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did you reprogram the New ECU to the Truck ? if not there is your Problem , if crank or cam sensors fail to operate ? this truck will not crank at all , the Distributor in this year Model truck is old school mechanical type and they are the safest in market . they have internal mechanical driven pulse ignition modules if these modules fail ? you will have crank but no spark without ground short . you must Have either unprogrammed ECU ? or a wiring short in main Harness ( between power and ground ) to cause ECU to fry , Ignition non these trucks are also direct power supply with 40 Amp .
do you have the complete service Manual for it ? if not here is a gift for you : 1999 Nisan Frontier, KA 24 class http://pdf.textfiles.com/manuals/AUTOMOBILE/NISSAN/frontier/1999-KA/ec.pdf
You seem to of covered most bases but are all of the things (air/ gas/ spark getting to the engine at the right time in the right amounts. FUEL PRESSURE? FUEL INJECTORS FIRING AT THE RIGHT TIME? SPARKING ? AT THE RIGHT TIME? PROPER AIR INTAKE (EMISSIONS?) You have may have to look into cam & crank sensors.
i think your fuel pump is in the tank .
no matter where it is you should hear it pumping initially.
if you know what your doing disconnect it an see that it pumps.
other wise youll put you eye out
Unless the head gasket is leaking, I would think you are looking for something electrical that is not working when hot, or a fuel problem. Do you know if you have spark and fuel pressure when it will not start ?
Take one of the spark plugs out and let us know what it looks like. Dry and light grayish tan means you have spark but fuel supply problems. Wet spark plug that smells like gas means it is more of a spark issue.
P0340....Camshaft Position Sensor 'A' Circuit (Bank 1 or Single Sensor) P0325....Knock Sensor 1 Circuit (Bank 1 or Single Sensor)if you have no spark it your cam sensor
when you check for spark check all cylinders u can use a regular spark plug and wire ground the plug end set the gap a little higher than veh calls for then yuoll know if it can have enogh to run all cylinders if you find only 2-3 firing thats still considerd no spark. hope this helps THUNDERBOLTZ
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