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Spark Plug Fault Diagnosis

Normal
Symptoms: Brown to greyish-tan colour and slight electrode wear. Correct heat range for engine and operating conditions.

Recommendations: When new spark plugs are installed, replace with plugs of the same heat range.

Worn
Symptoms: Rounded electrodes with a small amount of deposits of the firing end. Normal colour. Causes hard starting in damp or cold weather and poor fuel economy.

Recommendations: Plugs have been left in the engine too long. Replace with new plugs of the same heat range. Follow the recommended maintenance schedule.

Carbon Deposits
Symptoms: Dry sooty deposits indicate a rich mixture or weak ignition. Causes misfiring and hard starting.

Recommendations: Make sure the plug has the correct heat range. Check for a clogged air filter or problem in the fuel system or engine management system. Also check for ignition system problems

Ash Deposits
Symptoms: Light brown deposits encrusted on the side or centre electrodes or both. Derived from oil and/or fuel additives. Excessive amounts may mask the spark, causing misfiring and hesitation during acceleration.

Recommendations: If excessive deposits accumulate over a short time or low mileage,install new valve guide seals to prevent seepage of oil into the combustion chambers. Also try changing petrol brands.

Oil Deposits
Symptoms: Oily coating caused by poor oil control. Oil is leaking past worn valve guides or piston rings into the combustion chamber. Causes hard starting and misfiring.

Recommendations: Correct the mechanical condition with necessary repairs and install new plugs.

Gap Bridging
Symptoms: Combustion deposits lodge between the electrodes. Heavy deposits accumulate and bridge the electrode gap. The plug ceases to fire, resulting in a dead cylinder.

Recommendations: Locate the faulty plug and remove the deposits from between the two.

Too Hot
Symptoms: Blistered, white insulator, eroded electrode and absence of deposits. results in shortened plug life.

Recommendations: Check for the correct plug heat range, over advanced ignition timing, lean fuel mixture, in