I'm frank and I have a 98 dodge ram 1500 5.2 liter that cranks but won't start and the crankshaft position sensor has been changed 3 times the camshaft sensor was changed so was the distributor cap and rotor the spark plugs and wires also changed and the PCM was changed and ignition coil was changed and tested still cranks and don't start. Please help I need to know what to check next

 

Are you not getting fuel or spark? Could be the fuel pump. Are you hearing the pump energize/buzz at the tank (you may need someone to turn the key to on and another person stand by the tank to listen out for the fuel pump, as I believe the relay only allows it to stay on for a few seconds before it cuts out)?

Also, do you have a scanner? Any codes?

 

Check how much money is left in your wallet. Sorry but I find it frustrating when people unload the parts cannon instead of diagnosing the problem. You could have a blown fuse or a failed relay which would be a cheap 5 minute fix.

You need a OBD2 scan tool with live data and a voltmeter to do any meaningful diagnosis. Along the lines of what AtomicDog suggested, check for 12V at the dark green/orange wire at the coil. Double check for 12V at one of the fuel injectors (same colors). They are fed by the same power feed but there are splices in the path. Then, check that the scan tool can talk to the PCM. Next, pull the wire from the coil at the distributor and check if there is spark during cranking. If there is, spray some starting fluid into the throttle body and see if it barks off. If it does it's a fuel problem, check fuel pump relay and fuel pressure.