What Causes the Car to Shake When Accelerating Hard?
2 Answers
Car shaking when accelerating hard is caused by: poor combustion, which may be due to low fuel pressure, poor ignition leading to incomplete combustion, or insufficient cylinder pressure resulting in lack of power. The solution is to clean the throttle body and regularly inspect the spark plugs, replacing them when necessary. It is recommended to clean the throttle body every 20,000 to 40,000 kilometers. If the driving environment is harsh, the cleaning interval should be shortened. However, the throttle body should not be over-cleaned, as excessive cleaning can lead to premature failure. Frequent cleaning can gradually remove the special coating inside the throttle body chamber. Without this coating, the chamber becomes more prone to oil buildup, creating a vicious cycle that ultimately leads to failure.
I've been driving for over 30 years and experienced this kind of throttle vibration several times. The most common cause is ignition system issues, like worn-out spark plugs or leaking ignition coils leading to cylinder misfires. Fuel system problems also account for a large proportion, such as clogged fuel injectors or insufficient fuel pump pressure causing unstable fuel supply during acceleration. For the air system, a dirty air filter or vacuum hose leaks can affect air intake and the air-fuel mixture ratio. Transmission slippage is common in manual transmission vehicles, where the clutch disc wears out quickly and slips. I'm used to checking the spark plugs myself. If replacing them doesn't solve the problem, I immediately go to a professional repair shop. Safe driving is the most important thing—don't wait for small issues to become big troubles. DIY can save money, but complex problems require professionals.
