It's Gumout against carbon and engine knock. Find out what Gumout all in one cleaner did to my combustion chamber. If you are looking for how to stop engine knock or some of the best fuel system cleaner against carbon buildup, you may check out this product. Use of proven fuel additives to clean combustion chamber deposits can be part of a regular tune up, especially if you use low octane fuels. Genuine fuel system cleaners help remove engine deposits. Get from Amazon: - Gumout all in one fuel system: https://amzn.to/3OPia5f - Depstech Dual Lens Wireless Endoscope: https://amzn.to/3kxDIoW I may earn a small commission from a purchase made through the links above. This does not increase the price you pay in any way Time stamps: 0:00 - Intro 0:21 - Engine knock sound & causes of engine knock 1:10 - Inspecting combustion chambers before Gumout all in one 2:17 - 1st shot of Gumout all 3:28 - 2nd shot of Gumout 4:07 - Fresh tank of gas 4:20 - Before and After results 4:35 - Did Gumout clear the engine knock? 5:12 - Final verdict #tuneup #gumout #DIYAutoWorksNG #DIYmechanic #engineknocksound #engineknock