Why does the engine shake and the car not move when stepping on the accelerator?

[AliceMarie]

The reasons for the engine shaking and the car not moving when stepping on the accelerator are as follows: Engine misfire: Engine misfire mainly refers to one or more cylinders of the engine not working properly. It is usually manifested as intermittent exhaust gas flow and severe shaking of the exhaust pipe, with noticeable engine vibration, sometimes accompanied by a sputtering sound. This is mostly related to ignition coil failure. Engine mount aging or loosening: Engine mounts are rubber blocks placed between the engine and the frame. Their function is to reduce vibration and buffer the engine's operation and to secure the engine. Once these mounts age or loosen, the engine's vibration will become unusually severe. Replacing the engine mounts can significantly reduce this effect. Carbon buildup issue: Cars inevitably face carbon buildup problems, including carbon deposits in the cylinders, throttle body, spark plugs, and intake system. When there is excessive carbon buildup inside the engine, the ignition energy, intake efficiency, and air-fuel mixture ratio will be affected, leading to unstable power output and shaking during idling and acceleration. It is recommended to have the engine cleaned at a 4S shop. Fuel system failure: Adding incompatible fuel grades can cause a decrease in the car's output power and reduced performance. Alternatively, if the fuel tank cap vent is blocked, or the fuel tank switch, fuel filter, or the fuel line between the tank and the carburetor are partially blocked, the required fuel supply cannot be met, resulting in a lean mixture and engine shaking. It is recommended to use the fuel grade specified by the manufacturer and perform regular maintenance.

[VonDelilah]

I've been driving for many years, and it's not uncommon to encounter issues like engine shaking and lack of power when stepping on the accelerator. The most common cause is problems with the ignition system, such as faulty spark plugs or ignition coils, which can lead to a cylinder misfiring, causing severe engine shaking and reduced power. On the fuel side, clogged fuel injectors or an aging fuel pump can result in insufficient fuel supply, making the engine feel weak even when the accelerator is pressed. Sometimes, a dirty mass airflow sensor or throttle body with excessive carbon buildup can restrict airflow, affecting the combustion of the air-fuel mixture. Don't forget to check the clutch—if the clutch disc in a manual transmission car is worn out, it might slip, preventing power from reaching the wheels. Don't delay addressing such issues; take your car to a reliable repair shop as soon as possible. If the shaking is severe while driving, pull over to prevent accidents. Regular maintenance, including periodic spark plug replacement and fuel system cleaning, can save you a lot of trouble.

[VanDonovan]

Modern vehicles are highly electronic, and issues like engine shaking and sluggish acceleration may be related to sensors or control modules. A faulty oxygen sensor can cause the computer to misjudge the air-fuel ratio, leading to incomplete combustion and shaking. Errors in the crankshaft position sensor can affect ignition timing, resulting in unstable power output. If the ECU software has bugs or is interfered with, it can also disrupt throttle response. It's recommended to first use an OBD scanner to read trouble codes for quick problem identification, which is far better than blind repairs. Also, check for poor fuel quality or clogged filters to ensure smooth fuel flow. During daily driving, always use high-quality gasoline and avoid full-load downhill driving, which can expose weaknesses. If simple checks don't resolve the issue, don't hesitate to seek professional diagnostics.

[McCarmen]

Encountering engine shaking and poor acceleration? Don't panic, check step by step. First inspect if spark plugs and high-voltage wires are igniting properly; test fuel pump pressure and check if the filter is clogged; a dirty air filter can also restrict airflow causing power loss. Then examine the throttle position and idle control valve - carbon buildup is a common culprit. For manual transmissions, suspect clutch slippage by testing pedal feel. Use a multimeter to check fuses and relays for continuity - some time investment can yield preliminary diagnosis. If unsuccessful, visit a workshop for professional diagnostic equipment to read data streams, addressing issues early prevents worsening. Regular DIY filter changes and throttle body cleaning can prevent such problems.