Gxt V055-01 Diagnostic Analyzer Manuel d'utilisateur télécharger pdf (Page 10)

The EngineLink will analyze the ignition and determine

the polarity of each of the KV clips. When complete,

a screen will advise that the throttle should be opened

abruptly. This sets the minimum and maximum readings.

The composite screen will appear, showing the average

readings for all coils.

SPARK BURN DURATION

The spark burn duration on a DIS is usually between 0.5

and 1.5 mSec. Long burn duration comes from narrow

or fouled plug gaps, insulation shorts, low cylinder

compression, and rich fuel mixtures. Short burn duration

is caused by breaks in ignition secondary wires, wide

spark plug gaps, worn plugs, high circuit resistance, and

very lean fuel mixtures.

A reduction in burn durations, with snap acceleration, is

an ideal check for spark plug gaps that have the sharp

edges worn off, and to see that insulation does not arc

through.

Problems like wire breaks and high secondary resistance

are most easily detected at a moderate and steady RPM

between 1000 and 2000.

FIRING KV — Live and Maximum

Firing KV is the voltage that is required to start ionizing

the air/fuel mix in the spark plug gap. For the ignition

to always work, the KV available from the coil must be

more than the highest KV requirement. Causes of high

KV can be a wide or worn plug gap, a broken sparkwire conductor, or a lean fuel mixture. Unusually low

KV can be from a fouled plug gap, secondary insulation failure, or low compression. Typical live KV is 5

to 10 at a steady RPM with not more than a 5 KV difference between the highest and lowest.

EXHAUST KV

Also known as waste KV. On double output coils, the spark plug in the cylinder on its exhaust stroke

serves as the ground path for the coil. Exhaust KV should be low because, without compression in the

cylinder, little voltage should be needed to ﬁre the plug. Exhaust spark is normally less than 5 KV. Higher

readings indicate the possibility of a broken spark plug wire, a wide plug gap, or a fouled plug on the

opposite side.

INDIVIDUAL CYLINDER READINGS

Use the up and down arrows to see four additional screens that show data for the individual cylinders.

The burn time bar graph screen shows live spark burn time for each cylinder. The number in the upper

left corner shows the average for all cylinders. Press HELP to see an explanation of the screen. The burn

time numerical screen shows min., max., and live spark burn time for each cylinder in numerical format.

The KV bar graph screen shows live KiloVolt readings for each cylinder. The bottom of the left bar

represents the minimum kilovolts and the top is the maximum. The top of the middle bar shows the live

reading for ﬁring KV and the right bar shows exhaust KV.

Ignition Secondary - DIS

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 27 28

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Gxt V055-01 Diagnostic Analyzer Manuel d'utilisateur Page 10

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