Top 10 7.3 Diesel Hard Start / No Start Diagnostic Procedures

Top 10 things to check when diagnosing a Hard or No start condition on a 7.3 Power Stroke Diesel.

There are quite a few things that may cause the 7.3 V8 diesel engine to not start. Usually it’s pretty basic stuff, but tracking down the issue can be a headache without a good starting point. If your Ford 7.3L Power Stroke diesel engine isn’t starting check the following items:

  1. Visual Engine / Chassis Inspection
  2. Check Engine Oil Level
  3. Intake / Exhaust Restriction
  4. Sufficient Clean Fuel
  5. Fuel Pump Pressure
  6. Perform KOEO On-Demand Self Test
  7. Retrieve / Clear Continuous DTCs
  8. KOEO Injector Electrical Self Test
  9. Check VPWR During Cranking
  10. Glow Plug System Operation

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One Comment

  1. I have a 1988 Ford F350 7.3 l. Non-turbo. Can be extremely hard to start two brand new batteries. If I give it just a little shot of ether. It’ll fire right up. Even after I lent the glow plugs cycle as I crank it over it gets to the point where it will barely turn but as a starter takes over it’ll fire up. Also, in the visor it says to hold it to the floor and cold temperatures while starting. Is this recommended? What could be the problem? It used to crank over fine

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