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Tiny
JHUGHES357
  • MEMBER
  • 1990 FORD F-350
  • 7.5L
  • V8
  • 2WD
  • AUTOMATIC
  • 85,000 MILES
Just stopped starting, it will run easily with starting fluid in the throttle body. I have replaced everything from the fuel pump, relay, EEC relay, ignition coil, ignition control module, ECM, distributor, injectors, and battery. Checked the inertia switch and even bypassed on a test, the spout sensor, I have 5-7 volts at the injectors, 40+ psi at the rail and it will not start. I have no idea but it seems that the injectors will not open.
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Sunday, June 2nd, 2019 AT 6:42 AM

10 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

5 to 7 volts is no good. You need battery voltage or at least 12.4 volts for them to work.

What is the battery voltage?

Roy
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Sunday, June 2nd, 2019 AT 7:43 AM
Tiny
JHUGHES357
  • MEMBER
  • 6 POSTS
14.2 volts on the battery 5-7 volts at the injectors should be right on the money.
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Monday, June 3rd, 2019 AT 5:16 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
The injector needs 12.4 to work. Inspect the harness for any corrosion or other damage.

Roy
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Monday, June 3rd, 2019 AT 6:04 AM
Tiny
JHUGHES357
  • MEMBER
  • 6 POSTS
Would there be any other cause of low volts to the injectors?
I will check the harness.
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Monday, June 3rd, 2019 AT 6:33 AM
Tiny
JHUGHES357
  • MEMBER
  • 6 POSTS
Thanks for the reply.
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Monday, June 3rd, 2019 AT 6:40 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Corrosion or a wire ready to break.

Roy
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Monday, June 3rd, 2019 AT 12:43 PM
Tiny
JHUGHES357
  • MEMBER
  • 6 POSTS
Is it possible the ECM is not giving a full signal? The ECM is new. I will check the connection and wires at the harness is there anywhere else to look for low volts?
Thanks again
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Monday, June 3rd, 2019 AT 12:49 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Not the ECM. The voltage comes from the power relay.

Check the harness.

Roy
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Monday, June 3rd, 2019 AT 12:54 PM
Tiny
JHUGHES357
  • MEMBER
  • 6 POSTS
Thanks I will, and get back to you.
Do you mean the EEC relay?
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Monday, June 3rd, 2019 AT 1:56 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Correct.

Roy
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Monday, June 3rd, 2019 AT 2:11 PM

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