Hidden danger of not replacing spark plugs in time / for a long time

In the early stage of not replacing in time, you will feel weak acceleration, difficult starting and fuel consumption.
However, in serious cases, the electrode may break and damage the engine cylinder and piston, or the incompletely burned fuel may enter the exhaust system and damage the three-way catalyst.
If the spark plug is not replaced for a long time, it is easy to cause accelerated electrode wear, increased electrode gap, unstable ignition, formation of carbon deposits and other deposits or partial melting,