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WARNING! I WILL NOT BE RESPONSIBLE IF YOUR ENGINE IS DAMAGED ARISING FROM THIS POST! Today, I tried to de-carbon my engine. After AUTO RX treatment, and a rinse phase. Since I was going to change spark plugs, engine oil and filter anyway, I thought it was a good time to de-carbon. I used a rather radical method, and not many people may be comfortable with it, but my engine felt a bit "lighter" - more responsive - after the process. not much needed: 1. 1.5L cold water (preferably distilled) 2. A screw driver 3. Open bowl/container with flat base 4. double side tape Here goes after warming up your engine: 1. attach the container with double-sided tape to your battery. 2. fill it up with water 3. increase idle rev to about 2,000 - 2,500 using your screw driver 4. unplug the vacuum hose from your distributor or PCV valve NOW BE VERY CAREFUL HERE 5. Put the vacuum hose just above the water surface (NOT INTO THE WATER.) I repeat, NOT INTO THE WATER! Just above the water surface. the vacuum will create enough force to suck up the water. it will look like a tornado between the hose and the water surface. REMEMBER! DO NOT DIP THE HOSE INTO THE WATER - it will hydrolock your engine (engine tio siong), as water cannot be compressed. 6. Make sure the engine does not die. listen very carefully to the engine. and give extra throttle if needed. 7. once the water has run out, be sure to drive around for about 15-20 minutes. try to keep revs higher than usual. oh btw, it's great way to smoke out mosquitoes! white steam/smoke coming out of the exhaust. be sure not to do in an open air car-park with four point-blocks surrounding. sure kena complain. find an industrial park or something during the weekends. how it works: the water being sucked in will create a mist when it enters the cylinder chamber. the cold moisture will react with the hot carbon and it will loosen them out. however, if you are having oil leaks already, do not try this - it will worsen the situation. just for reference i'm using 10W-30 oil without any oil consumption.