Pontiac Grand Prix Service Manual page 399

ENGINE ELECTRICAL 6E-23
of ways such as wasting gas, power loss, loss of speed,
trode which extends through porcelain center. Always make
hard starting and general poor engine performance.
adjustments by bending ground (side) eIec~rode.
Spark plug failure, in addition to normal wear may be
due to dirty or leaded plugs, excessive gap or broken
insulator.
CLEAN AND REGAP
Clean spark plugs thoroughly using an abrasive-type
cleaner. All spark plugs must be of the same make and
number or heat range. Use a round feeler gauge to
adjust the spark plug gaps to .035" (Fig. 6E-36).
INSTALL
I . Inspect s
k. plug hole threads and clean before
installing pugs.
P"
Corrosion deposits can be removed
with a 14 mm.
x
1 . 2 5 SAE spark plug tap (available
through local 'jobbers) or by using a small, soft wire
brush in an electric drill. If a tap is used, coat it with
plenty of grease to catch any chips.
CA UTION: Use extreme care when using tap to prevent
cross threading. AAo, crank engine several times to blow
out
any
material dislodged during cleaning operation.
CAUTZON: Before adjusting gap, file center electrode
2. Install spark plugs in engine, using new gaskets, and
flat. In adjuting spark plug gap, never bend center elec-
tighten to 23 lb. ft. torque.