compression ratio MITSUBISHI 3000GT 1992 2.G Workshop Manual

Downloaded from www.Manualslib.com manuals search engine ENGINE ELECTRICAL - Ignition System16-39
Wave-form Observation PointsPoint A: The height, length and
slope~of the spark line (refer to abnormal wave-form examples 1, 2, 3
and 4) show the following ‘trends.’\
Spark linePlug gapCondition of Compression Concentration
electrode
forceIgnition timing Sparkof air mixture
plug cable
LengthLongSmallNormal.
LowRichAdvancedLeak
ShortLarge
Large wear
HighLeanRetardedHigh
resistance
Height
HighLargeLarge wearHighLeanRetardedHigh
resistance
LowSmallNormal
Low
Rich _AdvancedLeak
SlopeLargePlug is fouled
-
Point B: Number of vibrations in reduction vibration section (Refer to abnormal wave-form example 5)
Point C: Number of vibrations at beginning of dwell section (Refer to abnormal wave-form example 5)
Point D: Ignition voltage height (distribution per each cylinder) shows the following trends.
Ignition
voltagePlug gapCondition of CompressionConcentration
electrodeIgnition timing Spark
forceof air mixtureplugcable
HighLarge
Large wearHighLean
RetardedHigh
resistance
LowSmallNormal
LowRich
AdvancedLeak
TSB Revision

Downloaded from www.Manualslib.com manuals search engine ENGINE ELECTRICAL - Ignition System16-43
Wave-form Observation Points/
LPoint A: The height, length and slope of the spark line (refer to abnormal wave-form examples 1, 2, 3and 4) show the following trends.
Spark linePlug gapCondition of CompressionConcentra-Ignition timing High tension
electrodeforcetion of air mix-cable
tureLength Long
SmallNormalLowRichAdvanced
Leak
Short
LargeLarge wearHighLeanRetardedHigh
resistanceHeight High
LargeLarge wearHighLeanRetardedHigh
resistance
LowSmall
NormalLowRichAdvancedLeak
SlopeLargePlug is fouled-
Point B: Number of vibrations in reduction vibration section
(Refer to abnormal wave-form example 5)
Number of vibrationsCoil and condenser
I3 or higher/ Normal
Except aboveAbnormal
Point C: Height of Zener voltage
Height of Zener voltageProbable cause
HigherProblem in Zener diode
LowerAbnormal resistance in pri-
mary coil circuit
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Downloaded from www.Manualslib.com manuals search engine 16-46ENGINE ELECTRICAL - Ignition Svstem
27ELOO95JINSTALLATION SERVICE POINTS.A+CRANKSHAFT
POSITION SENSOR INSTALLATION

(1) Turn the crankshaft so that the No. 1 cylinder is at
compression top dead center.
Caution
Be careful not to turn it to the No.
4 cylinder com-
pression top dead center by mistake.
(2) Install, lining up the matchmarks on the crankshaft
position sensor housing and the coupling.
,B+SPARK PLUG CABLE INSTALLATION
Improper arrangement of spark plug cables will induce
voltage between the cables, causing miss firing and devel-
oping a surge at acceleration in high-speed operation.
Therefore, be careful to arrange the spark plug cables
properly by the following procedure.
1.install the spark plug cable clamps as shown in the
illustration.
2.The numerals on the support and clamp indicate the
spark plug cable No.
3.Pay attention to the following items when the spark
plug cables are installed.
(1)Install the cables securely to avoid possible contact
with metal parts.(2) Install the cables neatly, ensuring they are not
too tight, loose, twisted or kinked.
/ TSB Revision