Originally Posted by jpalessi

nope. plug go bad all the time and still glow. I see this happen all the time. OR here is one better! I bet you didnt know your glow plug gets its heat range from the initial glow of your glow starter. Meaning your plug runs off the initial glow it gets from your starter, SO guess what happens if your starter is almost dead? weak initial glow, resulting in what seems like a super cold plug..


Just because you plug glows in the starter in your hand, does not mean its still good.