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Causes of Intermittent Engine Shaking

1 Answers

EzraFitz

07/30/25 5:22am

Engine intermittent shaking may be caused by the following reasons: 1. Engine intake pipe leakage: The intake system contains numerous intake manifolds or valves. If gas leaks into other components, it may cause the air-fuel mixture concentration in the intake manifold to become excessively high or low, leading to intermittent engine shaking or weak idle performance. 2. Fuel system blockage or malfunction: Blockage in the fuel tank vent hole, fuel tank switch, fuel filter, or fuel lines between the tank and carburetor may prevent the engine from receiving the required fuel supply during idle. This results in a lean air-fuel mixture, reduced power output, and idle shaking. 3. Idle control valve malfunction: The ECU controls the opening of the idle control valve based on signals such as engine speed, temperature, and throttle position to maintain stability. If the valve malfunctions, uneven air distribution occurs, causing fluctuating idle power and vehicle shaking. 4. Engine carbon buildup issues: Carbon deposits, including cylinder carbon, throttle carbon, spark plug carbon, and intake carbon, directly affect engine power output. Excessive carbon buildup reduces ignition energy and intake efficiency, leading to unstable power output, idle shaking, and poor acceleration.

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