Can a Spark Plug with Cracked Ceramic Still Be Used?

[StKhloe]

Spark plugs with cracked ceramic cannot be used and should be replaced immediately. The spark plug is a crucial component of the gasoline engine's ignition system, introducing high-voltage electricity into the combustion chamber to create a spark across the electrode gap, igniting the combustible mixture in the cylinder. Common spark plug faults include: 1. Spark plug leakage; 2. Black deposits on the electrode; 3. Fractured insulator tip; 4. Oil fouling on the spark plug; 5. Spark plug erosion; 6. Excessive spark plug gap. The steps for replacing a spark plug are: 1. Remove the spark plug cap when the engine is cold; 2. Unscrew the old spark plug counterclockwise; 3. Screw in the new spark plug clockwise; 4. Reattach the spark plug cap; 5. After replacement, verify everything is correct and test the ignition.

[GenesisFitz]

I noticed the ceramic part of the spark plug cracked while driving, and it must not be used. The ceramic mainly insulates the high-voltage current; once cracked, it will leak electricity, causing unstable ignition, and the engine may stall or shake. If you continue to use it, the abnormal spark may ignite gasoline improperly, increasing the risk of knocking or even fire. I once ignored it, and my car broke down halfway, costing more to tow and repair. Safety first—go to the repair shop immediately to replace it, don’t risk it to save money. Regularly checking spark plugs is a good habit; usually, they should be inspected every 20,000 kilometers, especially for older cars, which are more prone to such issues. Remember, don’t drive with hidden dangers on the road.

[LaRyan]

If the spark plug ceramic is cracked, stop using it immediately, otherwise the car's performance will significantly drop. The cracked ceramic causes leakage between electrodes, weakening the ignition strength and leading to incomplete fuel combustion. This increases fuel consumption, costing more money per tank, and reduces power, making it difficult to climb hills. I once tested it—cracked spark plugs cause abnormal temperature rises during engine operation, which can damage the cylinder over time, leading to repair costs of thousands of dollars. It's recommended to replace them right away; spark plugs aren't expensive, just a hundred bucks for a new one. When inspecting, remove the high-voltage wire, carefully disassemble, and ensure the new spark plug is tightened to the correct torque to avoid road issues affecting the driving experience.

[StDiana]

I just changed the spark plugs and noticed the ceramic was cracked, so I decided to replace them immediately. Cracked ones can't be used because they disrupt ignition, making the engine hard to start or causing sudden stalling. Checking it myself is simple: remove the spark plug and inspect the white ceramic part for cracks or chips. If there are any, don't wait—just buy the same model and replace it, which takes about a minute or two. There are tutorials online showing the steps; remember to disconnect the battery before working on it for safety. Long-term neglect can lead to increased carbon buildup in the engine, making cleanup more troublesome. As a DIY enthusiast sharing this experience, don't lose big for small gains.