We found the problem: The turbo blew. The shaft either broke or the bearing went out completely. We installed the turbo from my parts Trooper, which oddly was the turbo which was in this Trooper, so now it has its original turbo, and it is running properly again.
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The old turbo still in the manifold. The fans were loose, making one of the noises I heard; rattle rattle rattle.
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New workshop is really comfortable to work in.

Brian Rodgers
Internet traffic relayed through DIY solar powered WiFi tower.
www.outfitnm.com
1989 Isuzu Pup gasser
2-86 Isuzu Trooper turbo diesels (1 good 1 bad)
Many gallons of biodiesel since 2005