remove intake manifold.
exaust gases
It's underneathe the intake manifold, so yes it has to come off first. Not very fun.
Take off the cylinder head and make life easier.
Under the water neck, where the upper radiator hose to connected to the intake manifold on top of the engine.
on the exhaust manifold.
How do you change the transmission fluid on a 2001 4x4 Isuzu trooper
I found it on 91 V6 under air cleaner on front of the intake manifold. look around the upper radiator hose
Remove Camshaft fro isuzu trooper 1996
Its under the intake
Hey There: What year of trooper do you have????
Under the intake mannifold (you have to remove it to get to it).
http://isuzufaq.ibctech.ca/#faq5