Engine won't start and run?

Have you had the vehicle checked for any engine codes, is the check engine light on. Before you have another fuel pump replace , have some one actually check the fuel pressure . It seems you may have a possible crank sensor issue but I can't tell for sure because i am unable to verify the concern. Have the vehicle checked for code . It seems like you've waisted a lot of time and money replacing thing that that are way out of the norm. Its hard to diagnose intermittent issues . I could be a bad wire that seperates when it gets hot. This issue may take time and someone very skillful with electrical and electronics see if you have any code I'm the memory program or pending program. Than have the actual fuel pressure checked while it won't start if fuel pressure is good fuel pump is good. Then have them check for injector pulse , if there is no pulse you may have a bad crank sensor. I have seen then cause this type of issue . But testing has to be done while symptom accures. When you turn the key to the on position without cranking the engine over can you hear the fuel pump run in the tank for 5 seconds?

https://www.2carpros.com/articles/car-cranks-but-wont-start

Please run down this guide and report back.

Check the EEC relay under the hood. Switch it with another relay with the same part number to see if the vehicle shifts.

If that doesn't work, check for spark and fuel to the engine. One should be missing.

Check fuel pump pressure when this happens. Also, switch the EEC relay in the power distribution box with a different relay with the same part number. One last thing, check the crank sensor if everything else checks good.

First you need three things for the vehicle to start.

Fuel, ignition, compression.

Since I doubt its compression if the vehicle was running just fine untill you tryed to start it one day we can rule that out for now.

Next step is to check for fuel pressure and the presence of ignition at all cylinders.

You can do this by dumping some gas down the throttle body and starting it.

This problem can be caused by a few things. Judging from your description, I would look at the catalytic converters. Have them flow tested to see if they are clogged--sounds like they are. However a clogged cat converter is usually the result of raw--unburnt fuel getting into the exhaust system. Check the spark plugs for wear, and/or, too wide of a gap.

Ok, let us know--good luck.

Hi TAC 96, Welcome to 2carpros and TY for the donation.

For what engine 4.0 or 5.0 liter?

No ignition spark: Inspect and test the following, coil packs, ignition control module and crankshaft position sensor

Try the crankshaft position sensor 1st which is located centered in lower front of engine compartment

It depends on the auto part store if they have the right testing equipment won't hurt to try. Use a digital multimeter to check/test the crankshaft position sensor voltage/resistances as for the coil and ICM you can bring it in

Testing the CPS:

https://www.2carpros.com/forum/posting.php?mode=reply&t=482055&sid=b3ada8c88fa2d9c62c4c5514168f6517

Have you checked the EEC relay?