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Set the crank at the zero degrees point on the pointer scale. look at rotor under the dist. cap. (If on number 4 plug tower, turn crank one revolution and back to zero degrees.) If timing has not jumped, rotor will be directly pointing to number one spark plug tower.
I would check for a spark first, but you can pull of the distributor cap and check if the rotor is still turning. If it is not turning, you may have a broken timing chain. If it is turning and there is no spark, it is probably bad spark plug wires, spark plugs, distributor cap, rotor, camshaft position sensor, or crankshaft position sensor.
If the truck was running prior to changing the plugs and rotor, there's not much that could have gone wrong. You didn't mention changing the distributor cap. That usually goes hand in hand with changing the rotor. Make sure the rotor wasn't installed 180 degrees off. Double check the spark plug wires to make sure they are on the right plug. If that all checks out, then you need to pull a spark plug and check for spark and fuel at the cylinder.
Pull a plug wire and have some one crank the engine as you observe the end of the plug wire for spark DONT HOLD IT IN YOUR HAND WILL ITS CRANKING lay it next to metal if there is spark you will notice it arcing against the metal they do make a tester to do this but if you dont have one laying it next to metal will do. If you have no spark could be your crank sensor has gone bad if you have spark and it still doesnt start could be your timing has jumped.Have the codes extracted and see what it tells you good luck to you.
So you threw parts at it. No harm intended. Should have started with the adding gas part first. You know the filter is new and it does run! Are the fuel pump amps correct,pump mech bound,no fuel volume, pressure regulator work correctly? Does the pump run in start mode or time out? Now the harder stuff. What does the spark and timing look like,What is the computer seeing and then what command is it sending?
take cap off have someone crank and see if rotor is turning if it is not check to see if rotor is stripped or if shaft is not turning pull distributor out of block and check cam gear
I have a 92 Nissan congrats they are awesome cars. Me and my friend changed the rotor and cap along with the spark plugs on mine. If you lost the wire pattern I would recommend going to auto store and looking it up in the nissan car manual.
Good Luck
Proteus
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