What is the reason for severe shaking when starting the Sail?

[StViolet]

The most common cause of severe shaking when starting the Sail is a dirty throttle body or excessive carbon buildup in the fuel injectors. Below are the relevant explanations: 1. Excessive carbon buildup: When there is too much carbon buildup inside the engine, the gasoline sprayed by the cold-start injector is largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts, making it difficult to start. In this situation, the engine will only start easily once the carbon deposits have absorbed enough gasoline to become saturated. After starting, the gasoline adsorbed on the carbon deposits is then drawn into the cylinders by the engine's vacuum suction to burn, making the air-fuel mixture too rich. The engine's combustible air-fuel mixture alternates between being too lean and too rich, causing idle shaking after a cold start. The lower the temperature, the more fuel is required for a cold start, and the presence of carbon deposits will significantly affect whether the cold start proceeds smoothly. 2. Air-fuel mixture: A too-lean air-fuel mixture during a cold start makes it difficult to start until the carbon deposits absorb enough gasoline to become saturated. After starting, the gasoline adsorbed on the carbon deposits is drawn into the cylinders by the engine's vacuum suction to burn, making the air-fuel mixture too rich. The engine's combustible air-fuel mixture alternates between being too lean and too rich, causing idle shaking after a cold start.

[Josephine]

Severe shaking during Sail start-up is usually related to engine issues. I remember once when I was driving a friend's car, the steering wheel vibrated noticeably during start-up. After checking for a long time, we found it was caused by misfiring due to worn spark plugs. Worn or carbon-fouled spark plugs can make the engine run unevenly, especially noticeable during cold starts. Additionally, clutch slipping is another common cause. Since most Sails are manual transmissions, worn or mismatched clutch plates can cause shaking. There's also the engine mount cushion aging - this component is responsible for vibration damping. Once damaged, vibrations directly transfer to the chassis, particularly noticeable during start-up. I recommend checking the spark plugs as soon as possible to see if they need replacement. If you're doing it yourself, you can remove them to inspect - if they're blackened or cracked, that's a clear sign. Otherwise, the shaking will worsen and fuel consumption will increase.

[AdamLynn]

Severe shaking during startup is most likely caused by ignition system or fuel supply issues. As someone who frequently deals with cars, I would first check if the spark plugs are clean, then test whether the ignition coils are faulty. The Sail engine is particularly sensitive to ignition requirements; misfires can easily cause shaking. Next, check if the fuel injectors are clogged, as poor fuel flow can affect the combustion of the air-fuel mixture. Clutch issues should not be overlooked either. If it's a manual transmission and you feel strong jerking during gear shifts, it’s likely related to the clutch. Alternatively, the engine mounts may have aged or loosened, transmitting vibrations to the cabin. For diagnosis, it’s best to visit a professional shop and use an OBD scanner to check for error codes, which can save time. In daily driving, avoid excessive carbon buildup in the engine, and regularly maintain spark plugs and change the oil to prevent many shaking issues.

[SanKyle]

There are several main reasons for the Sail's shaky start: spark plug issues, clutch wear, or engine mount damage. Dirty or worn-out spark plugs can cause poor ignition, making the engine run unevenly. Clutch slippage is common in manual transmission cars, causing shaking during semi-engagement. Worn engine mounts reduce vibration absorption, transmitting shocks directly to the body. The inspection steps are simple: first check the spark plug color—black means replacement is needed; then see if the clutch pedal travel has increased. Address these promptly to avoid transmission damage and ensure driving safety.

[AndrewAnn]

If the car shakes severely during startup, it's crucial to be cautious of driving safety hazards. Common causes include unbalanced engine vibrations, possibly due to misfiring caused by faulty spark plugs or ignition coils, as the entry-level Sail's engine is particularly sensitive to ignition issues. Clutch system problems are also frequent, where worn half-shafts or stuck input shaft bearings can cause shaking. Failing to repair promptly not only accelerates wear on components but also increases the risk of losing control when starting at intersections, raising accident risks. I recommend prioritizing an inspection of the ignition system to ensure each cylinder is burning properly. Always start gently by lightly pressing the accelerator to avoid sudden acceleration that stresses the drivetrain. If shaking is detected, stop immediately for inspection—ensuring driving safety is the top priority.