If it is felt that the ignition mag/module may be faulty, perform the fol-
lowing tests before replacing the ignition supply. Verify that the ignition
wiring and all connections relating to the ignition system are in good
condition. With solid state systems, also verify incoming signals and
D.C. power to the module are correct. (See D.C. Power)
Partial shorts in the wiring harness upstream or downstream of the test
point would result in lower than expected readings as the current intend-
ed for the ignition coil would now have an easier path to ground. (Zero
if fully shorted.)
Resistance in the wiring harness upstream of the test point would result
in lower than expected readings as current flow to the ignition coil is
restricted.(This reading would be zero if the circuit was fully open as
there is no path for current flow to the tester.)
Resistance in the wiring harness downstream of the test point would
result in very high readings as the current is trying to return to ground
through the high impedance of the ACCUTEK III.
Section 12
Missing Pulse
MULTI-STRIKE IGNITION SYSTEMS MUST BE
OPERATED IN SINGLE STRIKE MODE WHEN
TESTING WITH THE ACCUTEK III.
The ACCUTEK III has the ability to anticipate firing events on an
engine operating at a relatively constant R.P.M. This is very useful in
determining if an intermittent engine miss is being caused by a problem
with the ignition system. Should the ignition system fail to deliver a fir-
ing pulse to an ignition coil, at the anticipated interval, the engine will
misfire. The ACCUTEK III will alert you by illuminating the Missing
Pulse L.E.D.* and increment the count on the LCD. The ACCUTEK III
can be connected to the primary lead of the cylinder where the misfires
are occurring. This connection should be made as close to the ignition
coil as possible.
* The missing pulse LED is located to the right of the LCD display.
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