1998 Jeep Grand Cherokee - Page 9 - Answered Questions & Fixed issues

the cluster pull is in the FSM book , like all cars.

see ZJ, RTM


1998 Jeep Grand... | Answered on Feb 13, 2014 | 49 views

great question the ASD, a key relay to sustained starts and running.
and told the engine, bravo !!!
post the DTC error code.
The ASD can drop out for many reasons, post all DTC codes
and never forget, crank for 5 seconds then look for DTCs
and pendings....


see wiring page
see PDF page 22, BINGO.

1998 Jeep Grand... | Answered on Feb 13, 2014 | 211 views

stalls are complex. over 50 ways to stall any gas engine.
first is not doing a tuneup.
1: lost 12vdc power to EFI system (dash goes dead)
2: lost engine compression
3: lost spark
4: bad fueling. (too much or too little can stall any engine)

early 4L engine has EGR and it can stall any engine.
and on all 4L, he ISC loves to stick.
so the #1 test, is , can you save the stall, with a fast right foot.
no one ever answers this.... sadly.

1998 Jeep Grand... | Answered on Feb 10, 2014 | 242 views

Well, it's FT-RWD with 4WD. Is it in park? Is the parking brake on?

To get it to rotate, since it's a drive axle, the transmission needs to be in neutral with the parking brake disengaged.

1998 Jeep Grand... | Answered on Feb 08, 2014 | 47 views

double posted, backup one. post

1998 Jeep Grand... | Answered on Feb 06, 2014 | 15 views

sure it will , setting a dizzy takes following every step in the FSM
changed, that mean new dizzy?
if not, match marking parts, puts the back right every time.
but not a new dizzy that takes a new timing, setup.
look in olden days, even carbs.
setting the static, timing.
read the FSM.
here it is for free

1998 Jeep Grand... | Answered on Feb 06, 2014 | 42 views

double posted. back up 1

1998 Jeep Grand... | Answered on Feb 06, 2014 | 44 views

just driving? never starting>
tune up time.
does it hot and cold engine.
tune it up. do the full 60k tuneup in the operators guide. lost that?

1998 Jeep Grand... | Answered on Feb 06, 2014 | 43 views

part of the steering linkage or a stabilizer bar ?

1998 Jeep Grand... | Answered on Feb 01, 2014 | 53 views

wiggle steering wheel this time.
if dual cut key try inverting key, or use the spare key.

1998 Jeep Grand... | Answered on Jan 27, 2014 | 115 views

which engine of the many, ??????
no start but cranks ROBUSTLY right?
turns over means zero, the starter motor and engine both can TURN OVER thus , no meaning, What counts is the crank shaft spins.
called Cranking.

1: check all fuses on both boxes.
2: Is dash I/P cluster CEL lamp glowing keyon?
3: I then connect my scan tool and crank for 5 seconds, not 4 , but 5.
3A: got DTC's (errror) for CMP , CKP or spark or dead RPM?
thats 4 checks,, got them, ? yes, BINGO.
the ECU will not INJECT fuel of those are bad. ever.
there are exceptions, but those guys get lawsuits....
4: above is ok , i check spark (some do this first. sure thats makes sense , always)
5: ok I got spark on all cylinder, NO , fix that or do step 3 again.
6: i try test fuel, I spray it in and BAM it runs for 3sec, and dies.
if it dont run, are those 100k miles spark plugs long dead???? ever do tuneups, ever?
if runs 3 sec, and sound great. then you lost fueling.
i check for flooding only if spark is good.
if you get here, the story can go long play, as fueling is complex.
( no injections, leaking , clogged, ECU inputs all wrong, fuel pump dead or weak, FPreg fubar. long..... ask.)

1998 Jeep Grand... | Answered on Jan 23, 2014 | 177 views

check for a loose heat sheild on exhaust system usually on top of catalytic converter....happened to me

1998 Jeep Grand... | Answered on Jan 20, 2014 | 144 views

Possibly a bad piston

1998 Jeep Grand... | Answered on Jan 20, 2014 | 160 views

which engine?
post the symptoms, please.
my guess, it wont start?
or stalls?
and spark is 100% good (tests)
and now you suspect fueling system loss?
fuel is last check.
after good engine, good spark and if good , try test fuel (spray)
if motor starts for 3second test fuel, then you have lost fueling
we then do the fuel pressure checks in the FSM , every step, (6)
we check pressure cranking, many engines must crank to get fuel..

1998 Jeep Grand... | Answered on Jan 14, 2014 | 90 views

why assume most expensive part in EFI system is bad. ?
there is no need to guess. ever. (sure with no tools, gue$$ing.)


watch the vid, and tell just how far you got.

did you check all fuses FIRST??? in both BOXES?

1998 Jeep Grand... | Answered on Jan 11, 2014 | 80 views

Could be a broken wire harness.

1998 Jeep Grand... | Answered on Jan 05, 2014 | 71 views

which engine, no engine, no joy. 4.0L inline 6 cyl?

yes, in most cases. most got from 0.5 to 4v.
most ECU learn this as you drive, others the TPS must be calibrated
all this is covered in the FSM>
my online source shows , NO Calibration, proving Autocal ECU.

why not post symptoms, ????
the TPS when bad, have huge lists of symptoms.
and the ECU OBD2 diagnosics on TPS is very poor.
it see the TP go wild and just thinks driver is nuts.
so no errors.just engine goes nuts.
(unless dead open or shorted) (new TBW cars ,totally diffr)
what first happens (pure physics) is the carbon in the POT
wears. and the TP voltage glitches (at your oldest longest used cruise speed, or at near idle (city car, hiway car ?)
it glitches, the ECU goes to ENRICH mode.
or fails to 0v, a negative glitch (scopes rule) and ENRICH mode
fails. and engine BOGS on the fly. then catches up.
how is that.? (it does far more, ask)

here is the fsm quote for 4L
The Throttle Position Sensor, or TPS is connected to the throttle shaft on the throttle body. It sends throttle valve angle information to the PCM. The PCM uses this information to determine fuel delivery volume.
The TPS is a potentiometer with one end connected to 5 volts from the PCM and the other to ground. A third wire is connected to the PCM to measure the voltage from the TPS.
As the throttle valve angle is changed (accelerator pedal moved), the output of the TPS also changes. At a closed throttle position, the output of the TPS is low (approximately .5 volts). As the throttle valve opens, the output increases so that, at wide-open throttle, the output voltage should be above 3.9 volts.
By monitoring the output voltage from the TPS, the PCM can determine fuel delivery based on throttle valve angle (driver demand).
(comments, by me, id does far more than that.. ask)

1998 Jeep Grand... | Answered on Dec 31, 2013 | 180 views

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