Ill not guess, (too much pit time)
94' , 4L engine.
the ASD relay is first.
ever consider that?
it drops for up to 8 reasons, and the scan tool tells you every time that happens and why.!
see why here and stop guessing, CKP is just one of 8 reasons.
if the ASD does not drop at sta,ll then that is a whole other matter.
ask (stalls have vast reasons, if not ASD drop)
what matters most is ASD, ASD !
my innova 3140 (does 94s, like most DIY tools can't)
will show the errors. (the flashcode trick can do so too)
cKP is. code "11" DTC.
http://www.fixkick.com/Jeeps/ASD.html
sure bad wiring, it like saying in the rain we get wet
EFI is all about good wiring and that includes GROUNDs
sure my 88 and 96 jeep both failed the engine side ground
only tight hard left turns up hill, and both had a bad factory ground lug on right side of engine, and was a bad crimp in the factory.
(i bought them both new)
but this is antictotal, and i hate that and guessing,
why not do the tests, and let the chips fall were they may.
in one case the ckp died. (no ground)
in all cases the scan tool showed me the reasons.
here are some examples.
1: scan tool died, cant communicate found no power to PCM.
in once case a loose fuse or one cracked inside, did this.
2: scan tool reboots as PCM reboots, oops lost power again to pcm. (power or ground, takes 2, to tango)
3: see sensors go dead?
4: see coil ignitor fail.
5: see IMMO go active on the fly?
6: see tacho line go dead.
see pump drive go dead, (dtc for that too)
and more. it the not scanning it for these critical errors is the cause.
we have logging voltmeter, that allows us to monitor power to all things in the EFI system to catch random drop outs.
PS ever done the flash deal.
this is in the FSM book 1994
it's no secret
https://www.youtube.com/watch?feature=player_embedded&v=kuHEzOQGtOs
posted this like 100 times now.
nobody wants to learn or use scan tools my guess....
ps2:
watch out for the dirty flash test.
it has the nasty habit (fact) of clearing key spark failures
at key off.
oops.. you just cleared the error , turned off key.
dang.
that is why scan tools exist , ! so you dont miss stuff.!!!!
yes, bad wires happen as do 100s of other things, ill not guess or give my 100 antidote answers. why do that (it's endless that) yes, i too have 1000 answers guessing (held)
DOES THE ASD drop or not? yes/no.?
before the stall.(or during it)
if the answer is yes, then the scan tool answers your questions , that is which of the 8 ways that cause this.
lets be clear, PCM caused stalls. !!
the DTCs tell you which,
guessing the 8 ways will be hard, or impossible. if you ignore this check.
mORE, ways, (over 50 there are)
if the scan tool fails to show a code?DTC
the means, engine shut down for other reasons the BRAIN (PCM) could not detect.!!!
EG: not ASD caused !
1: bad spark is one thing, ever do a full tune up ever>?????? might this be the time?
2: low fuel pressure, no the PCM cant detect that or the rusty wires to it.
nor the bad FPR, nor anything wrecking regulation here.....
3: or insane high fuel pressure flooding engine and stalling it.(fpr stuck closed ask for tests, its in the book , if you need facts like that)
we learn all these facts or better EVIDENCE by tests and simple inspections.
i see engine stall , scans show 0 (live scanned not useless trips to autozoned)
i Pull the spark plugs. omg its soaking in fuel , omg2, all 6 are or just one,?
all 6 i check fuel pressure. or unplugged ECT?(scan it for 180F first?)
or just one? do leak down test on THAT injector.? (one cylinder foods.so...)
see? INSPECTIONS and test find problems.
and never guessing.
unless you have the luck of the Irish...
few do....
ok now more.
i use my scan tool and do live scanning
and see the MAP reads ALL wrong.
or any of the other sensors.
all this is evidence.
not looking, is the cause for going broke guessing. (seen here vast)
ops the scan tool shows the PCM is not in closed loop status hot.... oops'
we fix that first. (gross misfire top cause)
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Check for cracked or frayed wire on the tdc sensor it or the sensor wire harness may be compromised it then stretches once it gets hot causing an open which means engine turns off. happened to me on 1993 cherokee no one found this problem but me and my genius friend. I would drive and like that bang it would die.
The typical resistance of CKP sensors is in the range of 200__2000 ohms if your sensor read infinite you need remplace.
SOURCE: my 2000 jeep grand cherokee starts but kills after
CHECK IDLE AIR CONTROL SOLENOIDALSO SEE IF YOURS HAS A SHUTDOWN RELAY IN RELAY BOX
SOURCE: crank position sensor
need to know what engine but on six cylinder it is on the bell housing at the left rear of engine,on 5.2/5.9 it is on the right side behind the head in the block,and on 4.7l it is on the engine block above the starter.
SOURCE: 1999 4.0L Jeep Grand Cherokee shuts down after 20-30 minutes.
I'd suggest the ignition control module, however I'd have a certified mechanic check it out just in case...
SOURCE: 1995 jeep grand cherokee barley runs after warmed up?
fuel system problem; filter, pump, injectors.
SOURCE: 1994 jeep grand cherokee laredo starting problems
Check to see if the fuel pump is running after it shuts down...could be a relay or the pump itself (overheating internally) Checked the fuel filter yet? Some crank sensors need to be shimmed. If it's too close to the flywheel even though you recently changed it, if it's too close to the wheel it can fail again. May not be the case but worth checking over. Also check the ceramic resistor on the left fender near the master cylinder if you have one. That too can cause problems.
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