What Causes Engine Shaking in Ford Focus?
2 Answers
Ford Focus engine shaking may be caused by: 1. Carbon buildup in the throttle body; 2. Abnormal water temperature; 3. Spark plug issues; 4. Clogged fuel injectors; 5. Low cylinder pressure; 6. Open circuit in high-voltage wires; 7. Dirty air filter. An engine is a machine that converts other forms of energy into mechanical energy, invented in the UK. It can refer to either the power generation device or the entire machine including the power unit. The Ford Focus is a Class A family sedan. As a compact car under the Ford brand, it enhances Ford's global brand position with its excellent chassis and handling. The vehicle features a large sunroof, one-button start, TPMS tire pressure monitoring, parking radar, and a leather-wrapped steering wheel.
My Ford Focus also had a shaking issue before, with the steering wheel vibrating at red lights. First, I checked the ignition system and found one spark plug had incorrect gap spacing. After replacing all four spark plugs, it improved significantly. However, slight shaking returned after a few days. A veteran mechanic diagnosed it as aging ignition coils, with one coil providing unstable power to a cylinder. After replacing the coils, the engine immediately ran smoothly. If shaking persists, he suggested checking throttle valve carbon buildup – I clean mine every 20,000 km with noticeable results. Also inspect engine mount rubber cushions for aging cracks; mine needed replacement after eight years when hardened rubber caused poor vibration damping, making the entire driver's seat tremble. As last resort, examine the fuel system – clogged injectors or overdue fuel filter replacement can also cause shaking.
