Car Engine CYLINDER DROP Test: How to find a MISFIRING cylinder with a scan tool (active scan tool)

I show the car engine cylinder drop test, how to find a misfiring cylinder with a scan tool. This video demonstrates how to deactivate engine cylinders to find a misfire or how to drop cylinders with an active scan tool. The test is also known as a car engine power balance test. I use an Autel scanner, the Autel MP808TS for this active test. It also covers finding faulty injectors. I also cover how to drop cylinders without a scan tool. P0300 misfire is a common challenge to deal with and dropping cylinders to find misfires is one good place to start. Using an active scan tool makes this is a simple DIY car repair procedure for finding a cylinder misfire. How to find car engine cylinder misfires or finding a misfiring cylinder is critical when troubleshooting that car engine running rough. Sometimes, scan tools are not able to show cylinder misfires, because detection thresholds have not been met. I use the control selected cylinder fuel cut active test on the Autel MaxiPRO to achieve this. This is sometimes called the control cylinder fuel cut function. Hope this is useful.
Looking to get the Autel MaxiPRO MP808TS? Get the exact same device from:
Amazon: amzn.to/3mddOH1
OR
Aliexpress: s.click.aliexpress.com/e/_AAGO0F
Disclaimer: I may earn a small commission from purchases made through the links above.
Timestamps
0:00 - Intro
0:30 - Why the cylinder drop test & how it works
1:22 - Cylinder drop test with autel scanner
4:04 - Cylinder drop test without a scanner

[@The123Now]

I absolutely love your videos, very simple, and very educational. I also love your accent. Keep making these awesome videos, just bought the same diagnostic tool as you. thanks for your wonderful help

[@DIYAutoworksNG]

Many thanks for the compliments. Means a lot! Congrats on your new tool. Feel free to reach out should you any support with getting comfortable with the tool.

[@HassanMusa-wh9gv]

Very good 👍

[@DIYAutoworksNG]

Thanks

[@Ken-1]

Can disconnecting the coil electrical connecters whilst the car is running cause in electrical issues (i.e., shorting / damaging ignition or ecm components)?
I think I heard that somewhere before a long time ago but not sure. Thanks!

[@DIYAutoworksNG]

This manual method of dropping cylinders has been in use for years. The correct way of doing it is to disconnect the electrical connector to the coil and not removing the ignition coil from the spark plug with the engine running. This later method is what can damage vehicle electronics...

[@sebczajna700]

hello, when you disconnected the partial injectors, the engine control unit did not read the misfire. that is, the problem was on the side of candles and ignition coils? Best regards from Poland

[@DIYAutoworksNG]

Since this is an active test triggered by the tool, it won't read it as a misfire or show a code. However, if you noticed, the sound and vibration of the engine increased when each injector was dropped. That said, the car I did this test on, does not have a misfire issue.

[@bassamzedan8936]

انتا ممتاز عليك بترجمه جميع الفديوهات بالعربي لان بعض الفديو من دون ترجمه

[@DIYAutoworksNG]

شكرًا جزيلاً. سأبذل قصارى جهدي للترجمة!

[@Khaled-if4xs]

How to compression test by autel maxisys please make a video

[@DIYAutoworksNG]

Thanks for the suggestion. I'll look into it.

[@woodybear8298]

You said if your sound doesn't change, that's your cylinder. I don't understand that.

[@DIYAutoworksNG]

Usually, a good cylinder contributes to the combustion process occurring in the engine. So when you drop that cylinder, it's contribution to combustion would go, and this would reflect in the tone of the engine. A 'bad' cylinder contributes little or nothing to combustion and so when dropped, engine tone won't be noticeably affected.