Why Does a Car Have Unstable Idle Speed?
1 Answers
Reasons for unstable idle speed and shaking in cars include: 1. Severe carbon buildup in the engine. 2. Dirty throttle body or carbon deposits in fuel injectors. 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 readings from the intake pressure sensor. 5. Clogged fuel lines causing inadequate fuel supply. 6. Aging engine components. Solutions for unstable idle speed and shaking: 1. Clean carbon deposits from the engine and idle speed control valve. 2. Clean the fuel system. 3. Replace spark plugs, high-voltage wires, and ignition coils. 4. Clean the air filter and throttle body. 5. Replace aging engine components.