No start

1990 FORD F-350
85,000 MILES • 7.5L • V8 • 2WD • AUTOMATIC
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JHUGHES357
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  • 6 POSTS
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.
Jun 1, 2019 at 11:42 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 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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Jun 2, 2019 at 12:43 AM
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JHUGHES357
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  • 6 POSTS
14.2 volts on the battery 5-7 volts at the injectors should be right on the money.
Jun 2, 2019 at 10:16 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
The injector needs 12.4 to work. Inspect the harness for any corrosion or other damage.

Roy
Jun 2, 2019 at 11:04 PM
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JHUGHES357
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Would there be any other cause of low volts to the injectors?
I will check the harness.
Jun 2, 2019 at 11:33 PM
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JHUGHES357
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Thanks for the reply.
Jun 2, 2019 at 11:40 PM
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ASEMASTER6371
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corrosion or a wire ready to break.

Roy
Jun 3, 2019 at 5:43 AM
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JHUGHES357
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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
Jun 3, 2019 at 5:49 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
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Not the ECM. The voltage comes from the power relay.

Check the harness.

Roy
Jun 3, 2019 at 5:54 AM
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JHUGHES357
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  • 6 POSTS
Thanks I will, and get back to you.
Do you mean the EEC relay?
Jun 3, 2019 at 6:56 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Correct.

Roy
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Jun 3, 2019 at 7:11 AM
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