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What Are the Causes of Car Idle Shaking?

1 Answers

McLouis

07/30/25 4:19am

There are 6 main causes of car idle shaking: 1. Intake system failure: Excessive carbon buildup in throttle body/intake manifold, clogged air filter element, intake pipe/EGR valve leakage, or faulty intake pressure sensor. 2. Fuel system failure: Fuel supply pressure issues or injector malfunction. 3. Ignition system failure: Spark plug misfiring/weak spark energy, faulty ignition module/coil, or sensor/ignition circuit problems. 4. Electronic control system failure: Damaged internal circuits or poor contacts. 5. Mechanical structure failure: Piston ring damage/loss of elasticity, carbon deposits in ring grooves/cylinders, bent connecting rod, or incorrect timing belt installation. 6. Other causes: Increased engine load from AC/automatic transmission, clogged catalytic converter, or imbalance in rotating components like crankshaft/flywheel.

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What are the precautions for replacing parts?

The precautions for replacing parts are: 1. Refer to the maintenance manual when replacing parts; 2. Pay attention to the specifications of the screws and the force used, and tighten the screws after proper assembly; 3. Pay attention to the assembly sequence and cleanliness; 4. Check if the part's trademark and identification are complete, if the outer packaging is intact, and if the printing on the packaging box is clear; 5. Pay attention to the quality of the parts, carefully inspect for rust spots, cracks, and deformation defects before use; 6. When replacing gears, double-row sleeve roller chains in the transmission box, and the driving and driven sprockets, they should be replaced in pairs; 7. When replacing the cylinder liner, the piston and piston rings should also be replaced simultaneously.

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