19
2025
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09
What are the symptoms of a faulty spark plug cap?
Author:
Engine shaking
Difficult to start
A damaged spark plug high-voltage cap can cause the ignition system to malfunction, particularly in cold weather conditions, where the air-fuel mixture has poor volatility. When ignition energy is insufficient, this increases the likelihood of repeated failed starts or even complete inability to start the engine.
Engine抖ing
A damaged high-pressure cap can cause idle instability or inconsistent power delivery during driving, and in severe cases, may lead to vibrations in the steering wheel or seats, compromising driving stability.
Decreased power
Weakened ignition capability leads to incomplete air-fuel mixture combustion, resulting in slower throttle response, reduced top speed, and a noticeable decline in hill-climbing ability.
Increased fuel consumption
Reduced combustion efficiency forces the engine to increase fuel injection, leading to higher fuel consumption. Meanwhile, incompletely burned fuel is expelled through the exhaust pipe, resulting in wasted resources.
Excess exhaust emissions
Directly exhausting incompletely combusted fuel-air mixtures leads to increased black smoke, particulate matter, or unpleasant odors, resulting in failing emission tests.
Suddenly stalls
Partially damaged high-pressure caps may cause the engine to suddenly stall while driving, though restarting the vehicle could temporarily restore normal operation—though repeated failures may still occur afterward.
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