Hyundai Elantra Check Engine Light Car Shaking

Possible Causes

1. Spark Plugs

Spark plugs are responsible for igniting the air/fuel mixture in the cylinders. If they are worn out or fouled, they can cause the engine to misfire, which can lead to shaking. You can check the spark plugs yourself by removing them and inspecting them for wear or damage. If they look worn, you should replace them.

2. Ignition Coils

Ignition coils are responsible for providing the spark plugs with the electricity they need to ignite the air/fuel mixture. If an ignition coil fails, it can cause the engine to misfire, which can lead to shaking. You can check the ignition coils yourself by using a multimeter to measure the resistance between the terminals. If the resistance is too high or too low, the ignition coil should be replaced.

3. Fuel Injectors

Fuel injectors are responsible for delivering the fuel to the cylinders. If a fuel injector is clogged or damaged, it can cause the engine to run lean or rich, which can lead to shaking. You can check the fuel injectors yourself by using a fuel pressure gauge to measure the pressure in the fuel rail. If the pressure is too low or too high, the fuel injectors should be cleaned or replaced.

4. Vacuum Leaks

Vacuum leaks can cause the engine to run lean, which can lead to shaking. You can check for vacuum leaks by using a smoke machine or a vacuum gauge. If you find a vacuum leak, you should repair it as soon as possible.

5. Mass Airflow Sensor

The mass airflow sensor (MAF) is responsible for measuring the amount of air that is entering the engine. If the MAF is dirty or damaged, it can cause the engine to run lean or rich, which can lead to shaking. You can clean the MAF yourself by using a MAF cleaner. If the MAF is damaged, it should be replaced.

6. Oxygen Sensor

The oxygen sensor is responsible for measuring the amount of oxygen in the exhaust gas. If the oxygen sensor is dirty or damaged, it can cause the engine to run lean or rich, which can lead to shaking. You can check the oxygen sensor yourself by using a multimeter to measure the voltage output. If the voltage output is too low or too high, the oxygen sensor should be replaced.

7. Catalytic Converter

The catalytic converter is responsible for reducing the emissions from the engine. If the catalytic converter is clogged or damaged, it can cause the engine to run poorly, which can lead to shaking. You can check the catalytic converter yourself by looking for any signs of damage, such as dents or holes. If you find any damage, the catalytic converter should be replaced.

Conclusion

If you are experiencing a check engine light and car shaking, it is important to have the problem diagnosed as soon as possible. The problem could be caused by a number of different things, so it is important to have a qualified mechanic diagnose the problem and make the necessary repairs.