Just been watching some fella on You Tube explaining how to remove carbon buildup on a diesel engine by spraying a fine mist of water into the air intake (after the MAF) with the engine running... Is this guy for real or just another nut job posting dodgy video's ???

Edited 28 April, 20188 yr by Doofy

It's legit, but not for the faint hearted.

 

Water (or rather steam) does a good job of cleaning up the cylinders. If you've ever had a headgasket leaking coolant into a cylinder for a period of time, you'll notice it's lovely and bright and clean.

 

However, the amount of water you'd need to feed into your engine over a period of time is probably a lot more than you'd manage in one sitting. Not to mention if you overdo it, you risk hydrolocking the engine and bending conrods!