Launch X-431 PAD V User Manual page 94

LAUNCH
Combustion line:
Observe the spark or the combustion line which shall be clean with
few clutter, as lots of clutter indicates the cylinder has poor ignition
due to ignite too early, damaged nozzle, pollutant spark plug, or other
reasons. The duration of combustion line indicates the mixing ratio of
the cylinder is abnormal lean or rich. Too long combustion line (usually
greater than 2ms) represents the mixing ratio is rich, whereas too
short of combustion line (usually less than 0.75ms) represents the
mixing ratio is lean.
Ignition coil oscillation:
Observe at least two oscillation waveforms after the combustion
line, which will be better if more than three oscillation waveforms, as
it represents the ignition coil and capacitor (on Platinum or ignition
system) are normal.
Primary voltage analysis
According to the faulty primary voltage waveform collected by the
ignition analysis, the related components and mechanical equipment
status of ignition system electrical circuit can be analyzed, which
provides a reliable basis for the adjustment and maintenance of power
circuit to avoid the blind demolition.
The waveform shown on Fig. IA-4, appears a lot of clutter on the
contact break point, which is obviously caused by the serious erosion
on contact break point. It can be verifi ed via burnishing the contact or
changing the circuit breaker.
90
For the primary voltage waveform shown on IA-5, the damped
attenuation cycles obviously reduced on the spark period, the
amplitude became lower, which is evidently caused by capacitor
leakage.
The waveform on IA-6 shows the accidental pumping during contact
closing period. The irregular beating is caused by insuffi cient spring
force.
The curve on IA-7 shows the contact angle is too small during the
magnetizing period, which is caused by too large contact gap.
A lot of clutter will be displayed on the horizontal section of primary
waveform if contact has poor grounding, as shown below IA-8.
User's Manual
PAD V
IA-4
IA-5
IA-6
IA-7