Question about 1998 Jeep Cherokee

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Name is rich i have a 97 jeep cherokee 136,000 on it when driveing it just shuts down it used to do it once in awhile then every 23 miles now i can go less than 10 and it just shuts down its a 4.0 i've hAD PUT ON 3 DIAGNOSTIC 3 PLACES NOW THIS IS WHAT I DID SO FAR SPARK PLUGS-CATALYTIC CONVERTER-MUFFLER-AUTO SHUT DOWN RELAY-IAC-MAP-THROTTLE POSITION SENSOR-SMP OXYGEN SENSOR-R&r CRANK SENSOR-MANIFOLD AIR TEMPERATURE (MAT)SENSOR- NOW WHEN IT DIES BOGS CHUGS SHUTS DOWN NOW IF I LET IT SIT FOR A HOUR IT START RIGHT UP AND GO IT CAN GO FOR WEEKS OR LONGER TILL IT HAPPENS JUST LIKE THAT IT USED TO JUST DO IT ON THE HIGHWAY BUY NOW HOW KNOWS WHEN ?? KNOW ONE SEEMS TO KNOW I'M THINKING FUEL PUMP ?(RICHSASSEVILLE@YAHOO.COM)

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  • Jeep Master
  • 20,706 Answers

It always restarts instantly or only when cold or????????????

THAT IS CALLED STALLING, 4.L I-6
BUT need to know some facts first, here they are.
1: you failed to use a fast right foot, stalling to save it.
answer: easy, hard, impossible , which was it??>>??
costs you nothing to do that or report it.!!!
2: did any lamps dim just at the stall????? called electric DC power failure. radio, head lamps, dim or anything else beside the Engine stall,
3: the 4.0L inline 6 (owned 3 cars with it) my 2nd car only stalled in tight left turns, the ground lug(new car) on right rear of head, was never crimped right in the factory and failed, (kills all EFI dead as a door nail too!) I know it was engine flex related by doing tests and BINGO but that is just antidote evidence and useless in most cases. but is illustrative of just what can go wrong (LOTS),
I also knew the right foot actions failed, and was ASD drop.

4: no mention at all if the CEL lamp stuck on (running)
CEL comes on key on to prove lamp is good. this is not an error.
CEL also comes on at all stalls see line above, for why.
5: your shot gunned the EFI, why do that?
why not use all that wasted hard cash on a real scan tool
for way less I might add.. yes really and then can fix this car and may the next 2 owned cars, buy a tool 2008 or newer !!!

if you had such a tool and scanned the PCM at the stall.
every 10 miles( or just one time)
then you'd have the reason. why, (or not)
1: yes you get DTCs, there are 8 possible just for ASD drop alone. including the SKIM lamp turned on and you failed to see that IMMOBILIZER lamp glow at STALL. i think yours has no VTSS/SKIM/SKIS, immo... so ill skip this....

2: no, no errors, no pendings either (keep the key on and scan do not turn off the key, and see if pendings show errors.
many a DTC take 1 , 2, or 3 hot trips to set. so PENDINGS are very very important, to look at. Push the button pendings now.
if no errors at all, then it must be fuel pressure loss.

or a bad engine, a bad engine can in fact CHUG
what if a valve in the head stuck open.>? now is 5 cylinder engine.

recap:
yes fuel pumps can go dead, intermittently, (bad segments on the pump motor commutator. does this) hitting side of tank can wake it up on no starts
bad engine, do chug.
bad spark plugs. ok new. gapped right?
bad spark plug wires? get 6 new NGK mag wires now.
if the spark wires are 17 years old , get them the H3LL out of there now.
the cheap carbon wires can fail at engine flex. or hot, or damp
the distributor cap, and rotor are next. all part of a 10 year tuneup
in my book.

if live scans show ok, the pump pressure may be dropping
the SM covers this , says all things the ECU are blind to.
blind things in short.
1: engine can fail and the dumbb ECU does not know why,
sure it might show P300 errors, but is not for sure it will.
2: pump pressure wrong.
3: loss of DC power, the ECU needs 10-15v to run
if the power is now 0, how can the ECU brain think,
answer IT Cant nor can it monitor or report errors with ZERO POWER>
4: the ECU (its a pain yes) does not report many errors
until many trips. but now cars starts and so it never reports that last stall. read the SM and read the rules on DTC trips, and understand this better.

in my PC here it can show me errors I had 1 year ago.
in a log file
cars have no such log file. , only a TRIP fail. and pendings and freeze frame.
to get the same effect as my nice DT PC , on a car
we can use a scan tool , ours logs. and can drive for a week
and log all ECU/PCM errors and all live sensor data for a week.
so in effect I can do just that. see all errors for a week or a day.
mine has a RECORD button,
whole thing set me back a whopping, $200 (Palmer software too)
that's

the key to finding the issues are , for 100 + years.
1: engine bad.
2: spark bad. do the full tune up this time.
3: bad EFI , fueling. for many reasons

there are tests for each. ask.

Posted on Mar 25, 2017

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Posted on Jan 02, 2017

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SOURCE: jeep won't start until a clicking sound comes from fuse box

The click you hear is the fuel pump relay. It gets its signal to energize from the PCM.If you have a faulty Crankshaft Position Sensor, the PCM will not work. Check for a bad fuel pump relay and also all of the other sensors: Camshaft Position Sensor, MAP Sensor, Idle air Control, Intake Air Sensor,etc.

Posted on Apr 27, 2009

  • 90 Answers

SOURCE: 96 cherokee was missing/cutting out/dying out.would crank after sitting,now it wont start

the crankshaft position sensor controls spark and if faulty would give the symptons you have described you need to get this checked first

Posted on Jun 22, 2009

  • 183 Answers

SOURCE: It dies out of the blue. Sometimes at stop signs,

ECM is probably going bad... Try heating it with a heat gun... Sometimes that will trigger a shut-down and let you know if that is it.

Posted on Oct 12, 2010

  • 13 Answers

SOURCE: I have a 97 grand

You did reset your timing after all te new parts correct? If not start there. Also if it still give the crank postistioning sensr as your error then you may have it pluged in wrong(i know, i know! Ive seen it happen though), or perhaps there is a problem with that circut and your ECM. But i do think you have first off.

Posted on Apr 17, 2011

  • 2926 Answers

SOURCE: My 200 jeep grand cherokee

Before all this work was performed and money spent on parts, was the PCM checked for any DTC's?? If so, what was the read out?

Posted on Jun 08, 2011

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