Which parts of a car need carbon deposit cleaning?

[VanAlexandra]

Parts of a car that require carbon deposit cleaning include: 1. Engine combustion chamber; 2. Intake manifold; 3. Fuel injector; 4. Throttle body; 5. Spark plug; 6. Three-way catalytic converter. Carbon deposits are coke-like substances formed from unsaturated olefins and gums in fuel under high temperatures during engine operation. Methods for cleaning carbon deposits are: 1. Open the engine oil cap, pour in cleaner, close the cap, then idle the engine for about 10 minutes before shutting it off; 2. Remove the engine cover, detach the throttle body and clean it with carburetor cleaner; 3. Pour intake system cleaner into the reservoir of a cleaning device, connect it to the intake system, then start the vehicle to allow vacuum pressure to draw the cleaner into the intake passages.