How to test cam sensor on mitsubshi montero spot 98 3,0L.

Check the cam position sensor and the crankshaft position sensor for loose connections or possibly a bad sensor. Run a diagnostic test to give you a better idea of which parts are faulty.

The jack is or should be located in one of the panels in the rear of the delica in the boot area,think its the right hand side

Difficult question to answer directly. There's a pressure regulator on the end of the fuel rail that's set to around 35 psi. The fuel pump can deliver more than this of course, but the regulator is there to return excess pressure to the tank. Perhaps your problem is the fuel pump or the MPI relay which is usually behind the center console.

You have not indicated that you have even had the basic test done which is a OBD2 fault code test, please do this test.

have it shut off by your local auto store and see if comes back on.if not problem solved

When you say won't start... will it not turn over or will it turn over but not start. If it is cranking but no start I'd say the ECU is beginning to fail (very common in early 90's Mitsubishi's) If need be there is a way you can check the ECU for codes with a standard analog multimeter. Please let me know.

Thanks,
Tom

Try flushing the radiator and see it that helps. If not try replacing the vented cap on the radiator

The O2 sensor is mounted to the exhaust; you'll need to get under the truck (jack-stand please) to locate. If it sits where a 89-92 sits it will be in the exhaust under the passenger side. Follow the wiring, on most it carries over the transmission to a wiring block under the driver's sie of the truck (again this is all under the truck) As for the low idle I do not believe there is anything to be change. If the idle is low it is due to other conditions... injectors, sensor, low compression, timing or such.
I hope this may have helped,
Tom

difficult one could be a multitude of problems from a supply problem to the ECU or the factory immobiliser has cut in ...have you check the knock sensor ?? dont know where it is on theis model but its like a switch that shuts everything down in a accident

my nissan did that and i replaced the crank sensor and seemed to help thr problem.but that was nissan.fix the cheapest first if not sure