After the car stopped for a few days, it ignited and emitted black smoke.

Hello, this situation, 1: indicates that the engine mixture is too rich, resulting in insufficient combustion, poor spark plug, faulty ignition coil, dirty throttle, etc. 2. Check whether the steam filter is blocked, whether the pump pressure of the gasoline pump is sufficient, and whether the fuel nozzle is blocked. The exhaust system is blocked. Check whether the three-way catalyst and the whole exhaust pipe are blocked. 4. Check whether the throttle position sensor needs cleaning. If it is dirty, the engine computer cannot accurately receive the acceleration information given by the driver. 5. Check whether the air filter element is dirty. This thing will lead to insufficient air intake, asymmetric mixing ratio and black smoke. I wish you a happy car. Ask the car master. 4S shop professional technician, 10 minutes to solve.