20 Most Recent 1988 Jeep Cherokee Questions & Answers

That happen to me 3 days ago. The problem is on the ignition key. When you turn it to start the engine, once the engine starts, turn it back a little. is suppose to get back by itself but, get stuck because the cold weather.

1988 Jeep... | Answered on Nov 21, 2019

Sounds like weak fuel pressure. Need to hook up a fuel gauge to verify. Weak fuel pump or dirty filter or restricted fuel lines. Also possible fuel pressure regulator.

1988 Jeep... | Answered on Apr 19, 2019

Quite a puzzle you have that seems impossible, though such things weren't unusual in the old days of bimetal flasher units. The modern electronic flasher relay is designed to flash at a speed dependent on the amount of current drawn by the circuit so if a bulb goes out the speed doubles or thereabouts, giving the driver an indication something is wrong.
Broadly speaking the flasher unit will operate as it is designed within a current range so if there is too much current flowing or not enough it probably won't work at all.

The turn signal switch is usually a very reliable thing and as the left hand lamps light it is fair to assume it is working ok. If the switch is accessible it would be simple to measure the current being consumed by the circuit, which would be nearly 4 amps with the engine running at a fast idle. If it isn't then I suggest you revisit the lamp grounds and other connections.

My instinct is to suspect the hazard warning switch. It is often an unnecessarily complex switch and wiring arrangement and often responsible for turn signal malfunctions. Mostly operating the switch rapidly for a few minutes puts matters right, though if it doesn't I suggest you check the multiway connector behind the switch.

1988 Jeep... | Answered on May 28, 2017

books on 88s are hard to find
owned 2, 88s. French REnix, EFI, just plain old sux....
the TPS is near 1vdc at idle.(out pin)
it's just a POT. 5v /\/\/\/\/ground....
the output is the tap lug called throttle angle.
1v is par.
never 4v that is Wide open throttle, 100%
4.64v is power, spec, is 4.5 to 5.5v , 5v is perfect, its just a 5v power regulator in the ECU that runs external sensors.
that is good.
all 88s love to have the ISC stick when it sticks idle screams.
cleaned mine 100s of times. in 300k miles.
then used Siberian gun oil slick on it and ended that.
this gun oil dries and looks like fry plan TEFLON,
amazing stuff,
the stepper motor jams at the valve cone.
ever 10,000 miles on mine, even both brand new cars.... did.
back to TPS page in the service manual, I have.
"Throttle position sensor is nonadjustable. Only output
voltage can be monitored." (for errors, my comment added.)

that means its learned. never calibrated.

watch out for kids, they hear advance timing and 2x more horse power and they find out later the distributor
is injector sync, and takes a dealer DRB scan tool to set.
leave the distributor alone
the spark timing is carved in the side of the flywheel for ever.
and is not adjustable at all
and that CKP if played with, it is a buggger to re tune,!
its a dang 2 wire Faraday sensor with trick gap setting.

thats it for now..

1988 Jeep... | Answered on Mar 12, 2017

get it serviced,
ask any shop in town to diagnose this.

1988 Jeep... | Answered on Feb 05, 2016

old post but 88s are so rare , so here we go. the answer.
ok its a manual transmission, (i had 2 that year,) the xj and the Comanche PU truck , a pair. (drove the snarf out of them)
the post is weak sorry, but you didnt tell the full story,.
is engine running? fails to shift parked engine off>?????
cant start engine in 1st gear??? (pickone or reverse) with clutch depressed to floor and car moves doing so?) or stalls.....?
that is a bad clutch.
it will start in neutral, with a bad clutch. so..... that be key fact there.

or is this a post that means, car starts ok in gear
but cant shift moving, only a moving car issues ?
we cant guess any of that, it must be stated.

my 88s both had crapppy" Peugot trans", and worse a coaxal
throw out bearing , that took me 10 long hours (4wd)
to replace, my new JK jeep its only 1hrs work on slave.

the first clue (bad) is the clutch master cylinder fluid drops lower
day by day or every week, oops. that be the first clue.

"from 1st" is my only clue.
surely you can better that. do tell.. please.

1988 Jeep... | Answered on Nov 07, 2015

No relay in the circuit.
There is a delay module but if it fails that usually causes the wipers to stop in the middle of travel or only run on high.
And the switch is working if you hear noise coming from the motor. The wiper switch is not the same switch as the turn signals but it is near that assembly.
I would say if you have power to the wiper motor the motor is probably dead or something happened to the linkage to the arms.

1988 Jeep... | Answered on Apr 19, 2015

You have a bad short to frame with some of your wiring to lights. A very close visual inspection with a bright light (I like the new led) should reveal broken insulation or cut. It may have been an accident repair area.

1988 Jeep... | Answered on Mar 08, 2015

one of your tires is probably lower than the other. for a blessed red than the other tires. causative to turn at different speeds. the easiest way to get it out is to raise the vehicle up so all 4 tires off the ground.

happens with me all the time in my 97 Grand Cherokee

1988 Jeep... | Answered on Mar 07, 2015

post in English, this is USA forum.

1988 Jeep... | Answered on Feb 03, 2015

Anything can But it would be cheaper to replace it since you most likely can't get a part number off the old one let alone they are pressed in and for you to remove it and attempt to repress one in IF you can find one will be a nightmare, . around 60 buck from an auto parts store or about 9 hours to attempt to replace 1 with no idea of how long it will last if you find it.. Good luck. BCB

1988 Jeep... | Answered on Dec 09, 2014

main rod starting to go out. still fixable.

1988 Jeep... | Answered on Nov 29, 2014


My car does not shift in second gear.


The first thing to do is replacing the transmission fluid. Metal debris inside the transmission box gets mixed with fluid and can cause similar problems.

The automatic transmission uses throttle position sensor to determine position and opening of throttle.
IF throttle position sensor is defective, the car may have problems shifting into one or more gears.

The automatic transmission is controlled by an electronic control module, that is energizing a set of solenoids to shift into gears.
The control module is a rectangular box, often located behind the dash and wired to transmission. The solenoids are attached to valve body,inside transmission.

If a solenoid is defective, or if control module is defective, the car may have problems shifting into one or more gears.

Problems concerning transmission control module, TPS and transmission solenoid are usually detectable reading fault codes stored on the car main control module (ECU/ECM).

Transmission problems are often returning a code p0700 after an OBDII scan.

Stored codes can be retrieved using an OBD scan reader.
If the car auto transmission is not shifting into gear, talk to the mechanic about the problem.
Only when the car has a really high mileage, or when there is a factory problem there is need to replace the gearbox.
A damaged gear box at low mileage is rather unusual.

on Oct 08, 2014 | 1988 Jeep Cherokee

Sounds like it may be your ignition switch itself, it is making contact to let you start the jeep, but not making a disconnect when you turn it off.

1988 Jeep... | Answered on Sep 27, 2014

1988 is a TRANSITION year, in the USA> is car USA?
from non OBD to OBD1.
USA federal mandated.
on my 2, cars., it had the I6 engine. with FRENCH RENIX system. (junk ,imo, but run it for 500k both cars)"no scan tools"
and that system was pre OBD car. there are no blinking CEL that year. no scan tools,. just magic RENIX.
we used 5 gas to test it.

this changed in 1993 when the french injection was replaced with real Chrysler OBD1 systems. and ECUs,

there is only a EMMIS light and clock timer, most are removed
it just a timer to tell you, hay buddy the leaded gas has killed the CAT
totally useless now. ive removed many,
a 12vdc electric clock, no magic no brains,just that (have the guts)

some smog shops dont even know this, its in the FSM.
every word,,,,
next question, can answer many Renix questions.
my jeeps only loved to crack the SST exhaust manifold.
so kept welding it. (not cast iron thank gosh)

1988 Jeep... | Answered on Sep 01, 2014

loose wiper fuse.
it's and old car, and anything is possible this old. and is.
there are 2 paths I walk and more.
1: visual inspections of each related part, connectors etc.
2: then lay in traps. i use a thing called a VOLTMETER.
i connect it to the motor, (some times for a week)
and when it fails, I look at it. oops i got power to the motor
so the motor is dead. NOW.
or no power, so the supply is bad.
so in that case>? i move the meter test point backwards,
to find WHO dies.
its that simple, and a meter cost $20

even a rusty ground to the wiper base motor mount.
good power means both 12v and ground .

1988 Jeep... | Answered on Jul 20, 2014

Fuel filter is the main culprit when you lose power going uphill. Going level or downhill means that the engine doesn't have to work all that hard and doesn't demand much fuel, so a partially clogged filter can usually flow enough to allow the car to run smoothly. Going uphill requires signficantly more fuel, and if the filter is clogged up, it won't be able to flow enough fuel. This will bog the car down and cause you to lose speed. Change your fuel filter.

1988 Jeep... | Answered on Jul 19, 2014

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