What are the symptoms of throttle carbon deposition?

Throttle carbon deposit will have the following symptoms: 1. When carbon deposits are attached to the exhaust valve, the intake and exhaust valves are not tightly closed, resulting in air leakage and pressure drop in the engine cylinder. The direct result is that the engine is difficult to start at idle speed, and jitter occurs; 2. At the same time, it affects the cross section of the mixture entering the combustion chamber, and the carbon deposit can adsorb a certain mixture, thus reducing the engine power; 3. Excessive carbon deposition in the intake valve leads to difficulty in intake, which affects the engine for a long time and leads to engine damage. So when too much carbon is found, you should go to the repair shop to clean it in time.