If you’re troubleshooting like having a P0300 fault code “Random or multiple cylinder misfire detected”, you’ll typically need to find a misfiring cylinder. This test is called “Control selected cylinder fuel cut” that Autel MaxiAP AP200 can do it. As we mentioned before, Autel MaxiPRO MP808TS can also do it perfectly. It’ll drop each cylinder in the test. The misfiring cylinder would have the least effect on the vibration of the engine. When you drop a cylinder that’s working well, the tone of the engine should change, and it should vibrate a bit more. Reasons for isolated cylinder misfire There are a number of reasons for isolated cylinder misfires: 1. Dirty, clogged, leaky or broken fuel injector. 2. Weak/defective ignition coil. 3. Worn spark plug, especially for people who don’t replace back plugs as a set. 4. Mechanical issues: burn exhaust valve, blown head gasket. How to find a misfiring cylinder via Autel AP200? This is test on 2...