So last weekend was in the process of swapping all eight glow plugs. My truck was starting just fine but a little more white smoke than I liked. So when I got to the last glow plugs...it was hard turning all the way to the top, at least what I thought was the top. Once I got to the point that I thought all the treads were free I tried to remove the plug and all it did was wiggle and wouldn't budge. Is this a swollen glow plug or are the threads messed up. This glow plug right from the start had the internal electrode just hanging on the pigtail separated from the threaded portion of the glow plug but sitting inside. All the other glow plugs remove very easily with to evidence of swelling. I tried and tried to remove this last glowplug with no luck so I ended up just retightening back into the hole. My truck starts much easier with the seven new glow plugs but I would really like to get the last one also. Any ideas? Is it the threads or a swollen plug? Will a slide hammer remove it the rest of the way?