Why does the car idle shake and then stall?

1 Answers
Kaden
07/30/25 6:46am
The reasons why the car idles and shakes before stalling: 1. Excessive carbon deposits cause pre-ignition and detonation, shortening the engine's service life and significantly reducing its power and fuel economy; 2. Carbon deposits on the valve and its seat ring working surfaces cause the valve to not close tightly, leading to air leakage, difficulty in starting the engine, lack of power, and other adverse phenomena such as valve burn-out; 3. Carbon deposits and gum formation on the valve guide and valve stem accelerate the wear between the valve stem and valve guide, and may even cause the valve stem to stick or seize in the valve guide, resulting in valve sticking faults; 4. Excessive carbon deposits on the spark plug can cause spark plug leakage, failure to work, engine shaking, and other faults.
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