Uploaded May 2026 | Updated September 2026, 3 weeks ago
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Whether you're a DIYer, an aspiring tech, or a working technician, ScannerDanner Premium gives you in-depth diagnostic training built around real testing and real troubleshooting:
👉 Join Here – 14 Days for $1
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On ScannerDanner Premium, you'll get:
*In-depth classroom lectures based on the material in my book
*Case studies with real vehicles brought into class
*Troubleshooting using proven diagnostic methods
*Access to our private forum
*Fundamental training in automotive electrical, electronics, and drivability diagnostics
📘 Want to Learn More About Diagnostics?
Check out my field manual, Engine Performance Diagnostics, available as both an eBook and paperback at:
👉 https://linktr.ee/scannerdanner
ScannerDanner Tools:
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⚠️ Disclaimer:
ScannerDanner LLC is not responsible for misuse, unauthorized changes, or incorrect application of any information provided. Always follow proper safety protocols when using tools, equipment, or procedures discussed in this video. Use this content at your own risk.
🔧 Looking for Deeper Training?
Whether you're a DIYer, an aspiring tech, or a working technician, ScannerDanner Premium gives you in-depth diagnostic training built around real testing and real troubleshooting:
👉 Join Here – 14 Days for $1
scannerdanner.com/join-scannerdanner-premium.html
On ScannerDanner Premium, you'll get:
*In-depth classroom lectures based on the material in my book
*Case studies with real vehicles brought into class
*Troubleshooting using proven diagnostic methods
*Access to our private forum
*Fundamental training in automotive electrical, electronics, and drivability diagnostics
📘 Want to Learn More About Diagnostics?
Check out my field manual, Engine Performance Diagnostics, available as both an eBook and paperback at:
👉 https://linktr.ee/scannerdanner
ScannerDanner Tools:
https://linktr.ee/scannerdanner
⚠️ Disclaimer:
ScannerDanner LLC is not responsible for misuse, unauthorized changes, or incorrect application of any information provided. Always follow proper safety protocols when using tools, equipment, or procedures discussed in this video. Use this content at your own risk.
![Active ABS Wheel Speed Sensor Testing and Wiring Repair [09 Silverado]
Active ABS Wheel Speed Sensor Testing and Wiring Repair [09 Silverado] Active ABS Wheel Speed Sensor Testing and Wiring Repair [09 Silverado]](https://i.ytimg.com/vi/ErbK7RqNhXw/mqdefault.jpg)

![This Car Still Doesnt Start! [What did I miss?]
2008 Chevy Aveo no start troubleshooting. Here is the original video https://youtu.be/vKagaBSB2qk where we find the coil boot holes filled with oil. After this repair, this engine still doesnt start. What did we do wrong? What did I miss?
📘 Want to Learn More About Diagnostics?
Check out my field manual, Engine Performance Diagnostics, available as both an eBook and paperback at:
👉 https://linktr.ee/scannerdanner
🔧 Looking for Deeper Training?
Whether youre a DIYer, an aspiring tech, or a professional looking to sharpen your skills, join ScannerDanner Premium for next-level diagnostics training:
👉 Join Here – 14 Days for $1
https://www.scannerdanner.com/join-scannerdanner-premium.html
On ScannerDanner Premium, youll get:
*In-depth classroom lectures straight from my book
*Exclusive case studies with live vehicles pulled into class
*Real-time troubleshooting using proven methods
*Post help requests on our forum
*Fundamental training on diagnosing automotive electrical and electronics systems.
ScannerDanner Tools:
https://linktr.ee/scannerdanner
⚠️ Disclaimer:
ScannerDanner LLC is not responsible for misuse, unauthorized changes, or incorrect application of any information provided. Always follow proper safety protocols when using tools, equipment, or procedures discussed in this video. Use this content at your own risk. This Car Still Doesnt Start! [What did I miss?]](https://i.ytimg.com/vi/FWsoAay9ec8/mqdefault.jpg)
![1985 22RE First Start After Replacement Engine [Lots of Problems!]
1985 22RE First Start After Replacement Engine [Lots of Problems!] 1985 22RE First Start After Replacement Engine [Lots of Problems!]](https://i.ytimg.com/vi/FcLoxQyuIVk/mqdefault.jpg)




![Idle-Only Misfire Diagnosis — Engine Mechanical or Ignition Fault?
2008 Chevy Avalanche with an idle-only misfire and a P0300 random misfire code. In this lesson, I use misfire counters and secondary ignition testing to isolate the dominant cylinder and prove the fault without guessing.
This is a great example of why a random misfire code does not mean every cylinder deserves equal attention. Cylinder 1 stood out immediately in the data, and the secondary ignition pattern supported that direction. The fault ended up being a bad spark plug with a cracked porcelain, and moving the plug moved the bad pattern and the miss.
In this video I cover:
• Using history and current misfire counters to choose direction
• Why one cylinder can cause a P0300
• Secondary ignition waveform analysis on a coil-over-plug system
• Burn time changes and what they can mean
• Why idle-only misfires often make you suspect a mechanical issue first
• Using a swap test to confirm the fault
• Why misfire counters help, but should not be blindly trusted
Timestamps:
Misfire counters and P0300 direction [00:00]
Cylinder 1 stands out in the data [00:27]
Idle-only misfire: initial diagnostic thoughts [01:04]
Secondary ignition setup and waveform review [01:17]
Cylinder 1 burn time inconsistency [02:18]
Comparing cylinder 1 to known good cylinders [03:31]
Mechanical suspicion vs ignition fault [04:26]
Spark plug inspection changes the direction [05:04]
Cracked porcelain found on cylinder 1 plug [05:20]
Swap test setup and verification [06:08]
Bad waveform moves with the spark plug [06:29]
Misfire counters after the plug swap [07:16]
Final diagnosis and repair recommendation [08:14]
🔧 Looking for deeper training?
Join ScannerDanner Premium for next-level diagnostics training:
👉 Join Here – 14 Days for $1
https://www.scannerdanner.com/join-scannerdanner-premium.html
On ScannerDanner Premium, you’ll get:
• In-depth classroom lectures straight from my book
• Exclusive case studies with live vehicles pulled into class
• Real-time troubleshooting using proven methods
• Ability to post help requests on our forum
• Fundamental training on automotive electrical & electronics diagnostics
📘 Want to learn more about diagnostics?
Check out my field manual Engine Performance Diagnostics, available as both an eBook and paperback:
👉 https://linktr.ee/scannerdanner
🧰 ScannerDanner Tools:
https://linktr.ee/scannerdanner
⚠️ Disclaimer:
ScannerDanner LLC is not responsible for misuse, unauthorized changes, or incorrect application of any information provided. Always follow proper safety protocols when using tools, equipment, or procedures discussed in this video. Use this content at your own risk.
#P0300 #MisfireDiagnosis #SecondaryIgnition Idle-Only Misfire Diagnosis — Engine Mechanical or Ignition Fault?](https://i.ytimg.com/vi/GRK4V535C3o/mqdefault.jpg)

