When these rings become worn, broken, or improperly seated, they lose their sealing ability. Drivers often notice a rough idle, excessive smoking from the exhaust, and a distinct smell of unburned fuel.
Identifying Oil Fouling Symptoms in Your Spark Plugs
Distinguishing Oil Fouling from Other Types It is essential to differentiate oil fouling from carbon or fuel fouling. Additionally, a "wet compression test" provides further clarity.
Identifying the Symptoms and Mechanism of Failure The most immediate symptom of this problem is a sudden loss of power or the engine failing to start altogether. Summary of Key Indicators and Actions.
How to Spot Oil Fouling: Key Symptoms for Identification
If compression rises slightly when a small amount of oil is added to the cylinder, it confirms that the rings are sealing intermittently and are the source of the oil reaching the plug. This condition coats the center and ground electrodes with a thick, conductive oil residue, disrupting the spark necessary for ignition and leading to significant performance issues if left unaddressed.
More About Oil fouled spark plug
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