Mitsubishi Eclipse. Manual — part 675
IGNITION SYSTEM
TSB Revision
ENGINE ELECTRICAL
16-43
Number of vibrations at beginning of dwell section (Refer to
Abnormal Waveform Example 5)
Point D:
Ignition voltage height (distribution per each cylinder) shows
the following trends.
.
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.
NUMBER OF VIBRATIONS
COIL
5
− 6 or higher
Normal
Except above
Abnormal
IGNITION
VOLTAGE
PLUG
GAP
CONDITION
OF
ELECTRODE
COMPRESSION
FORCE
CONCENTRATION
OF AIR MIXTURE
IGNITION
TIMING
SPARK PLUG
CABLE
High
Large
Large wear
High
Lean
Retarded
High resistance
Low
Small
Normal
Low
Rich
Advanced Leak
AKX00280
AKX00281
AKX00282
IGNITION SYSTEM
TSB Revision
ENGINE ELECTRICAL
16-44
Example 4
• Wave characteristics
Spark line is high and short. Difficult to distinguish between
this and abnormal wave pattern example 1.
• Cause of problem
Spark plug cable is not properly connected. (Causing a dual
ignition)
Example 5
• Wave characteristics
No waves in wave damping section
• Cause of problem
Layer short in ignition coil.
<3.0L ENGINE>
.
MEASUREMENT METHOD
1. Clamp the spark plug cable of the number 1 cylinder with the
secondary pickup and check the wave patterns for each
cylinder.
2. Connect the secondary pickup to the other cylinder in turn
and check the wave patterns for each cylinder.
.
STANDARD WAVE PATTERN
AKX00283
AKX00284
Observation Conditions
FUNCTION
SECONDARY
Pattern height
High (or low)
Pattern selector
Raster
Engine speed
Curb idle speed
IGNITION SYSTEM
TSB Revision
ENGINE ELECTRICAL
16-45
.
WAVEFORM OBSERVATION POINTS
NOTE: Abnormal waveform examples are shown subse-
quently.
Point A:
The height, length and slope of the spark line (refer to
abnormal waveform examples 1, 2, 3 and 4) show the fol-
lowing trends.
AKX00278
kV
0
SECONDARY
IGNITION
VOLTAGE
WAVE PATTERN
IGNITION VOLTAGE
(POINT D)
SPARK LINE (POINT A)
DWELL SECTION
WAVE DAMPING REDUCTION SECTION (POINT B)
POINT C
TIME
AB
SPARK LINE
PLUG
GAP
CONDITION
OF
ELECTRODE
COMPRESSION
FORCE
CONCENTRATION
OF AIR MIXTURE
IGNITION
TIMING
SPARK
PLUG
CABLE
Length Long
Small
Normal
Low
Rich
Advanced
Leak
Length Short
Large
Large wear
High
Lean
Retarded
High
resistance
Height High
Large
Large wear
High
Lean
Retarded
High
resistance
Height Low
Small
Normal
Low
Rich
Advanced
Leak
Slope
Large
Plug is fouled −
−
−
−
IGNITION SYSTEM
TSB Revision
ENGINE ELECTRICAL
16-46
Point B:
Number of vibrations in reduction vibration section (Refer to
Abnormal Waveform Example 5)
Point C:
Number of vibrations at beginning of dwell section (Refer to
Abnormal Waveform Example 5)
Point D:
Ignition voltage height (distribution per each cylinder) shows
the following trends.
.
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.
NUMBER OF VIBRATIONS
COIL AND CAPACITOR
Three or more
Normal
Except above
Abnormal
NUMBER OF VIBRATIONS
COIL
5
− 6 or higher
Normal
Except above
Abnormal
IGNITION
VOLTAGE
PLUG
GAP
CONDITION
OF
ELECTRODE
COMPRESSION
FORCE
CONCENTRATION
OF AIR MIXTURE
IGNITION
TIMING
SPARK PLUG
CABLE
High
Large
Large wear
High
Lean
Retarded
High resistance
Low
Small
Normal
Low
Rich
Advanced Leak
AKX00280
AKX00281
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст