Advertisement
2. Connect a ground probe to the engine .
(The probe can be made by attaching one end
of a 3-foot insulated wire to a screwdriver
blade and the other end to a suitable engine
ground .)
3 . Start the engine and let it idle at the hot
rpm specification .
4. Use a water spray bottle (household
cleaning solution bottle with manual spray
pump) to wet the insulation, simulating the
conditions it might encounter in wet weather
driving.
5. Starting at either end of the suspect
wire, thoroughly trace the insulation of the
wire, boot and nipple, observing for spark
jumping through the insulation to the test
probe.
6. Use particular care to probe the under-
side and lower edges of the spark plug boot.
Also, carefully probe the joint areas where the
wire enters the boot and nipple .
7. Test the suspect wire(s) for internal
conductor damage using the ohmmeter pro-
cedure described previously .
It is recommended that the aforementioned
procedure be performed in subdued light .
It
should be noted, however, that a faint arcing
or "corona . p henomena" (a faint glow adjacent
to the surface of an electrical conductor at
high voltage) will always be present in various
degrees of intensity, dependent on humidity
and lighting conditions . This condition is not
usually
indicative , of
enough
leakage
to
produce the subject complaint unless the
engine falters noticeably .
If a strong arc or any opening in the in-
sulation of wire, boot or nipple is observed and
the engine falters noticeably, the wire(s)
should be replaced .
CAUTIOhk
Plug wires are damaged
by Refrigerant-12 .
When charging air
conditioning, avoid Refrigerant-12 con-
tact with spark plug wires.
If air
conditioning system has had a leakage
failure, check spark plug wires as des-
cribed above .
SPARK PLUGS
Note revised spark plug firing order for 455
cubic inch engine with high energy ignition
system (figure 4A).
DIAGNOSING HIGH ENERGY
SYSTEM
If engine will not start, perform this on-
vehicle test of the ignition system BEFORE
ENGINE EL ECTRI CA L 6Y-11
4 IN
"y==== ~y oaaaw; .ao waav v
\\\\\\`
Figure 4A-Secondary Wiring
checking HEI module with tester J-24642 :
1 . Insure that wiring connector is properly
attached to connector at side of distributor.
2 . Check that all spark plug leads are
properly connected at distributor and spark
plugs .
3 . Connect voltmeter or test light from
"BAT" terminal lead on distributor to ground
(figure 5) .
4. Turn on ignition switch. If voltage is zero
or test light does not come on, repair open
circuit between "BAT" terminal and battery.
5. When reading is battery voltage, or test
light lights, remove one spark plug lead by
twisting spark plug boot to loosen . Insert
extension, hold spark plug lead with insulated
pliers so extension is 1/4" away from dry area
of engine block while cranking engine, or
IGNITION
WIRE TERMINALS
TACHOMETER
WIRE TERMINALS
(DO NOT GROUND)
A-4004
Figure 5-Terminals on Distributor Cap
16181
Advertisement
