How to Determine the Condition by Spark Plug Color?
1 Answers
The normal color of a spark plug electrode is tan-white. If the electrode is burnt black and covered with carbon deposits, it indicates a malfunction. During inspection, you can connect the spark plug to the cylinder block, touch the central high-voltage wire to the spark plug terminal, then turn on the ignition switch and observe the high-voltage spark jump position. If the spark jumps at the spark plug gap, it means the spark plug is functioning well; otherwise, it needs to be replaced. Below are the spark plug conditions under different circumstances: 1. Normal spark plug: A normal spark plug is light brown. 2. Engine burning oil: Severe carbon deposits on the spark plug indicate that oil has entered the combustion chamber, commonly known as burning oil. Such a vehicle will emit thick blue smoke from the exhaust pipe. 3. Spark plug too wet: The heat value of the spark plug is too low or there is a fault in the electronic control system.