Posts Tagged: ignition coil soaked in oil

Why is the ignition coil soaked in oil?

Understanding the Issue: Ignition Coil Soaked in Oil Coil-on-plug ignition coils sit on top of a spark plug that’s threaded deep inside the cylinder head. A spark plug tube extends from the cylinder heat to the valve cover and a rubber seal prevent oil from leaking down into the spark plug tubes. However, over time the spark plug tube seals fail and allow oil splash to seep into the tube. If you find your ignition coil soaked in oil, the cause is a worn, aged, shrunken spark plug tube seal. … Read More