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How to Determine the Quality of Car Spark Plugs?

1 Answers

VanVivian

07/24/25 5:19pm

Methods to determine the quality of spark plugs: 1. Spark Test: Remove the spark plug and place it on the cylinder block. Use a high-voltage wire to test for sparks. If there is no spark or the spark is weak, it indicates that the spark plug is leaking electricity or not functioning. 2. Color Observation: After removing the spark plug, if the surface appears reddish-brown or rusty, it indicates the spark plug is normal. If there is an oily residue, it suggests the spark plug gap is misaligned, there is excessive fuel supply, or the high-voltage wire is short-circuited or not working. If the spark plug is severely eroded, with signs like pitting, black streaks, cracks, or electrode melting, it means the spark plug is damaged and must be replaced immediately. 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, and reduced power. The most significant problem is difficulty in ignition, affecting the normal operation of the vehicle. Severe erosion of the spark plug, including pitting, damage, or melting of the electrode, indicates that the spark plug is ruined and should be replaced.

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What does AMT model mean?

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