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Is this a jeep? What year and engine size? Any applicable trouble codes?
If it cranks good but won't start, have a helper crank it while you check for spark at the plugs, gasoline engine. If you have spark everywhere, use a gage and check proper fuel pressure. Also, check fuel injector pulse. I can only help with testing.
Durangos are known for crank sensors to go bad. Make sure that your battery is fully charged so you know that isn't an issue. If you don't have the proper equipment, try this.. Your going to need someone else's help for this. Pull one of the spark plug wires, using a screwdriver, put the tip of the screwdriver into the wire and hold the shaft of the screwdriver about a quarter inch away from a good ground source. Have your assistant turn the key and crank the engine while you check to see if you have spark. If you can, visit your local parts store and ask for a noid light that will fit your vehicle. It's usually about $10-$12. The purpose of the noid light is to check for injector pulse. Disconnect the plug for the injector and connect the noid light in it's place. Once again, crank the engine and check to see if the noid light lights up and pulses. If the crank sensor is bad, you should have no spark and no injector pulse. Replace crank sensor if so. If you have spark, check for fuel and or fuel pressure. Listen for the fuel pump to energize when the key is turned. Also try spraying starting fluid into the throttle body. If it starts, your having fuel issues. I hope these tips help. Good luck.
Good fuel pressure, but none to the cylinders? Check the injector circuit. All injectors will have battery voltage to them with the key on. A "noid light" can be used to check both power and ground. The light should be blinking when the engine is cranked. Noid lights are cheap, and just plug into an injector connector. If it blinks with the engine cranking over, the circuit is good-both power and ground.
Is the 30 ltr engine diesel? If so what was the reason and changed the Injectors? Did you follow the correct procedure to renew the injectors? This engine has two oil pumps. One is for the engine and the second one is the high pressure for the injection cranking system. On starting the engine and trying to start are you sure you receive the correct oil pressure to cause the injectors to open? If everything is okey,go to crank or cam sensor or even to the accelerator pedal.Also is better to clean the throttle body from any dirt. Use a scanner to give you the fault .Also bear in mind that these vehicles are fitted with the following secret,if you have a blown brake lights fuse or brake lights bulbs will not start,just engine turn and no engine run. It is the immobilizer activation. Do not over 32 times crank start otherwise you will loose ecu.
My truck did this after I replaced the fuel pump. Turned out to Fuel Pressure Regulator. It would crank and crank but never start. It's located underneath the black plastic manifold on the side of the injectors.
Check the cold start injector useing a digital multimeter with a bar graph. Unplug the injector wires and insert the probes into the wiring plug, crank the engine and the bar graph should pulse if it does remove the injector and with the wiring reconnected and the injector held over a suitable container crank the engine and observe the spray pattern. If insufficient replace injector. This should be a starting point at least
check to see that you have fuel all the way to the engine.to do this: pull the fuel pump fuse and, crank the engine a few times to releive pressure then open the fuel line, cover it with a rag for safety then: replace the fuse and, crank the engine just for a second or, two if no fuel comes out it's another fuel filter probably on the truck frame rail that is the problem or, low pressure from the fuel pump