What are the reasons for severe engine shaking in a car?

[MadisonMarie]

Car engine shaking can be caused by the following reasons: 1. Dirty air filter. The air filter is designed to protect the engine and reduce wear. If not replaced in time, it can lead to insufficient air intake, causing low idle speed and engine shaking. 2. Spark plugs have a limited lifespan. Generally, after 30,000 to 40,000 kilometers, the ignition efficiency of spark plugs significantly decreases, affecting ignition. 3. Abnormal water temperature. The engine operates within a normal temperature range. If the water temperature rises, it can cause early ignition timing, changes in the air-fuel mixture, thinning of engine oil viscosity, and reduced lubrication performance.

[RyanRose]

Oh, I've experienced severe engine shaking before. It happened while driving on the highway, and the car was rocking like a cradle. There could be several possible causes. First, worn-out spark plugs or damaged ignition coils can lead to incomplete combustion, making the engine run unevenly. Another issue could be with the mass airflow sensor, which inaccurately controls air intake. Fuel system problems like clogged fuel injectors or a dirty fuel filter can also cause uneven fuel supply. Damaged engine mounts can make the engine unstable, transmitting vibrations to the cabin. Additionally, cylinder imbalance, such as a misfire in one cylinder, might be the culprit. I later took it to a repair shop, and it turned out both the spark plugs and ignition coils needed replacement. I recommend not ignoring engine shaking—address it promptly to prevent small issues from becoming major problems.

[DiAlex]

Last time my car's engine was shaking so violently it almost fell apart. I thought it over myself and figured it might be a few common issues: the spark plugs were old and needed replacement, especially with high mileage; faulty ignition coils causing rough starts; a clogged air filter affecting air intake; insufficient fuel pressure, like a broken fuel pump or blocked fuel line; broken engine mounts causing body vibrations; or an idle speed control motor issue making RPM unstable. I asked a car-savvy friend to help check, and we found it was a fuel system problem. Remember to do regular maintenance, like changing spark plugs and cleaning the intake system, to reduce such troubles.

[JordanAnn]

Severe engine shaking is really annoying; I once encountered it while driving in the city. The main causes to check are the ignition system: spark plug erosion or faulty coils; the fuel system: clogged injectors or a malfunctioning fuel pump; the air system: faulty mass airflow sensor or vacuum leaks; and the mechanical parts: damaged engine mounts or cylinder misfires. A quick check of the spark plugs can reveal ignition issues if they appear blackened. Head to a repair shop for diagnosis immediately to avoid further engine damage.

[DeKarter]

When I encounter severe engine shaking, my first concern is safety. Possible causes include worn spark plugs causing poor ignition, faulty air flow meters leading to inaccurate air intake, unstable fuel supply such as dirty fuel injectors, loose engine mounts resulting in poor fixation, or cylinder misfires creating imbalance. I recommend first pulling over to check spark plugs and fuses. If simple troubleshooting doesn't work, seek professional help. For daily maintenance, using quality fuel and regularly replacing air filters can prevent such issues.

[Roger]

I noticed that when the engine shakes severely, it's usually a multi-system issue: in the ignition system, spark plugs or coils may be damaged; in the fuel system, injectors could be clogged or the fuel pump pressure might be insufficient; in the intake system, the air flow meter could be inaccurate or there might be a vacuum leak; mechanical issues like broken engine mounts or cylinder imbalance could also be the cause. It's best to use a diagnostic tool to check for trouble codes and confirm the root cause. My experience is that regular maintenance of spark plugs and fuel lines can help avoid this problem.