Spray a two second burst of Nulon Foaming Cleaner into each spark plug hole and leave the foam to soak in for five minutes. Step 3 Place clean paper or cloth over the spark plug holes and crank the engine to remove any excess liquid before reinstalling the spark plugs. Step 4Start by cleaning the inner housing and wipe the rag along the entire surface. Open the throttle blades with the throttle control. Wipe the inside and outside of the throttle blades carefully but aggressively enough to remove carbon build-up. Continue to add throttle body cleaner if the rag begins to dry or there is excess carbon build up. A device is fitted to the engine that uses chemical removals to remove the build up of carbon from the inlet system and EGR valve. Manual Removal Recommended for all types of carbon build up – but essential in cases of heavy build up this process involves both a manual strip down and the parts ultrasonically cleaned, along with our chemical removal process to ensure the ports and valves are cleaned thoroughly. Mar 05, 2015 · We see quite a few Mini Coopers with direct injection engines that have carbon build-up on the intake valves. While direct injection engines do offer enhanced fuel performance and cleaner emissions, these engines are more likely to have an issue with carbon build up on the intake valves. Here are five Q&A’s related to intake valve carbon ... Mar 11, 2020 · If the engine runs efficiently and idle time is limited, then every 100,000 miles, remove the turbine housing and clean off the carbon from the vanes and ring. Replace oxygen sensor: Most light-duty Tier 4 engines employ an oxygen sensor. Feb 18, 2020 · Like the other cleaners, the STP Super Concentrated Fuel Injector Cleaner works to remove deposits on your fuel injectors. However, because of its potent formulation, it goes beyond mere carbon buildup and also removes varnish and gum deposits—two additional issues that can lead to clogs.