing it? Inni mini mini mo it which one. Would you try first? Lol
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Wednesday, January 20th, 2021 AT 12:30 PM
Tiny
MR.ROSE82272
  • MEMBER
  • 6 POSTS
Sorry, just seen the link.
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Wednesday, January 20th, 2021 AT 12:30 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
When it does not start, use a test light.

You hook the alligator clip to the negative battery cable and the probe on the negative side of the coil.

With the key in the on position. the light should light. Then have someone crank the engine. The test light should flash.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Roy
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Wednesday, January 20th, 2021 AT 12:30 PM
Tiny
MR.ROSE82272
  • MEMBER
  • 6 POSTS
Will that tell which to replace first ignition module or pick up in distributor?
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Wednesday, January 20th, 2021 AT 12:30 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
That is just to test if the spark system is working.

One step at a time.

Roy
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Wednesday, January 20th, 2021 AT 12:30 PM
Tiny
MR.ROSE82272
  • MEMBER
  • 6 POSTS
Okay, I did the test on the coil and it lights up when I turn the key on and flashes when I crank the truck.
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Wednesday, January 20th, 2021 AT 12:30 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Do you have spark at the plugs? If you do not, then you need a coil. The module and pickup are working.

Roy
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Wednesday, January 20th, 2021 AT 12:30 PM
Tiny
MR.ROSE82272
  • MEMBER
  • 6 POSTS
No, there's no spark at the plug. So you believe it's a coil? I hope so. This has been on going. The thing that was throwing me off is when I leave the key on for about 15 minutes it will start and run fine. I'll replace the coil and let you know what happens. Thanks
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Wednesday, January 20th, 2021 AT 12:30 PM
Tiny
ASEMASTER6371
  • MECHANIC
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You are welcome.

Make sure the wires, cap and rotor are good as well.

Roy
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Wednesday, January 20th, 2021 AT 12:30 PM

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