1988 JEEP CHEROKEE fuel filter
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Vacuum leak Repair vacuum leak
Improper float bowl fuel Reset float
level adjustment, see FUEL
Clogged air bleed or idle Clean carburetor
passages passages, see FUEL
Clogged or worn air cleaner Replace air filter
filter
Faulty choke vacuum Replace diaphragm,
diaphragm see ENGINE PERFORMANCE
Exhaust manifold heat valve Replace heat valve
inoperative
Improper distributor spark Check distributor
advance operation
Leaking valves or valve Check and repair
components valvetrain
Improper carburetor Remove and remount
mounting carburetor
Excessive play in Replace distributor
distributor shaft
Loose or corroded wiring Repair or replace as
connections required
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Engine Surges Improper PCV valve airflow Replace PCV valve
Vacuum leaks Repair vacuum leaks
Clogged air bleeds Remove restriction
EGR valve malfunction Replace EGR valve
Restricted air cleaner Replace air filter
filter
Cracked or broken vacuum Replace vacuum hoses
hoses
Cracked or broken ignition Replace ignition
wires wires
Vacuum advance malfunction Check unit and
replace as necessary
Defective or fouled spark Replace spark plugs
plugs
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Ping or Spark Incorrect ignition timing Reset ignition timing
Knock see ENGINE PERFORMANCE
Distributor centrifugal or Check operation and
vacuum advance malfunction replace as necessary
Carburetor setting too lean Readjust mixture
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![JEEP CHEROKEE 1988 Service Repair Manual All 2.5L engines use a Bosch positive engagement starter.
STARTER SPECIFICATIONS
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STARTER SPECIFICATIONS
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All 2.5L engines use a Bosch positive engagement starter.
STARTER SPECIFICATIONS
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Application Volts Amps Test RPM
2.5L .................. 12 ............ 75 ................ 2900
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ALTERNATOR
All 2.5L engines use a Delco-Remy 10SI or 12SI alternator
with integral regulator.
ALTERNATOR SPECIFICATIONS
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Application Field Current Rated Amp
** Draw @ 12 Volts Output
Standard ................ 4.0-5.0 Amps ........................ 56
Optional ................ 4.0-5.0 Amps ........................ 66
Optional ................ 4.0-5.0 Amps ........................ 78
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ALTERNATOR REGULATOR
All 2.5L models use Delco-Remy nonadjustable regulators,
integral with alternator.
REGULATOR OPERATING VOLTAGE @ 80
F (27C) \
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Application Voltage
2.5L ..................................................... 13.9-14.9
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BELT ADJUSTMENT
BELT ADJUSTMENT - TENSION IN LBS. (KG) USING STRAND TENSION GAUGE \
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Application New Belt Used Belt
"V" Belts ( 1) .......... 125-155 (57-70) .......... 90-115 (41-52)
Serpentine ............. 180-200 (82-91) ......... 140-150 (64-68\
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( 1) - Adjust new P/S belt to 120-140 lbs. (54-64 kg).
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SERVICE INTERVALS
REPLACEMENT INTERVALS \
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Component Interval (Miles)\
Air Filter .................................................. 30,000
Fuel Filter ................................................. 30,000
Engine Oil & Filter ........................................... 7500
PCV Valve ................................................... 30,000
Spark Plugs ................................................. 30,000
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![JEEP CHEROKEE 1988 Service Repair Manual CAPACITIES
FLUID CAPACITIES \
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Applicatio](/manual-img/16/57037/w960_57037-1292.png "JEEP CHEROKEE 1988 Service Repair Manual CAPACITIES
FLUID CAPACITIES \
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CAPACITIES
FLUID CAPACITIES \
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Application Quantity
Auto. Trans. (Dexron II)
Wrangler ......................................... 8.0 qts. (7.6L)\
All Others ....................................... 8.5 qts. (8.0L)\
Cooling System
Wrangler ......................................... 9.0 qts. (8.5L)\
All Others ...................................... 10.0 qts. (9.5L)\
Crankcase (Includes Filter) ........................ 4.0 qts. (3.8L\
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Drive Axle
Front ............................................ 2.5 pts. (1.2L)\
Rear
Commanche
Standard Capacity ............................ 2.5 pts. (1.2L)\
Metric Ton Axle .............................. 4.8 pts. (2.3L)\
All Others ..................................... 2.5 pts. (1.2L)\
Fuel Tank
Cherokee & Wagoneer
Standard ...................................... 13.5 gals. (51L)\
Optional ........................................ 20 gals. (76L)\
Comanche
Standard ........................................ 16 gals. (60L)\
Optional ...................................... 23.5 gals. (89L)\
Wrangler
Standard ........................................ 15 gals. (57L)\
Optional ........................................ 20 gals. (75L)\
Manual Transmission
AX4 .............................................. 7.8 pts. (3.7L)\
AX5 .............................................. 7.4 pts. (3.5L)\
BA 10/5 .......................................... 3.5 pts. (1.6L)\
Transfer Case (Dexron II)
Wrangler ........................................ 3.25 pts. (1.5L)\
All Others
Command Trac ................................... 2.2 pts. (1.0L)\
Select Trac .................................... 3.0 pts. (1.4L)\
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SYSTEM REFRIGERANT CAPACITIES \
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Application Ozs.
All Models ...................................................... 36
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![JEEP CHEROKEE 1988 Service Repair Manual SPARK PLUGS
SPARK PLUG TYPE TABLE \
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SPARK PLUGS
SPARK PLUG TYPE TABLE \
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Application Champion No.
All Models ....................................... RFN14LY
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SPARK PLUG SPECIFICATIONS TABLE \
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Gap: In. (mm) Torque: Ft. Lbs. (N.m)
0.035 (0.89) ................................ 7-15 (10-20)
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FUEL PUMP
4.0L
1) Remove the cap from the pressure test port located in the
fuel rail. See Fig. 1. Connect Fuel Pressure Gauge (J-34730-1) to the
pressure fitting.
2) Start vehicle. Pressure should be approximately 31 psi (2.\
1 kg/cm
) with the vacuum hose connected to the pressure regulator and
39 psi (2.6 kg/cm) with the vacuum hose removed from the pressure
regulator. See FUEL PUMP SPECIFICATIONS TABLE .
3) Check the fuel pump flow rate. A good fuel pump will
deliver at least one liter of fuel per minute with the fuel return
line pinched off. If the fuel pump does not pump adequately, inspect
the fuel system for a plugged fuel filter or filter sock.
4) Fuel pump flow rate can be checked by connecting one end
of an old A/C gauge hose to the fuel test port on the fuel rail and
inserting the other end of the hose into a container of at least one
liter or more capacity.
5) Run the fuel pump by installing a jumper wire into
diagnostic connector terminals D1-5 and D1-6. Be sure to pinch off the
fuel return line or most of the fuel will be returned to the fuel
tank.
Fig. 1: Fuel System Pressure Test Components
Courtesy of American Motors/Jeep Corp.
4.2L
Perform fuel pump test with air cleaner removed and fuel
Page 1296 of 1378
inlet line or filter disconnected at carburetor. Disconnect fuel
return line at fuel filter and plug nipple on filter. Make all tests
at idle speed. See FUEL PUMP SPECIFICATIONS TABLE .
FUEL PUMP SPECIFICATIONS TABLE
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Application Pressure Volume
** psi (kg/cm) ( 1) Pts. (L)
4.0L .................... ( 2) 31 (2.1) ............ 1.0 (.47)
4.0L .................... ( 3) 39 (2.6) ............ 1.0 (.47)
4.2L .................. 4.0-5.0 (.28-.35) ......... 1.0 (.47)
( 1) - Volume per 30 seconds.
( 2) - With the vacuum hose connected to the pressure regulator.
( 3) - With the vacuum hose removed from the pressure regulator.
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ADJUSTMENTS
VALVE ARRANGEMENT
* E-I-I-E-I-E-E-I-E-I-I-E (Front-to-rear).
VALVE CLEARANCE
All engines are equipped with hydraulic lifters. Valve
clearance is not adjustable.
IGNITION COIL WIRE
Remove ignition coil wire from coil and distributor cap.
Check terminals for corrosion and clean (if necessary). Check coil
wire resistance. Replace wire if resistance is excessive.
HIGH TENSION WIRE RESISTANCE (OHMS) TABLE
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Wire Length Minimum Maximum
0-15" .................. 3000 ................... 10,000
15-25" ................. 4000 ................... 15,000
25-35" ................. 6000 ................... 20,000
Over 35" ............... 8000 ................... 25,000
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DISTRIBUTOR
4.0L
Information not available from manufacturer.
4.2L
All models are equipped with Motorcraft Solid State Ignition
(SSI) systems. No adjustments are required.
Page 1305 of 1378
** Draw @ 12 Volts Amp Output
Standard ......... (1) 4.0-5.0 Amps ................. 56
Optional ......... ( 1) 4.0-5.0 Amps ................. 66
Optional ......... ( 1) 4.0-5.0 Amps ................. 78
( 1) - At 80
F (27C). \
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ALTERNATOR REGULATORS
All models use Delco-Remy solid state regulators, integral
with alternator. Regulator is nonadjustable.
BELT ADJUSTMENT
BELT ADJUSTMENT TABLE TENSION IN LBS. (KG) USING STRAND TENSION GAUGE \
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Application New Belts Used Belts
"V"-Belts ......... 125-155 (57-70) ............... 90-115 (41-52\
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Serpentine ........ 180-200 (82-91) .............. 140-160 (63-72\
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REPLACEMENT INTERVALS
REPLACEMENT INTERVALS TABLE \
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Component Interval (Miles)
Air Filter ........................................ 30,000
Fuel Filter ....................................... 30,000
Oil & Filter ........................................ 7500
PCV Valve ......................................... 30,000
Spark Plugs ....................................... 30,000
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CAPACITIES
FLUID CAPACITIES TABLE \
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Application Quantity
Auto. Trans. (Dexron II)
Wrangler ............................... 8.0 qts. (7.6L)
All Others ............................. 8.5 qts. (8.0L)
Cooling System
Wrangler .............................. 10.5 qts. (9.9L)
All Others ........................... 12.0 qts. (11.4L)
Crankcase (Includes Filter)
Wrangler ............................... 5.0 qts. (4.7L)
All Others ............................. 6.0 qts. (5.7L)
Drive Axle
Front .................................. 2.5 pts. (1.2L)
Rear
Comanche
Standard Capacity .................. 2.5 pts. (1.2L)
Metric Ton Axle .................... 4.8 pts. (2.3L)
All Others ........................... 2.5 pts. (1.2L)
Fuel Tank
Cherokee & Wagoneer
Standard ............................ 13.5 gals. (51L)