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A port injector flow test is a diagnostic procedure used to measure how much fuel each fuel injector delivers through the intake ports of an internal combustion engine over a specific period. It's commonly used in automotive maintenance and performance tuning to check for:

• Clogged or dirty injectors
   
• Uneven fuel delivery between cylinders
   
• Leaking injectors
   
• Malfunctioning injector solenoids or electronics
   

To ensure consistent and correct fuel flow from each injector, which is critical for engine performance, efficiency, and emissions control.

1. Test Equipment Setup:
    
   • The injectors are either tested on the vehicle (in-situ) using specialized equipment or removed and tested on a flow bench.
      
   • In either case, a measured amount of test fluid or fuel is passed through each injector while it is pulsed open using a controller.
      

1. Flow Measurement:
    
   • The fuel or fluid that comes out of each injector is collected in graduated cylinders or containers.
      
   • The amount of fluid is compared across all injectors to ensure they are delivering evenly and to spec.
      

1. Leak & Spray Pattern Test (optional):
    
   • The injectors may also be checked for leaks when closed.
      
   • The spray pattern is observed to ensure proper atomization.
      

• Good injectors should all deliver similar volumes and have uniform spray patterns.
   
• Bad injectors may show:
   
  • Low flow (clogged or dirty)
     
  • High flow (leaking or stuck open)
     
  • Irregular spray patterns
     

• Diagnosing misfires or rough idle
   
• Engine tuning or modifications
   
• Pre- or post-cleaning injector verification
   
• Preventive maintenance for high-performance engines
   

If you're doing this for a specific engine or vehicle—some setups have unique testing requirements.