How to Detect Engine Carbon Buildup?

[Rodger]

Signs of engine carbon buildup include: 1. Difficulty starting the engine multiple times when cold, but normal when hot; 2. Unstable engine idling, with fluctuating RPMs; 3. Feeling sluggish and unresponsive while driving, especially noticeable when overtaking with slow acceleration response; 4. Pungent exhaust fumes exceeding emission standards; 5. Increased fuel consumption. Methods to clean engine carbon buildup are: 1. Intravenous cleaning: Hang a bottle-shaped tool above the engine, pour cleaner into it, and introduce it into the engine through a tube to clean the carbon buildup; 2. Machine cleaning: Inject cleaner into a machine, use the machine to pressurize it into the combustion chamber, allowing the cleaner to react with and dissolve the carbon buildup, then extract the waste liquid.