What Are the Symptoms of Bad Spark Plugs in a Toyota Hilux?

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What Are the Symptoms of Bad Spark Plugs in a Toyota Hilux?

A rough idle, sluggish acceleration, and misfiring are common signs of worn-out spark plugs. Have you experienced any of these issues with your Hilux?

Sirat Ul Jinan asked on 11 Feb 2025 16:57:51 pm

1 Answer

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Car Mechanic Expert - on 11 Feb 2025 17:04:15 pm

🚗 Signs of Worn o r Failing Spark Plugs:

🔴 1. Rough Idle – The engine vibrates excessively when idle.
🔴 2. Sluggish Acceleration – Lack of power when pressing the throttle.
🔴 3. Engine Misfires – Intermittent hesitation o r jerking while driving.
🔴 4. Hard Starting – Difficulty starting the engine, especially in the morning.
🔴 5. Poor Fuel Economy – More fuel consumption due to incomplete combustion.
🔴 6. Check Engine Light CEL On – A misfire can trigger error codes P0300-P0310.
🔴 7. Black o r Sooty Exhaust Smoke – Unburned fuel causing excess carbon buildup.

📌 Solution: If you notice these issues, inspect and replace the spark plugs if necessary.