How to Determine if a Car's Spark Plugs Need Replacement

[DelOmar]

Methods to determine if a car's spark plugs need replacement include: 1. Increased deposit buildup inside the spark plugs; 2. Electrode melting or burning; 3. Ignition system malfunction; 4. Reduced power and sluggish acceleration; 5. Severe idle vibration; 6. Difficulty starting or sudden engine stalling. The function of spark plugs is to conduct high voltage electricity from the ignition coil into the engine cylinder, generating a spark across the electrode gap to ignite the air-fuel mixture, thereby enabling engine operation. Consequences of damaged spark plugs include: 1. Reduced power output, decreased shunt resistance, unstable engine operation leading to weak throttle response; 2. Significant vehicle vibration during idle; 3. Excessive exhaust emissions and increased fuel consumption.