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No spark

Tiny
FORD1734
  • MEMBER
  • 1997 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 195,000 MILES
My truck does not start, I check te coils power the positive is ok. The negatives, look does not get flash, I changed crankshat sensor, camshaft sensor, coils, the truck star one day and runs great, but when I tried to start again just turn but don't start, he tried to star two times keeps on couple second and suddenly shuts off, when I conetc a code reader just give the message ERROR, somebody please have a clue about this.

Thanks
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Thursday, August 26th, 2010 AT 3:10 PM

9 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Check the wiring harness to the PCM and make sure it is tight and clean. Keep in mind, the ignition module is an integral component in the PCM. If it is bad, the PCM will need replaced. Also, make sure the theft light isn't staying on.

Let me know what you find.

Joe
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Sunday, January 5th, 2020 AT 2:15 PM
Tiny
FORD1734
  • MEMBER
  • 5 POSTS
I clean the wiring harness, iI replace the pcm with one with the same caracteristics, from a working truck, and nothing, My truck does not have theft system, I feel frustrated with this think.
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Sunday, January 5th, 2020 AT 2:15 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Did the PCM have the same part number?
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Sunday, January 5th, 2020 AT 2:15 PM
Tiny
FORD1734
  • MEMBER
  • 5 POSTS
Yes the pcm is the specific model for my truck, Today I put some starting fluid and the truck tried to start, I look for some kind of sound from the fuel punp when I put the key in on position, and there is not a hummning is just a little noise. But I replaced the pump before. Not for a new one but for one in good condition.
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Sunday, January 5th, 2020 AT 2:15 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
It sounds like the fuel pump is bad. Have you checked fuel pump pressure?
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Sunday, January 5th, 2020 AT 2:15 PM
Tiny
FORD1734
  • MEMBER
  • 5 POSTS
No.I don't know how to do it, Do I ned some kind of tool?
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Sunday, January 5th, 2020 AT 2:15 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Here are directions and a video for checking fuel pump pressure. It is easy to do, but you will need a fuel pressure gauge. Most parts stores will lend or rent them to you.

https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm

Let me know what you find.

Joe
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Sunday, January 5th, 2020 AT 2:15 PM
Tiny
FORD1734
  • MEMBER
  • 5 POSTS
Tre truck start s very good one day with no problems after change the pcm, runs about three or four days with no problems, but suddenly one day turns off when is moving, an then don want start again after a couple hours, then she start again with no problems, same thing runs for one, two days and sudddenly do the same thing, one day she atart with starting fluid, but other days don't, I don't know if is a coincidence but the two time she tuns off was raining.
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Sunday, January 5th, 2020 AT 2:15 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
If it doesn't start with starting fluid, then the problem lies in the ignition system. Yes, rain can play a role in the problem.

What I need you to do is a simple test. At night, in the dark, start the engine, open the hood, and mist water on the ignition components to see if anything is arcing. It there is an arc, replace that component.
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Sunday, January 5th, 2020 AT 2:15 PM

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