1988 JEEP CHEROKEE Oil filter
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![JEEP CHEROKEE 1988 Service Repair Manual \b\
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Lube Manual Gearshift Control (4WD Tra](/manual-img/16/57037/w960_57037-997.png "JEEP CHEROKEE 1988 Service Repair Manual \b\
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Lube Manual Gearshift Control (4WD Tra")
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Lube Manual Gearshift Control (4WD Transfer Case)
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Inspect/Repack Front Wheel Bearings (2WD Models)
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Inspect Front Brake Pads & Rotors
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Lubricate Caliper Slide Rails
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Inspect Rear Brake Linings & Drums
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Inspect Brake System Hoses & Lines
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Inspect Shocks for Leakage
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Inspect Tire Wear Pattern
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Lubricate Weatherstripping with Silicone
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Lubricate Door Hinges
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Lubricate Door Locks
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Check Body Drain Holes
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Rotate Tires and Adjust Air Pressure
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Replace
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Engine Oil
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Oil Filter, if it has not been changed in the last 12 months
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Manual Transmission Fluid
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Automatic Transmission Fluid, Filter and Adjust Bands
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Transfer Case Fluid
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Flush and Fill Engine Coolant, if not done in last 24 months
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Lubrication Specifications
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Application Specification
Automatic Transmission .......................... Dexron-IIE ATF
Brake Master Cylinder .......... DOT 3 (SAE J-1703F) Brake Fluid
Engine Coolant ........... Alugard 340-2 & Water (50/50 Mixture)
Engine Oil (
1)
Gasoline Engine
Temperature Range
Above 30
F (-1
C) ........ SAE 20W-40 Or 20W-50 API SH/CD
Above 0
F (-18
C) ......... SAE 10W-30 Or 10W-40 API SH/CD
Less Than 60
F (16
C) ............... SAE 5W-30 API SH/CD
Drive Axles ................................ SAE 75W-90 API GL-5
Drive Axles (Trac-Lok) (
2) ................ SAE 80W-140 API GL-5
Drive Axles (Trailer Towing) .............. SAE 80W-140 API GL-5
Hydraulic Clutch ............... DOT 3 (SAE J-1703F) Brake Fluid
Manual Transmission ........................ SAE 75W-90 API GL-5
Parking Brake Cable Guides ................. NLGI Grade 2, GC-LB
Door & Hood Hinges ............................ Light Engine Oil
Manual Steering Box ............... Multi-Purpose NLGI Grade 2EP
Power Steering Pump ....................... Power Steering Fluid
Page 1001 of 1378
![JEEP CHEROKEE 1988 Service Repair Manual Parking Brake System
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Parking Brake System
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Inspect Shocks for Leakage
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Inspect Tire Wear Pattern
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Rotate Tires and Adjust Air Pressure (Including Spare)
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Replace
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Engine Oil
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Oil Filter
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Spark Plugs
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Ignition Cables
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Distributor Cap and Rotor
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Air Filter Element
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Fuel Filter
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PCV Valve (
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PCV Filter
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EGR Valve & Tube (1987-92)
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Vacuum Operated Emission Components (1987-92)
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PCV Valve (
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Drive Belt (V-Type) (
2)
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Flush and Fill Engine Coolant, if not done in last 24 months
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Automatic Transmission Fluid, Filter and Adjust Bands
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(
1) - Replacement is recommended by Chrysler at this time, but it
is not required to maintain the warranty on the PCV valve.
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2) - Check and replace as needed.
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Lubrication Specifications
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Application Specification
Automatic Transmission .......................... Dexron-IIE ATF
Brake Master Cylinder .......... DOT 3 (SAE J-1703F) Brake Fluid
Engine Coolant ........... Alugard 340-2 & Water (50/50 Mixture)
Engine Oil (
1)
Gasoline Engine
Temperature Range
Above 30
F (-1
C) ........ SAE 20W-40 Or 20W-50 API SH/CD
Above 0
F (-18
C) ......... SAE 10W-30 Or 10W-40 API SH/CD
Less Than 60
F (16
C) ............... SAE 5W-30 API SH/CD
Drive Axles ................................ SAE 75W-90 API GL-5
Drive Axles (Trac-Lok) (
2) ................ SAE 80W-140 API GL-5
Drive Axles (Trailer Towing) .............. SAE 80W-140 API GL-5
Hydraulic Clutch ............... DOT 3 (SAE J-1703F) Brake Fluid
Manual Transmission ........................ SAE 75W-90 API GL-5
Parking Brake Cable Guides ................. NLGI Grade 2, GC-LB
Page 1215 of 1378
\003
TR AN SM IS SIO N S ER VIC IN G - A /T
1988 J e ep C hero ke e
1988 Automatic Transmission Servicing
JEEP
LUBRICATION
SERVICE INTERVALS
Transmission
Check fluid level and condition of fluid at each engine oil
change. Under normal, light duty operating conditions, change fluid,
replace filter and adjust bands every 2 yrs. or 25,000 miles. Under
heavy duty service, change fluid, replace filter and adjust bands
every 12 months or 12,500 miles.
Transfer Case
Check transfer case fluid every 12,000 miles and replace
fluid every 30,000 miles.
CHECKING FLUID LEVEL
Transmission
Park vehicle on a level surface and apply parking brake.
With engine idling at normal operating temperature, move transmission
selector lever through all gears, ending in "N" ("P" for AW-4
transmission). Check fluid level. Fluid level should be between
"FULL" and "ADD ONE PINT" mark on dipstick. Add fluid as needed. DO
NOT overfill.
Transfer Case
Remove fill plug. Check oil level. If level is not up to
fill plug opening, add lubricant until it is.
RECOMMENDED FLUID
Both transmissions and transfer cases use DEXRON-II ATF.
FLUID CAPACITY
NOTE: Transmission and converter capacities are approximate. Fluid
level should always be determined by reading on dipstick,
rather than amount of fluid added.
TRANSMISSION REFILL CAPACITIES
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Application Quantity
All Models
Including Converter ................................ 8.5 qts. (8.0L)\
Without Converter .................................. 4.3 qts. (4.0L)\
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TRANSFER CASE REFILL CAPACITIES \
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Application Capacity
Model 207 ............................................ 4.5 pts. (2.1L)\
Model 208 ............................................ 6.0 pts. (2.8L)\
Page 1216 of 1378
![JEEP CHEROKEE 1988 Service Repair Manual Model 228 ............................................ 7.0 pts. (3.3L)\
Model 229 ............................................ 6.0 pts. (3.8L)\
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\](/manual-img/16/57037/w960_57037-1215.png "JEEP CHEROKEE 1988 Service Repair Manual Model 228 ............................................ 7.0 pts. (3.3L)\
Model 229 ............................................ 6.0 pts. (3.8L)\
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Model 228 ............................................ 7.0 pts. (3.3L)\
Model 229 ............................................ 6.0 pts. (3.8L)\
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DRAINING & REFILLING
Transmission
1) Loosen oil pan bolts, tap pan to break it loose and allow
fluid to drain. Remove pan. Install new filter on bottom of valve
body and tighten retaining screws. Install new "O" ring on fluid
pick-up pipe (if needed). Clean oil pan and install with new gasket.
2) Refill transmission with fluid. Start engine and allow to
run at curb idle for a few minutes. With vehicle on level surface,
engine idling and parking brake applied, move shift selector lever
through all gear ranges, ending in "N" ("P" for AW-4 transmission).
Add fluid up to "ADD ONE PINT" mark on dipstick.
3) Recheck fluid level when transmission reaches normal
operating temperature. Fluid should be between "ADD ONE PINT" and
"FULL" marks on dipstick. Transmission must NOT be overfilled.
Transfer Case
Remove drain plug from transfer case. Remove fill plug for
easier draining. With fluid fully drained, reinstall drain plug. Fill
transfer case to fill plug opening with Dexron II.
ADJUSTMENT
NOTE: Bands on the AW-4 (4-speed overdrive) transmission are not
adjustable. If slippage occurs, bands must be replaced.
KICKDOWN (FRONT) BAND
1) Locate kickdown band adjusting screw on left side of case
(near throttle lever shaft). Loosen adjusting screw lock nut and back
off approximately 5 turns. Ensure adjusting screw turns freely in
case.
2) Using Adapter (J-24063) and 5/16" square socket, tighten
screw to 36 INCH lbs. (4 N.m). If adapter is not used, tighten screw
to 72 INCH lbs. (8 N.m). Back off adjusting screw. See KICKDOWN
(FRONT) BAND ADJUSTMENT table. Hold adjusting screw in position and
tighten lock nut to 35 ft. lbs. (48 N.m).
KICKDOWN (FRONT) BAND ADJUSTMENT
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Application (1) Back Off Screw\
All Models ............................................... 2 1/2 Turns
(1) - Tighten screw to 72 INCH lbs. (8 N.m) and back off indicated
number of turns.
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LOW-REVERSE (REAR) BAND
1) Raise vehicle, drain transmission fluid and remove oil
pan. Locate adjusting screw on rear servo lever. Loosen adjusting
screw lock nut and back off about 5 turns.
2) Tighten screw to 41 INCH lbs. (4.6 N.m) and back off
screw at indicated number of turns. See LOW-REVERSE (REAR) BAND
ADJUSTMENT table. Hold adjusting screw in position and tighten lock
nut to 35 ft. lbs. (48 N.m). Install oil pan and fill transmission
Page 1237 of 1378
Incorrect ignition timing Reset ignition timing,
See TUNE-UP
Leaking valves Replace valves, See
ENGINES
Worn fuel pump diaphragm Replace diaphragm or
or piston piston
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Intake Backfire Improper ignition timing Reset ignition timing,
See TUNE-UP
Faulty accelerator pump Replace accelerator
discharge pump
Improper choke operation Check choke and adjust
as required
Defective EGR valve Replace EGR valve
Fuel mixture too lean Reset air/fuel mixture,
See TUNE-UP
Choke valve initial Reset choke valve
clearance too large initial clearance
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Exhaust Backfire Vacuum leak Inspect and repair
vacuum system
Faulty vacuum diverter Replace vacuum diverter
valve valve
Faulty choke operation Check choke and adjust
as required
Exhaust system leak repair exhaust system
leak
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Engine Ignition timing too far Reset ignition timing,
Detonation advanced See TUNE-UP
Faulty ignition system Check ignition timing,
See TUNE-UP
Spark plugs loose or Retighten or replace
faulty plugs
Fuel delivery system Inspect lines, pump and
clogged filter for clog
EGR valve inoperative Replace EGR valve
PCV system inoperative Inspect and/or replace
hoses or valve
Vacuum leaks Check vacuum system and
repair leaks
Excessive combustion
chamber deposits Remove built-up
deposits
Leaking, sticking or Inspect and/or replace
broken valves valves
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External Oil Fuel pump improperly seated Remove pump, replace
Leakage or worn gasket gasket and seat
properly
Oil pan gasket broken or Straighten pan and
pan bent replace gasket
Timing chain cover gasket Replace timing chain
broken cover gasket
Rear main oil seal worn Replace rear main oil
seal
Oil pan drain plug not Remove and reinstall
seated properly drain plug
Camshaft bearing drain Remove restriction
hole blocked
Oil pressure sending Remove and reinstall
switch leaking sending switch
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Page 1244 of 1378
batteries
Bad starter connections Check connections
or bad starter and/or replace
batteries
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Engine Cranks Bad battery connections Check connections
Slowly, Won't or dead batteries and/or replace
Start batteries
Engine oil too heavy Replace engine oil
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Engine Cranks Glow plugs not functioning Check glow plug system,
Normally, But see FUEL SYSTEMS
Will Not Start Glow plug control not Check controller, see
functioning FUEL SYSTEMS
Fuel not injected into Check fuel injectors,
cylinders see FUEL SYSTEMS
No fuel to injection pump Check fuel delivery
system
Fuel filter blocked Replace fuel filter
Fuel tank filter blocked Replace fuel tank
filter
Fuel pump not operating Check pump operation
and/or replace pump
Fuel return system blocked Inspect system and
remove restriction
No voltage to fuel solenoid Check solenoid and
connections
Incorrect or contaminated Replace fuel
fuel
Incorrect injection pump Re-adjust pump timing,
timing see FUEL SYSTEMS
Low compression Check valves, pistons,
rings, see ENGINES
Injection pump malfunction Inspect and/or replace
injection pump
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Engine Starts, Incorrect slow idle Reset idle adjustment,
Won't Idle adjustment see TUNE-UP
Fast idle solenoid Check solenoid and
malfunctioning connections
Fuel return system blocked Check system and remove
restrictions
Glow plugs go off too soon See glow plug diagnosis
in FUEL SYSTEMS
Injection pump timing Reset pump timing, see
incorrect FUEL SYSTEMS
No fuel to injection pump Check fuel delivery
system
Incorrect or contaminated Replace fuel
fuel
Low compression Check valves, piston,
rings, see ENGINES
Injection pump malfunction Replace injection pump,
see FUEL SYSTEMS
Fuel solenoid closes in RUN Check solenoid and
position connections
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Engines Starts/ Incorrect slow idle Reset slow idle, see
Idles Rough W/out adjustment TUNE-UP
Smoke or Noise Injection line fuel leaks Check lines and
connections
Fuel return system blocked Check lines and
connections
Page 1247 of 1378
Low fuel pressure Test pressure regul-
ator and fuel pump,
check for restricted
lines and filters
No distributor reference Repair ignition
pulses system as necessary
Open coolant temperature Test sensor and
sensor circuit wiring
Shorted W.O.T. switch in Disconnect W.O.T.
T.P.S. switch, engine
should start
Defective ECM Replace ECM
Fuel tank residual pressure Test for fuel
valve leaks pressure drop after
shut down
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Hard Starting Disconnected hot air tube Reconnect tube and
to air cleaner test control valve
Defective Idle Air Control Test valve operation
(IAC) valve and circuit
Shorted, open or misadjusted Test and adjust or
T.P.S. replace T.P.S.
EGR valve open Test EGR valve and
control circuit
Poor Oxygen sensor signal Test for shorted or
circuit
Incorrect mixture from PCV Test PCV for flow,
system check sealing of oil
filter cap
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Poor High Speed Low fuel pump volume Faulty pump or
Operation restricted fuel
lines or filters
Poor MAP sensor signal Test MAP sensor,
vacuum hose and
wiring
Poor Oxygen sensor signal Test for shorted or
open sensor or
circuit
Open coolant temperature Test sensor and
sensor circuit wiring
Faulty ignition operation Check wires for
cracks or poor con-
nections, test
secondary voltage
with oscilloscope
Contaminated fuel Test fuel for water
Page 1254 of 1378
![JEEP CHEROKEE 1988 Service Repair Manual \
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High Pitched Whine Distance too great](/manual-img/16/57037/w960_57037-1253.png "JEEP CHEROKEE 1988 Service Repair Manual \
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High Pitched Whine Distance too great")
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High Pitched Whine Distance too great Align starter or check
During Cranking between starter that correct starter
Before Engine pinion and flywheel and flywheel are being
Fires but Engine used
Fires and Cranks
Normally
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High Pitched Distance too small between
Whine After Engine starter pinion and flywheel
Fires With Key Flywheel runout contributes
released. Engine to the intermittent nature
Fires and Cranks
Normally
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TUNE-UP TROUBLE SHOOTING - GAS ENGINE VEHICLES
NOTE: This is GENERAL information. This article is not intended
to be specific to any unique situation or individual vehicle
configuration. The purpose of this Trouble Shooting
information is to provide a list of common causes to
problem symptoms. For model-specific Trouble Shooting,
refer to SUBJECT, DIAGNOSTIC, or TESTING articles available
in the section(s) you are accessing.
BASIC SPARK PLUG TROUBLE SHOOTING CHARTS
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CONDITION POSSIBLE CAUSE CORRECTION \
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Normal Spark Light Tan or Gray deposits No Action
Plug Condition
Electrode not burned or No Action
fouled
Gap tolerance not changed No Action
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Cold Fouling or Overrich air/fuel mixture Adjust air/fuel
Carbon Deposits mixture, see ENGINE
PERFORMANCE section
Faulty choke Replace choke
assembly, see ENGINE
PERFORMANCE section
Clogged air filter Clean and/or replace
air filter
Incorrect idle speed or Reset idle speed and/
dirty carburetor or clean carburetor
Faulty ignition wires Replace ignition
wiring
Prolonged operation Shut engine off
at idle during long idle
Sticking valves or worn Check valve train
valve guide seals
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Wet Fouling Worn rings and pistons Install new rings and
or Oil Deposits pistons