Why might you need your engine carbon cleaned?

Petrol and diesel engines produce power by burning fuel, and this creates sooty exhaust gasses. Emissions controlled devices such as catalysts and diesel particulate filters keep the amount of soot which reaches the atmosphere to a minimum, but there is still some which is deposited on components inside the engine and exhaust system.

Petrol cars are usually less susceptible to "clogging up" as the fuel is quite good at cleaning the components as its passing through.

However, many modern engines use direct injection to improve efficiency where petrol is squirted directly into the combustion chamber and does not get passed over many parts.

Diesels are even more likely to be affected, as the fuel does not burn as cleanly, the exhaust gases are often fed back into the combustion chamber to be burned again, this movement of sooty fumes and gasses are bound to result in a build up of deposits over time. Once the fumes are finally expelled from the engine they still have to pass through the catalyst and diesel particulate filter. These too can become clogged with carbon deposits.

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