Originally Posted by bill buttermore
I read somewhere if you disconnect the wire at the coil and hold onto the plug wire connector leaving the plug attached at the other end, you won't get zapped 'cause you don't provide as good a path ground as the wire in your hand. I have tried this with my VW and it does seem to protect you from getting zapped. You can bring the coil end of the wire close to the coil tower and watch the spark jump without harm. What I don't know about our waste spark ignition system is if disconnecting a wire when running can hurt anything? Maybe a smart electrical guy will chime in to help.
You know, I'm not entirely sure.
My preffered method for checking is either to get one of the inline checking lights, or to use a spare spark plug wire and plug - just move the plug wire back and forth between different coil packs with a plug in the end, hold the plug to the upper radiator support, and see what you get.
Any check engine lights present?