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This is a 2003 Pontiac Vibe with a 1.8L Toyota engine. The customer replaced the spark plugs, ignition coils, MAF sensor and other components in an unsuccessful attempt at fixing this misfire. I decided this would make a great case study for my class at Rosedale Technical College and for you, my YouTube students!

Engine Performance Diagnostics chapter 18 page 26

symptoms 50

  • rough idle
  • misfire
  • check engine light (P0300, P0301, P0302, P0303, P0304)

fix 50

  • replace restricted injectors (cleaning procedure shown in part 2)

test shown enh 50

  • how to perform an injector balance test
  • how to monitor injector flow with a pressure transducer and a lab scope
  • how to use fuel trim to determine type of lean condition

Tools used

  • Picoscope
  • Fluke PV350 pressure transducer
  • fuel pressure gauge (test kit)
  • fuel injector balance tester (timer tool)

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(Chapters 17, 18 and 19) Fuel Injector Testing

Related videos:

How to identify injector flow problems (Toyota 1.8L) part 2:


How to test a fuel injector for flow problems (GM):


Fuel injector flow testing (a free ScannerDanner Premium video):


Misfire from restricted injectors - Chevy Prism (Toyota 1.8L) part 1:


Misfire from restricted injectors - Chevy Prism (Toyota 1.8L) part 2:


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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available as an eBook or paper book.

Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium. There is a 14 day free trial.

On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!