1. The car has difficulty starting or fails to start.
When starting the car, it is difficult to start or even fails to start. This means that the car may have problems with more than one spark plug, or multiple spark plugs, and the spark plugs need to be checked and replaced.
2. The car accelerates slowly
Because the electrode gap of the spark plug is too large, it cannot provide stable ignition energy, causing our car to shudder and tremble during acceleration. At this time, the spark plug needs to be replaced.
3. Carbon deposits appear on the spark plug
If the engine burns oil or has incomplete combustion, it will cause black grease on the spark plug. This is carbon deposits, which will cause the spark plug to fail to ignite normally. At this time, the spark plug needs to be replaced.
4. Abnormal spark plug ignition
Remove the spark plug, plug in the cylinder line, or use the motor to start the engine. It is found that the spark plug pole flashes and the blue flame is normal. If the spark is weak, red or the spark is not in the middle of the pole but jumping around, the spark plug also needs to be replaced.
