What Causes Car Idle Shaking?
2 Answers
Car idle shaking is caused by: 1. Severe engine carbon buildup; 2. Dirty throttle body or excessive injector carbon deposits; 3. Faulty spark plugs, high-voltage wires, or ignition coils leading to poor ignition system performance; 4. Unstable fuel pressure, insufficient fuel pump supply pressure, or incorrect intake pressure sensor readings; 5. Fuel line blockage causing insufficient fuel supply; 6. Aging engine components. Solutions for car idle shaking: 1. Clean engine and idle motor carbon deposits; 2. Clean fuel lines; 3. Replace spark plugs, high-voltage wires, and ignition coils; 4. Clean air filter and throttle body; 5. Replace aging engine components.
I've been driving for over a decade, and idle shaking is quite common. It's mainly caused by thick carbon deposits inside the engine affecting smooth combustion, making the car unsteady when parked. If the spark plugs are worn out and the ignition is unstable, it can also cause this. Insufficient fuel supply, such as clogged fuel injectors, can lead to shaking as well. If left unattended for a long time, carbon deposits can worsen engine wear, affect performance, and even reduce lifespan. I recommend regular carbon cleaning and checking the air filter and spark plugs every six months to prevent shaking and ensure safer and smoother driving. By the way, a dirty air filter causing poor airflow can also easily lead to shaking, and simply replacing it isn't too troublesome.
