What Causes the Engine Malfunction Light to Illuminate and the Engine to Shake?

[DelMarcus]

The reasons for the engine malfunction light illuminating and the engine shaking are: 1. Poor combustion of the air-fuel mixture in the engine, abnormal fuel supply pressure; 2. Carbon deposits inside the engine cylinders; 3. Poor fuel quality. The methods to address the engine malfunction light are: 1. Start the engine and activate the self-inspection function; 2. Turn off the engine and restart it to check if the engine malfunction light still alerts; 3. Replace with high-quality engine oil. The maintenance methods for the engine include: 1. Use high-quality engine oil; 2. Use qualified coolant; 3. Regularly clean the radiator scale; 4. Periodically remove carbon deposits from the car; 5. Replace the car's three filters on time; 6. Maintain a reasonable engine speed.

[LaMorgan]

My car had the same issue a few days ago. The check engine light suddenly came on, accompanied by severe shaking, especially noticeable when idling. Common causes include worn-out spark plugs leading to ignition failure, clogged fuel injectors affecting fuel delivery, or a dirty mass airflow sensor causing air-fuel ratio imbalance. Insufficient fuel pump pressure or damaged ignition coils can also trigger shaking and the warning light. If a cylinder misfires, the car vibrates intensely, feeling like a tractor boiling over. I later used a scanner to read the trouble codes and found it was a problem with the third cylinder's spark plug. After replacement, everything returned to normal. I recommend getting it checked at a professional shop as soon as symptoms appear—don't try DIY fixes to avoid worsening engine damage. Regularly replacing spark plugs and fuel filters can effectively prevent such issues. After all, safe driving comes first.

[StColton]

This issue is common in repair shops. The engine warning light comes on accompanied by shaking, mainly due to ignition system defects. Worn spark plugs or faulty ignition coils causing misfires lead to increased engine vibration. Fuel system issues like carbon-clogged injectors or a failing low-pressure fuel pump result in uneven fuel supply. It may also involve faulty sensors such as oxygen sensors or crankshaft position sensors. When addressing this, I emphasize checking OBD trouble codes for precise diagnosis, like code P0300 indicating random misfires. Simple steps include inspecting spark plug condition and checking for loose wiring connections. Prompt repairs prevent increased fuel consumption and excessive emissions, so pay attention to these components during maintenance.

[ZaneLee]

The engine warning light is on and there is shaking, possibly due to combustion issues causing unstable driving. Causes include untimely ignition of spark plugs, clogged or non-functioning fuel injectors, dirty air filters, and faults triggered by details such as vacuum leaks. This condition increases fuel consumption and harmful emissions, so it's necessary to quickly check the OBD codes and clean the intake system. Regular maintenance can reduce risks.