1996 jeep grand Cherokee will turn over but not start. weak spark. fuel at fuel rail. replaced PCM 1 month ago. replaced crank shaft sensor 3 months ago....

XJ jeep, 1996 no trans told. sadly.
no transmission told mine was stick shift,THEN.

lost your scan tool? OBD2,USA<all scan tools here work. that year.
the engine is EFI run (fuel + spark)

if you crank engine for 5 seconds and release the key.
it tells you DTC P03xx errors if spark is dead

100 year spark test still is valid, and same,way, . "test spark"plug
viewed and cranked, do them all not just 1.
some 4.0 have odd looking 6 coil packs YOu have that?NO.
mine had distributor. only. for spark, my 88 to 99 both

do not replace the CKP sensor on the bell housing WILLLYNILLY
or it fails. (but not this year)
some ckp have gap setting cushion on the end to set the gap
if missing that the sensor is destroyed in 1second cranked.
I will now read the manual to you. 96/4.0L inline loved by all 6cyl.

ok the CKP is PnP, no magic, no slotted holes,no calibration bumper tips, 1996 USA spec.

so got spark? test for spark first the 100 year old way
just like doing the lawn mower or a tin lizzy car.1929
do not lose distributor or spark plug wire firing order.
DO NOT(replace wire sets or plugs 1 by 1, never all at once or it now fails hard.
if the 1996 PCM sees spark hard failure the PCM then
cuts fuel 100% by hard PCM logic, rules.
crash and burn prevention.

if the TPS ground breaks it goes to 4vdc and the PCM cuts fuel 100% (called super secret unflood mode)
newer cars cut fuel for crash sensors but not this car.
cuts fuel if CKP or CMP ARE DEAD. p034X OR P035X
SCAN IT AFTER 5 SECONDS CRANKED, AND DEAD.

compression good x6 150 psi up.
spark good x6
fueling is last. always for all EFI cars, gas./

wont crank or cranks fast but will not start,????????
wow first thing replaced the most expensive part on car.? why ?
replace PCM. ! wow ! what if used PCM (is it used) is bad,?
if so now 2 problems, Compounding every thing,.....$$$$$$$$

last time it ran was 1 week ago , 1 year, what? miles on it?
bad fuel in tank , old?
why not elaborate that key symptom first.?
there is a cluster there.
gauges, warning lights. many, all must glow.
lets do this dance, posted 100 times;. now.

1. head lights work not dim? key in pocket.
2. key on, not cranked ! (covered in missing oper. guide)
3. all warning lights glow, if not battery is weak or fuses blown.
4. and the CEL lamp there, it must glow or the PCM has no power ,that too, is a blown PCM fuse. fact. (or lamp dead)
5. lets say the lamp was dead,CEL the scan tools hows status of the lamp and all else, so use a $10 scan too now. does it communicate with the PCM and show all sensors and not DTC errors? scan it now, cant fix cars now , with no scan tool , buy one, and win on old cars. big time with pay back !!! heck all cars. 96+
6. so the CEL glows now, good, now you crank, now, does the crank shaft turn fast cranking, yes/no. yes !
7. then check for spark , got spark x 6?
8. got spark well test fuel works now , even with dry gas tank.
9. is the ASD relay closing and then dropping,? ( yes, and yes)
10. then that means the PCM cut fuel , on purpose !!!!
11. the scan tool tells you why. it did drop for sure. scan it.

1993 to now , MR. ASD 101

http://www.fixkick.com/Jeeps/ASD.html

PCM is the engine EFI brain, it runs all spark and all fuel all the time. it also dumps the ASD to stop engine fires, by law.
confuses many, and all cars have this, one way or the other,
all EFI cars.

Try to check if some fault code is stored there, try self scanning the PCM (turn on, off, on, off, sna finally stay in ON ignition switch), note the codes in the odometer and sens ud details.

Keep in touch.

need to check to see if you have spark&fuel when dies out/ check grounds wires on engine

need to find whats missing, a engine has to have 3 things to run: spark, fuel, and compression. Find the missing item and you'll find the cure.

If all the fuses are good,replace the crank shaft sensor,this is the problem.

Here's the link and I'm sure you will get the solution of your problem 1996 Jeep Grand Cherokee Service Repair Manual INSTANT DOWNLOAD

Check your fuel pump ,fuel lines,.One of the most overlooked starting causes is fuel delivery. Find the fuel rail to the injectors. Assuming you don't have a fuel pressure gauge, remove the dust cap on the fitting on the fuel rail and press the center pin in the valve to see if there's a good amount of pressure for a very brief second. There will be no continuous pressure unless the engine is running or is being cranked over. Have somebody crank it for you for a second to see if high pressure is present.

If not, first look at the fuel cutoff switch usually located in the inside stowage compartment of the vehicle. See if the reset button clicks when you press it. Next check the fuel pump fuse and relay, and finally the pump itself could be bad.

If you did not replace the CRANK sensor on the back side of the motor this most likely is the problem and a very common one at that.this controls spark and injector pulse,unlike the cam sensor which just shows when #1 cilyder is up.