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I think what you are looking at is a distributorless ignition system. All engine controls are routed through the ecm, or engine control module and timing is changed automatically as needed for emmissions and performance.
According to the wiring diagram, there is no inertia switch. There is only a relay switch in a 1991 Isuzu Trooper.
It is located under intake manifold towards the back. It is above the starter.
in the fuel tank
The engine computer on 1991 Isuzu Troopers is mounted on top of the transmission hump, under the center console in the cab of the vehicle. If you have the 4L30E transmission then the transmission computer is mounted next to the driver side (Left) front speaker.
a trooper engine or a rodao engine
The 1991 Ford Probe spark ignition module can be found on the firewall in the engine compartment. The ignition module will be on the drivers side of the firewall.
The firing order for a 1991 Isuzu Trooper 2.8 liter 6-cylinder is 1, 2, 3, 4, 5, 6. The spark plug gap is .045 (in thousandths of an inch).
do you need to take the dash off
The Ignition Control Module is on the top left hand side of the engine under the Ignition Coils.
You can find wiring schematic @www.modifiedlife.com falconspath
Check my isuzuparts.com