Mitsubishi Galant. Manual — part 355
IGNITION SYSTEM
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ENGINE ELECTRICAL
16-46
ABNORMAL WAVEFORMS EXAMPLES
Example 1
•
Wave characteristics
Spark line is high and short.
•
Cause of problem
Spark plug gap is too large.
Example 2
•
Wave characteristics
Spark line is low and long, and is sloping.
Also, the second half of the spark line is distorted. This
could be a result of misfiring.
•
Cause of problem
Spark plug gap is too small.
Example 3
•
Wave characteristics
Spark line is low and long, and is sloping. However,
there is almost no spark line distortion.
•
Cause of problem
Spark plug gap is fouled.
Example 4
•
Wave characteristics
Spark line is high and short
•
Cause of problem
Spark plug cable is not properly connected. (Causing a
dual ignition)
HEIGHT OF ZENER
VOLTAGE
PROBABLE CAUSE
High
Problem in zener diode
Low
Abnormal resistance in
primary coil circuit
AKX00288
AKX00289
AKX00290
AKX00291
IGNITION SYSTEM
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ENGINE ELECTRICAL
16-47
Example 5
•
Wave characteristics
No waves in wave damping section
•
Cause of problem
Layer short in ignition coil.
IGNITION COIL
REMOVAL AND INSTALLATION <2.4L ENGINE>
M1163004000040
DISTRIBUTOR ASSEMBLY
REMOVAL AND INSTALLATION <3.0L ENGINE>
M1163002000055
AKX00292
AC000288
1
2
3
1
2
4
9.8 N·m
87 in-lb
9.8 N·m
87 in-lb
4.9 N·m
43 in-lb
25 N·m
18 ft-lb
AC
REMOVAL STEPS
1.
SPARK PLUG CABLE
2.
IGNITION COIL ASSEMBLY
3.
SPARK PLUG
4.
IGNITION FAILURE SENSOR
ASSEMBLY
REMOVAL STEPS (Continued)
Pre-removal Operation
•
Air Cleaner Removal (Refer to GROUP 15
−
Air Cleaner
.)
Post-installation Operation
•
Air Cleaner Installation (Refer to GROUP 15
−
Air Cleaner
.)
•
Ignition Timing Check (Refer to GROUP 11C, On-vehicle
Service
−
IGNITION SYSTEM
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ENGINE ELECTRICAL
16-48
INSTALLATION SERVICE POINT
>>A<< DISTRIBUTOR INSTALLATION
1. Set the number 1 cylinder to top dead compression center.
2. Align the mating marks on the distributor housing and
coupling, and then install the distributor to the engine.
3. Check that the ignition timing is at the standard value. (Refer
to GROUP 11C, On-vehicle-Service - Ignition Timing Check
AC000289AC
1
2
4
5
2
3
4
5
12 N·m
106 in-lb
25 N·m
18 ft-lb
25 N·m
18 ft-lb
N
N
REMOVAL STEPS
1.
DISTRIBUTOR CONNECTOR
2.
SPARK PLUG CABLE
CONNECTION
>>A<<
3.
DISTRIBUTOR
•
INTAKE MANIFOLD PLENUM
(REFER TO GROUP 15
−
INTAKE
MANIFOLD PLENUM
4.
SPARK PLUG CABLE
5.
SPARK PLUG
REMOVAL STEPS (Continued)
AC000290 AB
MATING
MARKS
IGNITION SYSTEM
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ENGINE ELECTRICAL
16-49
DISASSEMBLY AND ASSEMBLY
M1163002200059
CAMSHAFT POSITION SENSOR
REMOVAL AND INSTALLATION <2.4L ENGINE>
M1163003400089
AK000203AC
1
2
3
4
5
2.3 – 0.7 N•m
20 – 6 in-lb
DISASSEMBLY STEPS
1.
DISTRIBUTOR CAP
2.
ROTOR
3.
PACKING
4.
DISTRIBUTOR HOUSING
5.
O-RING
DISASSEMBLY STEPS
AC000291
CAMSHAFT POSITION
SENSOR
8.8 N·m
78 in-lb
N
AC
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