How to Check if a Car Spark Plug is Good?
1 Answers
How to check if a car spark plug is good: Remove the spark plug and observe its condition based on the following appearance colors. A normal spark plug will have its insulator skirt and electrodes in gray-white, gray-yellow, or light brown. A properly functioning spark plug has a reddish-brown insulator skirt, with an electrode gap between 0.8-0.9mm and no signs of electrode burn. If the spark plug is covered in oil or deposits but is not damaged, it can continue to be used after cleaning off the oil and deposits. If the spark plug is severely damaged, showing signs like blistering at the top, black streaks, cracks, or melted electrodes, the cause of the damage should be identified. After troubleshooting, replace the spark plug with a new one. Additionally, if the spark plug appears black as if smoked, it indicates the wrong heat range was selected or the air-fuel mixture is too rich, with oil creeping up. What are the effects of a bad spark plug: A damaged spark plug can directly cause issues such as leakage in the vehicle's ignition system, increased fuel consumption, reduced power, and most notably, difficulty in ignition, affecting the vehicle's normal operation. Severe spark plug erosion, blistering at the top, damage, or melted and eroded electrodes all indicate that the spark plug is ruined and should be replaced.
