Chevrolet Corvette 1963 Repair & Tune-Up Manual page 305

284 TROUBLESHOOTING
Test and Procedure
4.4—Check the coil secondary resis-
tance: On point-type systems con-
nect an ohmmeter across the dis-
tributor side of the coil and the coil
tower. Read the resistance on the
high scale of -the ohmmeter. On
electronic ignition systems, see
Chapter 3 for specific tests.
4.5—Visually inspect the spark plug
wires for cracking or brittleness.
Ensure that no two wires are posi-
tioned so as to cause induction fir-
ing (adjacent and parallel). Re-
move each wire, one by one, and
check resistance with an ohmme-
ter.
Misfiring can be the result of
spark plug leads to adjacent,
consecutively firing cylinders
running parallel and too close
together
4.6—-Remove the spark plugs, noting the
cylinders from which they were re-
moved, and evaluate according to
the color photos in the middle of
this book.
Results and Indications
The resistance of a satisfactory coil should be
between 4,000 and 10,000 ohms; If resistance
is considerably higher (i.e., 40,000 ohms) re-
place the coil and retest per 4.1. NOTE: This
does not apply to high performance coils.
Testing the coll secondary resistance
Replace any cracked or brittle wires. If any of
the wires are defective, replace the entire
set. Replace any wires with excessive resis-
tance (over 8000 fi per foot for suppression
wire), and separate any wires that might
cause induction firing.
SPARK PLUG WIRE
On point-type Ignition systems,
OHMMETER
check the spark plug wires as
shown. On electronic Ignitions,
do not remove the wire from the
distributor cap terminal; Instead,
test through the cap
See following.
Proceed
Spark plug wires can be checked
CRACKS
visually by bending them In a
loop over your finger. This will
reveal any cracks, burned or
broken Insulation. Any wire with
cracked Insulation should be re-
placed
See
following.
to
4.6