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In this video I will show you how to identify which cylinder is misfiring using just a scan tool and basic test light. This test can be used when you have a constant misfire on one or more cylinders. Once the specific cylinder is isolated, further testing may be needed to determine whether it is a spark, fuel or compression problem.
Engine Performance Diagnostics chapter 22
- constant misfire
- check engine light (P0300, P0305)
- replace faulty ignition coil assembly
- RPM drop test
- how to short out each plug wire with a test light
- how to determine if the coil is bad or if there is a control issue
- scan tool
- incandescent test light
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(Chapter 22) No Spark Troubleshooting, Ignition Coil & Module Testing
Related videos:
How to identify a shorted ignition coil (Honda):
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Misfire Case Study (1999 Honda Accord):
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Misfire caused by a vacuum leak:
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Ignition testing with a scope (Secondary Waveforms) - open plug wire :
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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!