I seem to recall somthing from my Pajero driving days about the diesels having problems with glow plugs.
From memory (a bit vague as mine was a V6) they had a habit of the tip of the glowplug dropping off into the cylinder, and making a bit of a mess as it bounced around
If you need more info, have a look on the Pajero Owners Club (
www.pocuk.com) forum, it is a long while since I was on there, but they were a friendly bunch !