Engine cranks but no fire. - 1999 Jeep Wrangler

Hi William.
What does it mean if your car cranks but doesnt start? A less common cause is a worn starter that draws so many amps while crankingthe engine that there's not enough juice left to adequately power the ignition system and fuel injectors. ... If there's a spark when the engine is cranked, it has ignition. The problem is either fuel or compression..
or read up mor at this link.
Problem 5 Engine Cranks But won Start
or this one.
car cranks but no fire Google Search

Car swings ? It's cranks ! When you turn the key to the start position the engine cranks or does nothing ! No fire on plugs ? No spark ! You want answers to your questions ,get the proper terminology ! You have a crank - no - start condition ! Check crankshaft position sensor , ignition module , PCM - engine computer , coils etc....

Fire ? explain ! When you turn the key to the start position does the engine (starter ) do anything ,spin the engine ? If not ,that is what is referred to as a no crank - no start condition , now if the engine cranks over (spins ) but doesn't start , this is a cranks no start condition . Now which is yours doing or not doing ?

If it won't crank the engine over, how do you know it is not firing? The engine has to be cranking to check for spark. If it won't crank, problem is in the starting circuit, not the ignition system. Test the starter.

Take to car to a diagnostic center, and they will attach a diagnostic machine to the car to see if it's the onboard-computer that's malfunctioning.

If the fuses are all OK, and the starter cranks the engine, but there's no firing, the diagnostic system will tell the tech what it is, there are various reasons there's no firing when the engine cranks,

Someone may say check the disable switch on the transmission, but if that's broken, the starter will not crank the engine.

no engine option size stated, so i wing it..(generic is harder)
ok battery changed, no need for jumper cables now.
engine cranks robustly.
so no fire, i hate to tell you that word means (NOTHING)
there is fire to each spark plug (tip spark = fire) then there
is combustion fire , a goal on all cylinders.
so use the word spark , you then check spark at all cylinders.
please.
if spark is gone on 1 cylinder work that.
if spark is gone on all cylinder we then scan the ECU.
RULE 1, no EFI car , runs fueling unit (IT) thinks(sic) there is spark (3 way checks) this is Crash and fire protection on call cars.
most books fail to say this very important feature in all modern cars.
so that is why spark is 1st. never ever done last.
you crank engine for 5 seconds.
release key, not off. the key yet.
and the scan tool, shows P0340/355 or any codes relate to spark
CMP./CKP ,etc.
and the rpm shows 250RPM cranking, yes,the scan tool can see
RPM cranking and is a TOP check , missed by many noobs.

so now you have spark
on all cylinders.
we cross fingers #1 is good, 150PSI compression on all cylinders, min.
and blame fueling.
A: is it flooding or starving???? the spark tips (i bet its tunedup, huh)
are dry or wet.
B: more later if you get this far.

just oneline says it. for 100 years now. (otto cycle engines)
(cranks ok, compression good,spark good x4,x6, fueling last)

Are you saying the starter is grinding but the engine is not cranking, or the engine is cranking and making noise and not starting ?

Sounds like your fuel pump is going bad. Have your mechanic do a pressure test on it.

it is still under warrenty. take it back to the dealer.

if the fusebox is above accelerator pedal its relay number 1 .best of luck.