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What are the symptoms of needing to replace spark plugs?

2 Answers

StAllison

07/29/25 4:47am

Symptoms indicating the need to replace spark plugs: The car exhibits difficulties in starting, reduced power, excessive exhaust emissions, and increased fuel consumption; severe damage to the spark plugs, with symptoms such as blistering at the top, black streaks, cracks, or melted electrodes. Methods to determine if a spark plug is damaged: Remove the spark plug and observe its appearance to assess its condition. A normal spark plug has an insulator skirt and electrodes that appear gray-white, gray-yellow, or light brown. A properly functioning spark plug has an insulator skirt that is reddish-brown, with an electrode gap between 0.8-0.9mm and no signs of electrode burning. 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, with symptoms such as 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 that the wrong heat range was selected or that the air-fuel mixture is too rich, with oil creeping up.

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DeArabella

08/12/25 8:27am

When spark plugs are about to fail, the car will show various issues. Last year when I drove an older Civic, the idle was extremely rough, like sitting on a massage chair, and acceleration was sluggish. Then fuel consumption increased—originally, a full tank could cover 500 km, but it dropped to just 450 km. The most annoying part was the difficulty starting—the car would cough for a while before finally firing up. Worn electrodes on old spark plugs lead to weak ignition and misfires, reducing engine efficiency. Standard spark plugs should be replaced every 40,000–80,000 km. Ignoring them increases carbon buildup in the engine, making repairs costlier. Regularly check the spark plug color—if it's charred or shows signs of leakage, replace it to save hassle and money.

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