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Pull a spark plug, ground it to the metal engine somewhere, keep it plugged into the spark plug wire. disconnect the other spark plug wires so it doesn't start. Turn the car over (try to start it) and see if the one spark plug fires. Do not touch it or hold it while trying this. They use about 30,000 volts. You just confirmed one of the 3 requirements for starting: fuel, compression and spark. If you smell fuel anywhere but the exhaust, don't try this as the spark from the spark plug can ignite fuel or fumes in the engine compartment. If your spark plug fired ok, check to make sure the timing belt did not break. Sometimes you can pry the plastic cover open a bit over the cam gears, or sometimes there is an inspection hole, or you can look into your oil fill hole to see if the cam is turning (as the timing belt turns the cams). I modify everything I have to make it more user friendly. Nothing is perfect but faith and even that can be improved.
I would suspect that your problem is related to a poor joint in the wiring between battery posts, starter solenoid and starter motor. Also the main body and engine earth (ground) leads need checking.
Have a look and identify all of these connections and check or any that are loose.As a guide If they are movable by hand using significant force they are no good.
Next when this has just happened CAUTIOUSLY touch each one in turn checking for heat. If warm or even very hot ( caution again) they are no good. Any that are suspect must be taken apart, thoroughly cleaned using a wire brush to obtain a bright metal appearance on all mating surfaces. Re assemble ensuring each joint is firmly done up. A poor joint will often pass enough current to turn the starter motor, but fail due to heat expansion immediately after.
Check also the starter motor is securely bolted to the engine, don't forget to check the condition of the earth (ground) strap between body and engine or gearbox. As this carries all the power to turn the starter motor.
There are several ways to add more ground wires. If your battery ground cable is clean and tight, you can use 10 or 12 gauge black automotive wire and terminal ends to make your own grounds. Ground from the negative battery terminal to the engine. Ground from the negative terminal to the metal firewall behind the engine. Ground from the negative terminal to the chassis.
The first thing i would do is try turning over the engine by hand making sure the engine itself is not seized. if it turns over by hand check to make sure your getting 12 volts down at the starter. sometimes starter cable gets corroded causing slow or even no start. if thats good, check to make sure you have a good ground from your batteries to your engine. your starter gets its ground from its case which is mounted to the engine. if the engine isnt grounded you wont have a complete circuit.
This injector set-up needs a specific fuel pressure supplied to the fuel rail to even start, much less run properly. The fuel pump is immersed in fuel inside the gas tank to keep it cool and not burn up. Running the fuel level low causes more heat in the pump and interuptions in proper fuel pressure. AC/Delco pumps have proven to be a reliable fix, the aftermarket pumps only last for a month or two sometimes. Check fuel pressure under the hood and power and ground to fuel pump at electrical harness at top of gas tank. This truck needs a fuel pump.
try to turn the engine by hand on the front cranshaft pulley with a socket, if turns engine is ok, but if not engine is gone,
and not only check the powers also check for a good ground,
and clen the batterie conectors very wheel even if they look clean electrical systems are very tricky