JAC J2 - Page 137



Maintenance Manual for J2 Sedan
Electrical Part of Engine
136
③

Remove
high-voltage
ignition c
oil bol
t to
remove coil.
■
Tightening torque: 6-8N·m
④

Dismount
the
spark
plug
with
special
socket.
Tightening torque: 25-30N·m
Attention:
■
Please
do
not
drop
or
shake
it.

2) Check after
dismantlement
①

High-voltage
ignition
coil
■
Check
the
primary
coil
resistance
between
both
terminals.
Primary coil resistance: 0.77-0.95 Ω
■
Check
the
resistance
of
secondary
coil
Secondary coil resistance: 7.75-10.23 KΩ
Attention:
■
The ignitio
n coil
harness
connector
must be
disconnected for
secondary
coil
resistance
measurement.
②
 Spark plug
Check the spark plug:
■
Check
insulator
of
spark
plug
for
damage
and
broken.
■
Check
spark plu
g for ca
rbon de
posit. S
ee th
e followi
ng table
for cause
s of c
arbon d
eposit.
Causes of Carbon Deposit
Phenomenon
Black
charcoal
Hard
charcoal
Reason
Impurity
in
the
fuel
or
high
fuel-air
ratio.
Impurities in the fuel; wrong
ignition timing, or untight spark
plug.
■
Check
spark
plug
electrodes
for
damage.
■ Inspect
clearance
of
spark
plug.
Fig. 3.1.002