There are ways to identify spark plug working conditions

The working status of the spark plug is normal, which directly affects the dynamics, economy, and purification of the engine. There are five methods for discerning the working conditions of the spark plug.

Touch sensing method. If the engine feels unstable or trembles after starting the vehicle, check for missing cylinders. First, the engine is turned off, and the insulation porcelain of the spark plug is touched by the cylinder by hand. If the temperature is significantly lower, then the cylinder spark plug is not working properly.

Visual inspection method. Check whether the insulator of the spark plug has cracks or breakage, whether the electrode is loose, ablative, whether the center electrode and the porcelain cavity have carbon deposition, grease, etc. Spark plug operating conditions can be judged by these appearance phenomena.

Check the color method. The center electrode of a normal spark plug should be auburn, and the end face of the thread should be iron-colored. Spark plugs are black due to coke deposition. Most of them are caused by poor working of the cylinder, and a cylinder does not work. The spark plugs will be flooded with accumulated oil, ie, "drained cylinders".

Off fire analysis method. This method can also separate high voltage and short circuit methods. When the engine is running at low speed, remove the cylinder high-voltage line to make a fire test. If the engine speed drops, the vehicle shakes, indicating that the cylinder spark plug works well; if the operation does not change significantly, it indicates that the cylinder spark plug is not working properly. This method is not suitable for high-energy ignition vehicles.

Skipping test method. Put the removed spark plug on the cylinder head. When high pressure and high temperature are ensured, press the high pressure center line on the upper body nut of the spark plug and start the engine with a starter. If the spark is weak, it means that there is a serious short circuit between the two poles of the spark plug; if the spark is not in the center, it means that the spark plug has too much carbon or grease; if there is a flashover between the porcelain body and the cylinder head, it indicates the leakage of the insulating porcelain.

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