What Causes the Volkswagen Tiguan's Engine to Shake and the EPC Light to Illuminate?

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The reasons for the Volkswagen Tiguan's engine shaking and the EPC light illuminating are: severe carbon buildup in the engine. The engine's power comes from the downward movement of the piston, which draws a mixture of gasoline and air into the cylinder. The upward-moving piston then compresses this mixture into a highly combustible gas, which is ignited by the spark plug, causing the piston to be pushed by the powerful explosion, generating power and leading to shaking. The source of power is the air-fuel mixture, which must enter the combustion chamber through the intake valve. A small amount of gasoline adheres to the intake valve, and under the engine's high temperature, the unburned hydrocarbons, paraffin, and gum in the gasoline are burned into carbon deposits. If the fuel injector is clogged, the atomization of the injected gasoline is poor, leading to uneven mixing of gasoline and air, which increases the amount of gasoline accumulating on the intake valve.