Where is crankshaft sensor 93 3.5 v6 paj??? and help

[Shortpaj]

hi
So today i had my ecu looked at and all is fine.
the guy who looked at it suggested it could be my crankshaft sensor, problem is i have no idea where this is
could someone please point me in the direction where this is please

What is happening is when trying to start it wont fire and will backfire it will turn over getting fuel etc but doesnt fire, leading up to this i was driving through a water never stationary and nothing to deep (also have snorkel) then parked up for awhile and started of again and it stalled about 100m from where i parked up and wouldnt start again, after a long tow home pulled apart and noticed crank had moved about 90 degreees prior to all this happening i had replaced water pump and cambelt and a few tensioners etc, please help i am all out of ideas.

Truck is a 1993 3.5 v6 swb pajero

Thanks
Chris

[nicinnz]

Crank sensor is behind timing covers behind the front crankshaft pulley, there is a plate with bits cut out of it which is called a chopper plate, I have seen a few crank sensors fail due to the crank pulley coming loose, generally after some one has had the cam belt done, the chopper plate mulches the crank sensor, you can see the sensor in below pic, this motor is a front wheel drive engine but is similar set up to the 6G74 in the Pajero
,