Why when your engine light goes out does car idle really high and not want to drive blow black smoke?

When your engine light goes on, it indicates that there is a problem with your engine or its emissions system. If you continue to drive the car with the engine light on, it can cause serious damage to your engine and other components.

One of the things that can happen when you drive with the engine light on is that your car will start to idle really high. This is because the car's computer is trying to compensate for the problem with the engine by increasing the amount of fuel that is being sent to the engine. This can also cause the car to blow black smoke, which is a sign that the engine is not burning the fuel properly.

In addition to these problems, driving with the engine light on can also lead to:

* Reduced fuel economy

* Increased emissions

* Stalling

* Engine damage

* Catalytic converter damage

* Oxygen sensor damage

If your engine light goes on, it is important to have your car diagnosed and repaired as soon as possible. This will help to prevent further damage to your car and avoid costly repairs in the future.