https://stream.echo6.co/videos/watch/26fc3aeb-021b-40e9-a131-45833494d3e4 In this video, we’re working through a misfire on a 2019 Hyundai Tucson using scan data, a brake torque test, a cylinder drop test, and some good old-fashioned swaptronics. The scan tool gives us a direction, but the misfire counters aren’t consistent enough to be the whole answer by themselves. So the question becomes: can we prove the problem by moving parts around and watching what happens? This is a simple but important misfire diagnostic path: don’t guess, don’t rely on one data point, and don’t let “swaptronics” turn into parts changing. Used correctly, it can be a valid test. 🔧 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 https://www.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 00:00 - Shop plan and 2019 Hyundai Tucson misfire complaint 01:16 - Random misfire and cylinder 4 misfire codes 01:44 - Brake torque test and ignition misfire feel 02:00 - Watching misfire counters during the test drive 03:16 - Why misfire counters cannot always be relied on 04:02 - Diagnosing the misfire without secondary ignition scope data 04:39 - Cylinder drop test by unplugging coils 05:29 - Swapping spark plugs to see if the misfire moves 06:48 - Why intermittent misfires make swap testing harder 08:04 - Test drive after swapping plugs 08:40 - Misfire stays on cylinder 4 after plug swap 10:25 - Swapping ignition coils and retesting 10:49 - What an ignition misfire feels like under load 11:24 - Misfire moves to cylinder 1 after coil swap 13:28 - Confirming the bad coil and explaining the swaptronics path 14:37 - Is it safe to unplug coils with the engine running? 15:26 - Other ways to identify a constant misfire ⚠️ 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. Wed, 06 May 2026 02:09:16 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/26fc3aeb-021b-40e9-a131-45833494d3e4 All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.