I have a 94' Walker with the 3 cylinder diesel. Everything is fine except that I now have to operate the glow plugs for about 45+ seconds on a cold start. That is only when it is started the first time each day. After that it will start fine all day without the glow plugs (even after sitting for a couple of hours). I'm starting to think that maybe one or more of the plugs is not working. Has anyone any experince with how to check these? And how about changing them? I also have a Ford PSD and have heard horror stories about these things coming apart in the cylinders when trying to remove them. Thanks in advance. Cleve.