a r ou n d t h e spa r k plu g. Th is will h elp pr even t for eign
m a t er ia l fr om en t er in g t h e com bu st ion ch a m ber.
(3) Rem ove t h e spa r k plu g u sin g a qu a lit y socket
wit h a r u bber or foa m in ser t .
(4) In spect t h e spa r k plu g con dit ion . Refer t o
Spa r k P lu gs in t h e Dia gn ost ics/Ser vice P r ocedu r es
sect ion of t h is gr ou p.
PLUG CLEANING
Th e plu gs m a y be clea n ed u sin g com m er cia lly
a va ila ble spa r k plu g clea n in g equ ipm en t . Aft er clea n -
in g, file t h e cen t er elect r ode fla t wit h a sm a ll poin t
file or jeweler s file befor e a dju st in g ga p.
CAUTION: Never use a motorized wire wheel brush
to clean the spark plugs. Metallic deposits will
remain on the spark plug insulator and will cause
plug misfire.
PLUG GAP ADJUSTMENT
Ch eck t h e spa r k plu g ga p wit h a ga p ga u ge t ool. If
t h e ga p is n ot cor r ect , a dju st it by ben din g t h e
gr ou n d elect r ode (F ig. 19).
N e v e r a tte m p t to a d ju s t
th e g a p by be n d in g th e c e n te r e le c tro d e .
SPARK PLUG GAP
•
2.5L 4-Cylin der E n gin e Spa r k P lu g Ga p: .89 m m
(.035 in ).
•
4.0L 6-Cylin der E n gin e Spa r k P lu g Ga p: .89 m m
(.035 in ).
PLUG INSTALLATION
Alwa ys t igh t en spa r k plu gs t o t h e specified t or qu e.
Over t igh t en in g ca n ca u se dist or t ion . Th is m a y r esu lt
in a ch a n ge in t h e spa r k plu g ga p, or a cr a cked por-
cela in in su la t or.
Wh en r epla cin g t h e spa r k plu g a n d ign it ion coil
ca bles, r ou t e t h e ca bles cor r ect ly a n d secu r e t h em in
t h e a ppr opr ia t e r et a in er s. F a ilu r e t o r ou t e t h e ca bles
pr oper ly ca n ca u se t h e r a dio t o r epr odu ce ign it ion
n oise. It cou ld ca u se cr oss ign it ion of t h e spa r k plu gs,
or sh or t cir cu it t h e ca bles t o gr ou n d.
(1) St a r t t h e spa r k plu g in t o t h e cylin der h ea d by
h a n d t o a void cr oss t h r ea din g.
(2) Tigh t en t h e spa r k plu gs t o 35-41 N·m (26-30 ft .
lbs.) t or qu e.
(3) In st a ll spa r k plu g ca bles over spa r k plu gs.
IGNITION COIL
Th e ign it ion coil is a n epoxy filled t ype. If t h e coil
is r epla ced, it m u st be r epla ced wit h t h e sa m e t ype.
REMOVAL
On t h e 2.5L 4-cylin der en gin e, t h e ign it ion coil is
m ou n t ed t o a br a cket on side of en gin e (t o r ea r of
dist r ibu t or ) (F ig. 20).
On t h e 4.0L 6-cylin der en gin e, t h e ign it ion coil is
m ou n t ed t o a br a cket on side of en gin e (t o fr on t of
dist r ibu t or ) (F ig. 21).
(1) Discon n ect ign it ion coil secon da r y ca ble fr om
ign it ion coil.
(2) Discon n ect en gin e h a r n ess con n ect or fr om ign i-
t ion coil.
(3) Rem ove ign it ion coil m ou n t in g bolt s (n u t s a r e
u sed on ba ck side of br a cket on som e coils).
(4) Rem ove coil fr om veh icle.
Fig. 19 Setting Spark Plug Gap—Typical
Fig. 20 Ignition Coil—2.5L Engine
X J
IGNITION SYSTEM
8D - 9
REM OVAL AN D I N STALLAT I ON (Cont inue d)
Summary of Contents for Cherokee 1999
Page 1: ...HOFRPH WR WKH HHS KHURNHH OHFWURQLF 6HUYLFH 0DQXDO OLFN 2Q 7KH RJR 7R HJLQ...
Page 19: ...Fig 1 Wheel Alignment Measurements 2 2 SUSPENSION XJ GENERAL INFORMATION Continued...
Page 35: ......
Page 53: ...FRONT AXLES DIAGNOSIS 3 18 DIFFERENTIAL AND DRIVELINE XJ DIAGNOSIS AND TESTING Continued...
Page 54: ...DIAGNOSIS CONTINUED XJ DIFFERENTIAL AND DRIVELINE 3 19 DIAGNOSIS AND TESTING Continued...
Page 77: ...Fig 61 Gear Tooth Contact Patterns 3 42 DIFFERENTIAL AND DRIVELINE XJ ADJUSTMENTS Continued...
Page 86: ...DIAGNOSIS CHART XJ DIFFERENTIAL AND DRIVELINE 3 51 DIAGNOSIS AND TESTING Continued...
Page 87: ...DIAGNOSIS CHART CONTINUED 3 52 DIFFERENTIAL AND DRIVELINE XJ DIAGNOSIS AND TESTING Continued...
Page 112: ...Fig 79 Gear Tooth Contact Patterns XJ DIFFERENTIAL AND DRIVELINE 3 77 ADJUSTMENTS Continued...
Page 122: ...DIAGNOSIS CHART XJ DIFFERENTIAL AND DRIVELINE 3 87 DIAGNOSIS AND TESTING Continued...
Page 123: ...DIAGNOSIS CHART CONTINUED 3 88 DIFFERENTIAL AND DRIVELINE XJ DIAGNOSIS AND TESTING Continued...
Page 143: ...Fig 59 Gear Tooth Contact Patterns 3 108 DIFFERENTIAL AND DRIVELINE XJ ADJUSTMENTS Continued...
Page 185: ......
Page 189: ...Clutch Components 6 4 CLUTCH XJ DIAGNOSIS AND TESTING Continued...
Page 243: ......
Page 251: ...COOLING SYSTEM DIAGNOSIS DIESEL ENGINE 7 8 COOLING SYSTEM XJ DIAGNOSIS AND TESTING Continued...
Page 252: ...XJ COOLING SYSTEM 7 9 DIAGNOSIS AND TESTING Continued...
Page 253: ...7 10 COOLING SYSTEM XJ DIAGNOSIS AND TESTING Continued...
Page 254: ...XJ COOLING SYSTEM 7 11 DIAGNOSIS AND TESTING Continued...
Page 255: ...7 12 COOLING SYSTEM XJ DIAGNOSIS AND TESTING Continued...
Page 260: ...SERPENTINE DRIVE BELT DIAGNOSIS XJ COOLING SYSTEM 7 17 DIAGNOSIS AND TESTING Continued...
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Page 979: ...Fig 26 ABS G Sensor 8W 90 34 8W 90 CONNECTOR LOCA TIONS XJ DESCRIPTION AND OPERATION Continued...
Page 980: ...Fig 27 Rear Lamps XJ 8W 90 CONNECTOR LOCA TIONS 8W 90 35 DESCRIPTION AND OPERATION Continued...
Page 983: ...Fig 30 Liftgate 8W 90 38 8W 90 CONNECTOR LOCA TIONS XJ DESCRIPTION AND OPERATION Continued...
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Page 1034: ...Oil Lubrication System 2 5L Engine XJ 2 5L ENGINE 9 17 DESCRIPTION AND OPERATION Continued...
Page 1075: ...Oil Lubrication System 4 0L Engine 9 58 4 0L ENGINE XJ DESCRIPTION AND OPERATION Continued...
Page 1116: ...XJ ENGINE 9 3 DIAGNOSIS AND TESTING Continued...
Page 1117: ...9 4 ENGINE XJ DIAGNOSIS AND TESTING Continued...
Page 1118: ...XJ ENGINE 9 5 DIAGNOSIS AND TESTING Continued...
Page 1119: ...9 6 ENGINE XJ DIAGNOSIS AND TESTING Continued...
Page 1120: ...XJ ENGINE 9 7 DIAGNOSIS AND TESTING Continued...
Page 1121: ...9 8 ENGINE XJ DIAGNOSIS AND TESTING Continued...
Page 1122: ...XJ ENGINE 9 9 DIAGNOSIS AND TESTING Continued...
Page 1123: ...9 10 ENGINE XJ DIAGNOSIS AND TESTING Continued...
Page 1124: ...XJ ENGINE 9 11 DIAGNOSIS AND TESTING Continued...
Page 1159: ...SPECIFICATIONS ENGINE SPECIFICA TIONS 9 46 ENGINE XJ...
Page 1160: ...XJ ENGINE 9 47 SPECIFICATIONS Continued...
Page 1171: ......
Page 1188: ...Fig 6 Frame Dimensions XJ FRAME AND BUMPERS 13 7 SPECIFICATIONS Continued...
Page 1281: ......
Page 1293: ...Fig 1 Recirculating Ball Type Gear 19 12 STEERING XJ DESCRIPTION AND OPERATION Continued...
Page 1307: ...SPECIAL TOOLS STEERING LINKAGE Puller C 3894 A Remover Pitman C 4150A 19 26 STEERING XJ...
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Page 1504: ...DIAGNOSIS TABLE XJ TRANSMISSION AND TRANSFER CASE 21 181 DIAGNOSIS AND TESTING Continued...
Page 1600: ...A W 4 TORQUE SPECIFICA TIONS XJ TRANSMISSION AND TRANSFER CASE 21 277 SPECIFICATIONS Continued...
Page 1702: ...Fig 3 Hood Components XJ BODY 23 21 REMOVAL AND INSTALLATION Continued...
Page 1740: ...WELD LOCA TIONS UPPER COWL XJ BODY 23 59 SPECIFICATIONS Continued...
Page 1741: ...UPPER COWL 23 60 BODY XJ SPECIFICATIONS Continued...
Page 1742: ...COWL XJ BODY 23 61 SPECIFICATIONS Continued...
Page 1743: ...A PILLAR 23 62 BODY XJ SPECIFICATIONS Continued...
Page 1744: ...A PILLAR XJ BODY 23 63 SPECIFICATIONS Continued...
Page 1745: ...A PILLAR 23 64 BODY XJ SPECIFICATIONS Continued...
Page 1746: ...A PILLAR XJ BODY 23 65 SPECIFICATIONS Continued...
Page 1747: ...B PILLAR 23 66 BODY XJ SPECIFICATIONS Continued...
Page 1748: ...D PILLAR XJ BODY 23 67 SPECIFICATIONS Continued...
Page 1749: ...FUEL FILLER OPENING 23 68 BODY XJ SPECIFICATIONS Continued...
Page 1750: ...CARGO AREA FLOOR PAN XJ BODY 23 69 SPECIFICATIONS Continued...
Page 1751: ...ROOF AND D PILLAR 23 70 BODY XJ SPECIFICATIONS Continued...
Page 1752: ...LIFTGA TE OPENING XJ BODY 23 71 SPECIFICATIONS Continued...
Page 1753: ...ROOF 23 72 BODY XJ SPECIFICATIONS Continued...
Page 1754: ...ROOF XJ BODY 23 73 SPECIFICATIONS Continued...
Page 1755: ...FRAME RAIL 23 74 BODY XJ SPECIFICATIONS Continued...
Page 1756: ...FRAME RAIL XJ BODY 23 75 SPECIFICATIONS Continued...
Page 1757: ...FRAME RAIL 23 76 BODY XJ SPECIFICATIONS Continued...
Page 1758: ...FRAME RAIL XJ BODY 23 77 SPECIFICATIONS Continued...
Page 1759: ...REINFORCEMENT 23 78 BODY XJ SPECIFICATIONS Continued...
Page 1760: ...FRONT INNER FENDER XJ BODY 23 79 SPECIFICATIONS Continued...
Page 1761: ...FRONT INNER FENDER AND RADIA TOR CLOSURE PANEL 23 80 BODY XJ SPECIFICATIONS Continued...
Page 1762: ...REINFORCEMENT FRONT FENDER XJ BODY 23 81 SPECIFICATIONS Continued...
Page 1763: ...BODY SIDE 23 82 BODY XJ SPECIFICATIONS Continued...
Page 1764: ...REAR WHEELHOUSE XJ BODY 23 83 SPECIFICATIONS Continued...
Page 1765: ...REAR INNER WHEELHOUSE 23 84 BODY XJ SPECIFICATIONS Continued...
Page 1766: ...BODY SIDE XJ BODY 23 85 SPECIFICATIONS Continued...
Page 1767: ...BODY SIDE 23 86 BODY XJ SPECIFICATIONS Continued...
Page 1768: ...BODY SIDE XJ BODY 23 87 SPECIFICATIONS Continued...
Page 1769: ...BODY SIDE 23 88 BODY XJ SPECIFICATIONS Continued...
Page 1770: ...BODY SIDE XJ BODY 23 89 SPECIFICATIONS Continued...
Page 1771: ...BODY SIDE 23 90 BODY XJ SPECIFICATIONS Continued...
Page 1772: ...UNDERBODY XJ BODY 23 91 SPECIFICATIONS Continued...
Page 1773: ...UNDERBODY 23 92 BODY XJ SPECIFICATIONS Continued...
Page 1774: ...UNDERBODY XJ BODY 23 93 SPECIFICATIONS Continued...
Page 1775: ...UNDERBODY 23 94 BODY XJ SPECIFICATIONS Continued...
Page 1776: ...UNDERBODY XJ BODY 23 95 SPECIFICATIONS Continued...
Page 1777: ...UNDERBODY 23 96 BODY XJ SPECIFICATIONS Continued...
Page 1778: ...UNDERBODY XJ BODY 23 97 SPECIFICATIONS Continued...
Page 1779: ...UNDERBODY 23 98 BODY XJ SPECIFICATIONS Continued...
Page 1780: ...UNDERBODY XJ BODY 23 99 SPECIFICATIONS Continued...
Page 1781: ...UNDERBODY 23 100 BODY XJ SPECIFICATIONS Continued...
Page 1782: ...UNDERBODY XJ BODY 23 101 SPECIFICATIONS Continued...
Page 1783: ...BODY SEALING LOCA TIONS APPLICA TION METHODS 23 102 BODY XJ SPECIFICATIONS Continued...
Page 1784: ...COWL AND DASH PANEL XJ BODY 23 103 SPECIFICATIONS Continued...
Page 1785: ...DASH PANEL AND FLOOR PAN 23 104 BODY XJ SPECIFICATIONS Continued...
Page 1786: ...FLOOR PAN XJ BODY 23 105 SPECIFICATIONS Continued...
Page 1787: ...REAR INNER WHEELHOUSE 23 106 BODY XJ SPECIFICATIONS Continued...
Page 1788: ...FRONT INNER WHEELHOUSE XJ BODY 23 107 SPECIFICATIONS Continued...
Page 1789: ...BODY SIDE 23 108 BODY XJ SPECIFICATIONS Continued...
Page 1790: ...BODY SIDE XJ BODY 23 109 SPECIFICATIONS Continued...
Page 1791: ...BODY SIDE 23 110 BODY XJ SPECIFICATIONS Continued...
Page 1792: ...ROOF PANEL XJ BODY 23 111 SPECIFICATIONS Continued...
Page 1793: ...FUEL FILLER HOUSING 23 112 BODY XJ SPECIFICATIONS Continued...
Page 1794: ...LIFTGA TE OPENING XJ BODY 23 113 SPECIFICATIONS Continued...
Page 1795: ...STRUCTURAL ADHESIVE LOCA TIONS LEFT QUARTER PANEL 23 114 BODY XJ SPECIFICATIONS Continued...
Page 1796: ...REAR WHEELHOUSE XJ BODY 23 115 SPECIFICATIONS Continued...
Page 1797: ...ROOF BOWS 23 116 BODY XJ SPECIFICATIONS Continued...
Page 1798: ...BODY GAP AND FLUSH MEASUREMENTS XJ BODY 23 117 SPECIFICATIONS Continued...
Page 1805: ...ENGINE COMPARTMENT 23 124 BODY XJ SPECIFICATIONS Continued...
Page 1807: ...SPECIAL TOOLS BODY Remover Moldings C 4829 23 126 BODY XJ...
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Page 1940: ...FASTENER IDENTIFICATION XJ INTRODUCTION 5 GENERAL INFORMATION Continued...
Page 1941: ...FASTENER STRENGTH 6 INTRODUCTION XJ GENERAL INFORMATION Continued...
Page 1943: ...METRIC CONVERSION 8 INTRODUCTION XJ GENERAL INFORMATION Continued...
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