12-22-2020, 03:14 AM
Ok I posted two pictures in the J18 gallery of the plug. Also a compression test is a good idea but tricky considering the location of the spark plugs. basically centerline of head and about 4.5" down. My best guess is either a stuck,bad valve or injector failure. I suspect the injector for two reasons. one when I removed the plug it was completely torched, and because it was dry. I have experienced spark failure before and when I pulled the plug it was wet. In that case it I had to replace the boot and the 2 pin connector. Please look at the photos and tell me what you think.