Spark Plug Symptoms Chart
Spark Plug Symptoms Chart. If you see melted electrodes, blisters on the insulator, or any white deposits it is a sign of a burnt spark plug. Rough Idle A bad spark plug may cause your engine to sound rough while idling.
When oil leaks into the combustion chamber, the tip of the plugs gets contaminated, leading to failure. There will be small jerks and vibrations along with it. Plug insulator firing tip looks yellow or green/yellow and shiny.
If it's too cold, the plug will get fouled and stop firing.
Cracked or broken core nose Detonation or wrong way of setting electrode gap.
Check ignition timing and plug temperature value. Engine misfiring is the most common symptom of a bad spark plug. Mainly your engine misfires, your car battles to start, you'll notice excessive exhaust smoke from the vehicle's exhaust tail pipe mainly due to unburnt/ incorrectly ignited fuel in the piston / sleeve area.
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Arleen Butler
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