What Causes Severe Vibration During Car Startup?
2 Answers
Severe vibration during car startup can be attributed to the following reasons: 1. Poor fuel quality; 2. Carbon buildup on engine valves and intake pipes; 3. Poor lubrication or damage to spark plugs; 4. Insufficient engine power; 5. Aging rubber components in engine mounts and transmission mounts; 6. Aging or leakage in high-voltage wires. Solutions for severe vibration during car startup include: 1. Choosing gasoline with guaranteed quality; 2. Cleaning carbon deposits from the engine; 3. Lubricating the spark plugs; 4. Inspecting components or mount rubber for aging; 5. Checking the condition of high-voltage wires and ignition coils; 6. Diagnosing potential electrical circuit faults.
The car shakes violently when starting, and it sounds like the engine is unstable, which is worrying. The spark plugs might be the issue; after several years of use, carbon buildup can cause uneven ignition force, making the entire engine shake. Fuel system inefficiency is another common cause—clogged fuel pumps or filters can prevent proper fuel delivery, leading to incomplete combustion and shaking. Don’t overlook the engine mounts either; worn or loose mounts lose their support, transferring vibrations to the car body. In cold temperatures, thick engine oil viscosity can also make starting shaky. I recommend checking the spark plugs and fuel pressure as soon as possible. Regular maintenance can prevent this issue from escalating into major failures, affecting driving safety or increasing repair costs. In short, once noticed, get it diagnosed at a professional shop promptly—minor fixes can resolve it.
