Cranks but no spark/start 4.7 v8 G.cherokee

Check the fuel pressure - sounds like a malfunctioning pressure regulator.

Engine cranking, check primary voltage to ignition coil, dark green wire with orange tracer. Use a test light. That is the same voltage circuit for fuel injectors. That voltage comes from asd relay. I'm not saying the relay is faulty. The computer has to see both the cam and crank sensors signals or it won't ground the relay.
Could be other issues? You did visually check for spark at the spark plugs?
Any applicable trouble codes?

in usa this engine is L34 or U20SED
i guess you are working with no scan tool????
that be super hard, to out guess the EFI system.
we cant see electrons so.. tools make the man.
DOHC engine
if there is no spark times 4, did you check all 4?
After all 1 cylinder or all 4 can fail. telling the
mechanic big clues
if sparks ok test fuel works (sprayed).
is the timing belt under 60,000 miles new?
if the belt slips compression x4 drops radically.

head off, well i think this is an interference engine.
its DOHC, so if you bent the valves by driving until the belt slipped, oops, you killled the head.

funny thing is no history here
am I to guess, engine died? and the head was removed
was the head tested, when off?
new head, rebuilt head,
check for warp
and do the valve test with I use kerosene
in the combustion chamber to see if the valves are not bent, if bent the fluid leaks to the ports.
oldest test on earth this, 100 years. old.
and more, take it to a machine shop (head)
and get it pressure tested, etc>> now that be savvy.

you need to replace the head gasket and have the head machined flat

Have you checked for spark to the spark plugs?

check all your ground wires and look make sure no wires are pinched between head and block also check the distribitor for wear wobbling around in side of it

YOU HAVE A BAD HEAD GASKET! BURNING ANTI FREEZE

If it over heated, could have bad head gasket's, fill radiator with water, crank engine with radiator cap off, if water is push out of radiator while cranking, bad head gaskets', also remove spark plug's, crank engine if any water, bad head gasket, also when spark plug's removed, check for any water on them.If there is any water on plug's, bad head gasket, also could try doing a cylinder compression test, if bad compression, head gasket, no compression, wont start that way.

you may have bent the flex plate ring.so it might be to far away from the crank sensor air gap.

a bad crank sensor or dist pickup plate can cause this.... check the fuses in the fuse block under the hood for any blown ..... a bad auto shut down relay may cause it .....try putting a test light on the green and orange wire and see if it lights up when you try to crank it