What causes spark plug and coil boot to leak?
What causes spark plug and coil boot to leak? This is usually due to the intake manifold gasket leaking anti-freeze. Also, if the engine was washed... you'll get the same result. In photo 2 You can see what a spark plug and coil boot looks like when oil is leaking on them. This is usually due to valve cover gasket problems. Carbon tracks on the spark plug boot and on the spark plug. Why is my spark plug broken on my Ford 4.6L? The coil, coil boot and spark plug have to be replaced. The Coil-On-Plug's electrical connector is broken....