1988 JEEP CHEROKEE oil filter
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Engine cold and choke too Adjust choke and
lean allow engine to warm-
up
Defective spark plugs Replace spark plugs
Defective coil Replace coil
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Faulty Low Speed Clogged idle transfer slots Clean idle transfer
Operation slots, see FUEL
Restricted idle air bleeds Disassemble and clean
and passages carburetor, see FUEL
Clogged air cleaner Replace air filter
Defective spark plugs Replace spark plugs
Defective ignition wires Replace ignition wire
see ENGINE PERFORMANCE
Defective distributor cap Replace distributor
cap
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Faulty High Speed Incorrect ignition timing Reset ignition timing
Operation see ENGINE PERFORMANCE
Defective distributor Replace advance
centrifugal advance mechanism
Defective distributor Replace advance unit
vacuum advance
Incorrect spark plugs or Check gap and/or
plug gap replace spark plugs
Faulty choke operation Check choke and
repair as required
Clogged vacuum passages Remove restrictions
Improper size or clogged Check jet size and
main jet clean, see FUEL
Restricted air cleaner Check filter and
replace as necessary
Defective distributor cap, Replace cap, rotor or
rotor or coil coil
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Misfire at All Defective spark plugs Replace spark plugs
Speeds
Defective spark plug wires Replace spark plug
wires
Defective distributor cap, Replace cap, rotor,
rotor, or coil or coil
Cracked or broken vacuum Replace vacuum hoses
hoses
Page 1260 of 1378
![JEEP CHEROKEE 1988 Service Repair Manual Vacuum leaks Repair vacuum leaks
Fuel lines clogged Remove restriction
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Fuel lines clogged Remove restriction
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Vacuum leaks Repair vacuum leaks
Fuel lines clogged Remove restriction
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Hesitation Cracked or broken vacuum Replace vacuum hoses
hoses
Vacuum leaks Repair Vacuum leaks
Binding carburetor linkage Eliminate binding
Binding throttle linkage Eliminate binding
Binding choke linkage or Eliminate binding
fast idle cam
Improper float setting Readjust float
setting, see FUEL
Cracked or broken ignition Replace ignition
wires wires
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Rough idle, Incorrect curb idle or fast Reset idle speed, see
Missing or idle speed see ENGINE PERFORMANCE
Stalling
Incorrect basic timing Reset ignition timing
see ENGINE PERFORMANCE
Improper idle mixture Reset idle mixture,
adjustment see ENGINE PERFORMANCE
Improper feedback system Check feedback system
operation see ENGINE PERFORMANCE
Incorrect spark plug gap Reset spark plug gap,
see ENGINE PERFORMANCE
Moisture in ignition Dry components
components
Loose or broken ignition Replace ignition
wires wires
Damaged distributor cap or Replace distributor
or rotor cap or rotor
Faulty ignition coil Replace ignition coil
Fuel filter clogged or worn Replace fuel filter
Damaged idle mixture screw Replace idle mixture
screw, see FUEL
Improper fast idle cam Reset fast idle cam
adjustment adjustment, see TUNE-
see ENGINE PERFORMANCE
Improper EGR valve operation Replace EGR valve
Faulty PCV valve air flow Replace PCV valve
Choke binding or improper Reset choke or
choke setting eliminate binding
Page 1292 of 1378
![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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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)