I have a 2001 Jeep Wrangler, 4.0L. The Jeep was running fine. The next morning the engine would only turn over and will not start. I have gas up to the injectors. Any suggestions where to start?

spark

take it to an accredited service center and have the fault codes read
guessing just costs money and seldom fixes the fault

check fuel filter and also check if O2 sensors are working on exhaust

Just tell them you think the computor is bad

It may be piston slap. This is caused by either engine wear with the piston bores being too large for the pistons, or by poor manufacturing tolerances, or a combination of both.

To test for this, start the engine up first thing in the morning and run it for about thirty seconds while you listen carefully and memorise the sound and intensity. Turn the engine off quickly, remove the spark plugs and put two squirts of motor oil into each cylinder. Reinstall the plugs, start the engine up again and listen. If you have piston slap the noise will have been greatly reduced or even eliminated for about thirty seconds seconds and then returns.

The fix is to rebuild or replace the engine, but if it works just fine then don't worry. Many slappy engines keep going for tens of thousands more mile. The fact that your knocking is only at idle suggests your crankshaft is not to blame.

i was told that if the jeep all of a sudden didnt start on its own without giving it gas, then next time you start it hold the pedal all the way to the floor and it resets something in the computer and sets you back to normal.

Check EGR value, clean or replace. Also PCV valve replace it is cheap.

hello first thing to check is your fuses make sure there all good sounds like one blew ign,ecm,pcm, goodluck

Try holding your gas pedal all the way down while starting.