1. Poor quality Spark plug center electrode material, the central electrode is not a special nickel alloy material made of (internal not embedded copper core), thermal conductivity is not good, very easy to melt, electrode melting may lead to piston, cylinder and other related parts damaged.
2. Poor quality spark plugs insulation material, non-conductive performance (insulation performance) is poor, can not withstand the high voltage ignition, prone to leakage, engine ignition abnormal, not ignition, vehicle jitter and other failures.
3. Poor quality spark plug resistance to electromagnetic interference, spark plugs inside no resistance, can not resist electromagnetic interference, on the contrary will generate electromagnetic interference signal.