exaust gases
remove intake manifold.
To clean the intake manifold of an Isuzu Trooper, first, ensure the engine is cool and disconnect the battery. Remove the intake manifold from the engine by loosening the necessary bolts and disconnecting any hoses or electrical connectors. Clean the manifold using a suitable solvent and a soft brush or cloth to remove buildup and carbon deposits, ensuring all passages are clear. Finally, reassemble the manifold, replacing any gaskets as needed, and reconnect the battery.
It's underneathe the intake manifold, so yes it has to come off first. Not very fun.
Under the water neck, where the upper radiator hose to connected to the intake manifold on top of the engine.
Take off the cylinder head and make life easier.
on the exhaust manifold.
On a 2000 Isuzu Trooper, the map sensor, also known as the manifold absolute pressure (MAP) sensor, is typically located on or near the intake manifold. It is usually mounted on the engine's intake manifold or close to it, connected by a vacuum hose. You can identify it by its electrical connector and small size, often resembling a cylinder or rectangular shape. Always consult the vehicle's service manual for the exact location and specifications.
I found it on 91 V6 under air cleaner on front of the intake manifold. look around the upper radiator hose
Its under the intake
The EGR (Exhaust Gas Recirculation) valve on a 1985 Isuzu Trooper is typically located on the engine intake manifold, near the back of the engine. It connects to the exhaust manifold via a metal pipe. To access it, you may need to remove some components such as the air intake or other hoses for better visibility and reach. Always refer to a repair manual for specific details related to your vehicle's configuration.
Under the intake mannifold (you have to remove it to get to it).
http://isuzufaq.ibctech.ca/#faq5