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Well as I know little about conversions, not sure if it's a bolt on or not and it really didn't matter to me, but it was the 2.5 originally. As for the original trooper, next time I talk to him I'll ask.


Not a problem, just was wanting to know for future knowledge of possibly wanting to convert a gas S10 or S15 down the road. I know 82-85 S-Series trucks came with the 1.9 Isuzu four cylinder and I can almost bet the 2.2 diesel would bolt in on one of those factory trucks. Now whether it would in a 2.5 truck I'm really not sure. Thanks and let me know what you find out on the 87 Trooper and if the diesel conversion was a bolt-in on your truck. Did you go to isuzupup.com too?