What Causes Spark Plug Failure in a Toyota Hilux?

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What Causes Spark Plug Failure in a Toyota Hilux?

Spark plugs can fail due to carbon buildup, oil contamination, o r extreme heat. What was the main cause of spark plug failure in your Hilux?

Sirat Ul Jinan asked on 11 Feb 2025 17:00:25 pm

1 Answer

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Car Mechanic Expert - on 11 Feb 2025 17:04:57 pm

⚠️ Common Causes of Spark Plug Failure:

🔴 1. Carbon Buildup – Black deposits due to excessive idling, rich fuel mixture, o r poor combustion.
🔴 2. Oil Contamination – Worn piston rings o r valve seals can cause oil fouling.
🔴 3. Overheating – Running too hot can cause the electrode to burn o r melt.
🔴 4. Incorrect Gap – Too wide o r too narrow a gap can cause misfires.
🔴 5. Poor Quality Fuel – Low-octane o r contaminated fuel leads to deposits on spark plugs.

📌 Prevention: Use high-quality fuel, perform regular maintenance, and avoid excessive idling.