In this video I will cover secondary ignition misfire diagnosis using a lab scope. The following waveforms will be shown:

  • A no fuel misfire
  • An open plug or wire
  • A shorted plug or wire
  • A coil output test

 

Engine Performance Diagnostics chapter 1 pages 13-15

Playlist

(Chapter 1) Misfire ID, Compression Tests, Vacuum Leaks, Fuel Trim, Head Gasket, Restricted Exhaust, Low Power, DMM

Related videos:

How to find a misfire with no trouble codes (uScope):

Ignition testing with a scope (Secondary Waveforms) - open plug wire:

What does an open plug wire look like on a lab scope (uScope):

Misfire Case Study (1999 Honda Accord):

end faq


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!

 

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