1988 JEEP CHEROKEE spark plugs replace
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setting, see ENGINE
PERFORMANCE
Vacuum leak Eliminate vacuum leak
EGR valve malfunction Replace EGR valve
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Poor Gasoline Cracked or broken vacuum Replace vacuum hoses
Mileage hoses
Vacuum leaks Repair vacuum leaks
Defective ignition wires Replace wires
Incorrect choke setting Readjust setting, see
ENGINE PERFORMANCE
Defective vacuum advance Replace vacuum advance
Defective spark plugs Replace spark plugs
Binding carburetor power Eliminate binding
piston
Dirt in carburetor jets Clean and/or replace
jets
Incorrect float adjustment Readjust float
setting, see FUEL
Defective power valve Replace power valve,
see ENGINE PERFORMANCE
Incorrect idle speed Readjust idle speed
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Engine Stalls Improper float level Readjust float level
Leaking needle valve and Replace needle valve
seat and seat
Vacuum leaks Eliminate vacuum
leaks
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VACUUM PUMP - DIESEL TROUBLE SHOOTING
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.
NOTE: Diesel engines mechanical diagnosis is the same as gasoline
engines for items such as noisy valves, bearings, pistons,
etc. The following trouble shooting covers only items
pertaining to diesel engines.
VACUUM PUMP (DIESEL) TROUBLE SHOOTING CHART
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CONDITION POSSIBLE CAUSE CORRECTION \
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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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\](/manual-img/16/57037/w960_57037-1291.png "JEEP CHEROKEE 1988 Service Repair Manual All 2.5L engines use a Bosch positive engagement starter.
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 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)