Spark Plugs; Specifica Tions; Engine Firing Order-2.5L 4-Cylinder; Engine - Jeep Cherokee 1999 Electronic Service Manual

8D - 16 IGNITION SYSTEM
REM OVAL AN D I N STALLAT I ON (Cont inue d)
Fig. 38 Ignition Switch Removal/Installation
locked in PARK posit ion a ft er key r em ova l. If key is
difficu lt t o r ot a t e or is difficu lt t o r em ove, t h e sh ift
lever-t o-st eer in g colu m n ca ble m a y be ou t of a dju st -
m en t or defect ive. Refer t o Gr ou p 21, Tr a n sm ission
for pr ocedu r es. Ma n u a l Tra n s m is s io n : Be su r e key
ca n n ot be r em oved u n t il r elea se lever is oper a t ed. If
key ca n be r em oved, r elea se lever m ech a n ism m a y be
defect ive. Relea se lever m ech a n ism is n ot ser viced
sepa r a t ely. If r epa ir is n ecessa r y, t h e st eer in g colu m n
m u st be r epla ced. Refer t o Gr ou p 19, St eer in g for
pr ocedu r es.
(5) Con n ect n ega t ive ca ble t o ba t t er y.
(6) Ch eck elect r ica l oper a t ion of swit ch .
SHIFTER/IGNITION INTERLOCK
On m odels equ ipped wit h a n a u t om a t ic t r a n sm is-
sion , a ca ble con n ect s t h e ign it ion swit ch wit h t h e
floor sh ift lever. Th e sh ift er will be locked in t h e
PARK posit ion wh en t h e ign it ion key is in t h e LOCK
or ACCE SSORY posit ion s. Th e ca ble ca n be a dju st ed
or r epla ced. Refer t o Gr ou p 21, Tr a n sm ission s for
pr ocedu r es. Th e ign it ion in t er lock device wit h in t h e
st eer in g colu m n is n ot ser vicea ble. If ser vice is n ec-
essa r y, t h e st eer in g colu m n m u st be r epla ced. Refer
t o Gr ou p 19, St eer in g for pr ocedu r es.
SPECI FI CAT I ON S

IGNITION TIMING

Ign it ion t im in g is n ot a dju st a ble on a n y en gin e.
Refer t o Ign it ion Tim in g in t h e Dia gn ost ics/Ser vice
P r ocedu r es sect ion of t h is gr ou p for m or e in for m a -
t ion .
ENGINE FIRING ORDER—2.5L 4-CYLINDER

ENGINE

ENGINE FIRING ORDER—4.0L 6-CYLINDER
ENGINE

SPARK PLUGS

ENGINE PLUG TYPE
2.5L/4.0L RC12ECC
SPARK PLUG CABLE RESISTANCE
MINIMUM
250 Ohms Per Inch
3000 Ohms Per Foot
X J
ELECTRODE GAP
0.89 mm (0.035 in.)
MAXIMUM
1000 Ohms Per Inch
12,000 Ohms Per Foot