2005 Dodge Neon with a fuel injector problem causing a P0301 (cylinder #1 misfire code). Had new plugs, wires and coil pack installed prior to me looking at the vehicle. Customer stated car ran good for a few months after the "tune up".

symptoms 50

  • Misfire (especially at a low RPM)

fix 50

  • Replaced faulty fuel injector

test shown enh 50

  • Injector balance test
  • secondary ignition scope tests (lean misfire)
  • rpm/cylinder drop test

Tools used

  • Snap-on Solus Pro
  • Picoscope automotive 4 channel
  • OTC 3398 electronic fuel injector tester

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(Chapters 17, 18 and 19) Fuel Injector Testing

Related videos:

How to identify injector flow problems (Toyota 1.8L) part 1:


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


Injector balance test using a timer tool on a GM 3100 engine:

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

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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.

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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!