Eugene wrote:Compression test, dry then wet. I don't think that a warped head is the problem with #3 cylinder. More than likely worn or stuck rings since that cylinder is pumping oil - fouling the spark plug.Jason_Coffey wrote:If there is a way to test for a warped head I would definitely try it.
Just go ahead with the SeaFoam treatment, work the engine. It may take a while for the rings to free up - maybe never. In the mean time, you will probably continue to foul the spark plug. Next time you have to replace the #3 plug, go with a hotter plug and open the gap up a bit.
While you are adding Seafoam to the oil also add it to the gas. Then work it.