Spark Plugs - Chevrolet Spark Owner's Manual

7–18 SERVICE AND VEHICLE CARE

SPARK PLUGS

IGNITION SYSTEM
WARNING
Electric ignition systems have greater
voltage than conventional systems.
• Do not touch components of ignition
system. Touching ignition system
components could cause shock or
electrocution, resulting in serious
injuries.
If you experience reduced performance or
fuel economy, follow the procedure to in-
spect and clean spark plugs.
CAUTION
Spark plugs can become extremely hot
and could cause serious injury.
• Do not handle hot spark plugs.
INSPECTING AND REPLACING SPARK
PLUGS
1. Once the engine has cooled to the
touch, disconnect the spark plug wire
by pulling on the boot, not the cable.
2. Use a 21 mm spark plug socket and
remove the spark plugs from the engine.
Be sure contaminants not to enter the
spark plug hole.
3. Inspect the spark plugs for broken in-
sulator. Replace the plug if the insula-
tor is cracked or broken. Otherwise,
wipe the insulator clean.
4. Using a very fine wire brush, clean the
upper contact tip and electrode. After
cleaning, adjust the gap to the specifi-
cation.
See "VEHICLE SPECIFICATIONS" on
page 9-6 for the spark plug specifica-
tion.
5. Install each spark plug by hand as far
as it will go.
NOTE
When replacing new spark plugs, the
entire set should be replaced at a time.
6. Torque each spark plug.
7. Fasten the spark plug wire terminal
squarely and firmly over the end of each
spark plug until you feel it snap into
place. Make sure the spark plug wires
are in the correct order.
S3W1180A