My 5.7 chevy truck wont start, has spark, module ok, fuel pressure ok, what else can i check?

98 chevy truck ? Rolls over an plays dead ! Crank - no start . The starter cranks the engine but the engine fails to start an run .
Where That Machine

If it cranks good but won't start, have a helper crank it while you visually check for spark. If spark everywhere, use a gage and check proper fuel pressure and fuel injector pulse. Any applicable trouble codes?

I'd get a can of easy start or equivalent and see if it runs then, if so and u say u got fuel pressure it can only be a couple of things really 1 crank position sensor cam position sensor rail pressure sensor if it has 1 or ecu fault

Have you checked for spark at the plugs? Are you certain that the timing chain and tensioner were installed properly? Camshaft position sensor and crankshaft position sensor are OK? Without the right signal, nothing happens. Have you checked the coil packs, plug wires, and spark plugs? If there is no spark while cranking, you'll have to figure out why, and a shop manual is about the only way to go to do that. If you have spark, then you need to check for fuel at the injectors and the proper injector signal. Have you checked for fuel pressure at the rail? Does the fuel pump run? Is the fuel filter plugged?
It could also be a wiring problem somewhere in the electrical harness. If the right wire or wires are broken or corroded, then it could easily keep the engine from running. Even a loose or broken connector or a bent connector pin can cause all sorts of headaches.

If you have spark at all the plugs, the crank sensor should be ok. You should use a gage to check fuel pressure? I don't know engine size? For the 3.1L engine, my info says 40--46 psi.
It is possible to have spark at the plugs, but, the computer doesn't see rpm signal. If that is the case, no fuel injector pulse. The purple wire with white tracer carries rpm signal from ignition module to pcm, that wire has dc pulse, engine cranking. If nothing there, have to check ignition module.
How long since a tune-up? Any applicable trouble codes?

I think your problem is injectors not firing, and is linked to the Powertrain Control Module. Disconnect the battery for 30 minutes to reset the PCM. Reconnect the battery and try to start the car. If it still doesn't start, pull a spark plug and see if the tip of the plug is wet with fuel. If it is dry, then you are not getting fuel to the cylinders. If you have fuel pressure and spark, but noe fuel in the cylinders, it has to be computer related.

Try swapping out the fuel pump relay, if thats good try testing your ignition system components. Start with the module and coil pack. If they are ok check the crank position or cam position sensor (which ever applies).

CHECK BATTERY VOLTAGE FIRST IT SHOULD BE 12.5 VOLTS.IF NOT REPLACE BATTERY HAVE ALTERNATOR CHECKED.IF BATTERY GOOD.HAVE VECHICLE SCAN FOR PCM PROBLEMS - CRANKSHAFT SENSOR PROBLEMS OR CAMSHAFT SENSOR PROBLEMS.IF ALL IS GOOD GET A SPARK TESTER AND FUEL PUMP PRESSURE GAUGE TESTER.IF GETTING NO SPARK PROBLEM COULD BE LOOSE BAT.POWER SUPPLY WIRES AT IGNITION COIL MODULE OR IGNITION MODULE FAULTY.IF FUEL PUMP NOT RUNNING CHECK FUSE ABD RELAY IF BOTH IS GOOD FUEL PUMP FAULTY.

replace the crankshaft position sensor

check to see if you can hear the fuel pump running.just cycle the key to the on position but dont turn over the motor you should hear a humming sound come from the fuel tank.if no sound check your fuses if all ok could be a bad fuel pump
or check to see if you have spark if no spak then it could be the module inside your distributor cap.it also controls the fuel pump.
samboiv