Isuzu 1999 RODEO Workshop Manual page 611

6D2–2 IGNITION SYSTEM (X22SE 2.2L)
Removal
1. Disconnect battery ground cable.
2. Ignition module connector.
3. Removal ignition module (1).
Removal
1. Remove spark plugs.
Inspection and Repair
The spark plug affects entire engine performance and
therefore its inspection is very important.
f Check electrode and insulator for presence of
cracks,and replace if any.
f Check electrode for wear,and replace if necessary.
f Check gasket for damage,and replace if necessary.
f Measure insulation resistance with an ohmmeter,and
replace if faulty.
f Adjust spark plug gap to 0.7 mm (0.027 in) ∼ 0.8 mm
(0.031 in).
f Check fuel and electrical systems if spark plug is
extremely dirty.
f Use spark plugs having low heat value (hot type plug)
if fuel and electrical systems are normal.
f Use spark plugs having high heat value (cold type
plug) if insulator and electrode are extremely burned.
Ignition Module
Installation
1. Install the ignition module (1).
Connect ignition module connector and ignition
coil,then tighten bolt to the specified torque.
Torque: 20 N·m (15 lb ft)
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2. Connect battery ground cable.
Spark Plug
Sooty Spark Plugs
Much deposit of carbon or oil on the electrode and
insulator of spark plug reduces the engine performance.
Possible causes:
f Too rich mixture
f Presence of oil in combustion chamber
f Incorrectly adjusted spark plug gap
Burning Electrodes
This fault is characterized by scorched or heavily oxidized
electrode or blistered insulator nose.
Possible causes:
f Too lean mixture
f Improper heat value
Measuring Insulation Resistance
f Measure insulation resistance using a 500 volt
megaohm meter.
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