What Causes Car Shaking at Low Speeds?
2 Answers
The reasons for car shaking at low speeds are as follows: 1. Dirty throttle or excessive carbon deposits on the fuel injector: After the car starts, gasoline adsorbed on the carbon deposits is sucked into the cylinder by the engine's vacuum suction force, enriching the air-fuel mixture. The combustible mixture in the engine becomes alternately lean and rich, causing idle shaking after a cold start. Solution: Clean the fuel system and check if the idle control valve has carbon deposits that need cleaning. 2. Ignition system issues: Inspect the condition of the spark plugs, high-voltage wires, and ignition coils. Poor ignition system performance or inadequate spark plug firing can also lead to such symptoms. 3. Unstable fuel pressure: It is recommended to visit a 4S shop to check the fuel supply pressure and the intake pressure sensor. Abnormal fuel pump supply pressure or incorrect readings and poor performance of the intake pressure sensor can cause body shaking.
I have extensive driving experience and often encounter low-speed shaking issues. The car shakes severely at low speeds, especially during startup or in traffic jams. Possible causes include excessive engine carbon buildup, which clogs the intake and leads to incomplete combustion; aging spark plugs failing to ignite; or faulty ignition coils causing misfires. Worn shock absorbers in the suspension system can also create instability, and unbalanced wheels add to the problem. Transmission issues like clutch slippage or degraded oil are common in low gears. It's recommended to first check and replace the spark plugs, clean the throttle body carbon deposits, and test tire pressure. Regular maintenance can prevent these issues—don't delay, as it may damage the car.
