Chevrolet Corvette 1963 Repair & Tune-Up Manual page 304

Section 4—Secondary Electrical System
Test'and Procedure
4.1 —Check for spark: Hold each spark
plug wire approximately %" from
ground with gloves or a heavy, dry
rag. Crank the engine, and ob-
serve the spark.
Check for spark at the plugs
4.2—Check for spark at the coil high
tension lead: Remove the coil high
tension lead from the distributor
and position it approximately Vi"
from ground. Crank the engine
and observe spark. CAUTION:
This test should not be performed
on engines equipped with elec-
tronic ignition.
4.3—Visually inspect the distributor
cap and rotor for burned or cor-
roded contacts, cracks, carbon
tracks, or moisture. Also check the
fit of the rotor on the distributor
shaft (where applicable).
CORRODED OR
LOOSE WIRE
HIGH RESISTANCE
CARBON
ROTOR TIP
BURNED AWAY
Inspect the distributor cap and rotor
See Chapters 2-3 for service" procedures
Results and Indications
If no spark is evident:
If spark is good in some cylinders:
If spark is good in all cylinders:
If the spark is good and consistent:
If the spark is good but intermittent, test the
primary electrical system starting at 3.3:
If the spark is weak or non-existent, replace
the coil high tension lead, clean and tighten
all connections and retest. If no improvement
is noted:
If moisture is present, dry thoroughly, and
retest per 4.1:
If burned
cracks, or carbon tracks are noted, replace
the defective part(s) and retest per 4.1:
If the rotor and cap appear intact, or are only
slightly corroded, clean the contacts thor
oughly (including the cap towers and spark
plug wire ends) and retest per 4.1:
If the spark is good in all cases:
If the spark is poor in all cases:
\
TROUBLESHOOTING
or excessively corroded
283
Proceed
to
4.2 4.3
4.6
4.3
3.3
4.4
4.1
contacts,
4.1
4.6
4.5