..
03-078-1 0
Ignition, Electronic-4.6L (2V)
CLEANING AND INSPECTION (Continued)
Spark Plug Inspection Chart
GAP BRIDGED
IDENTIFIED BY DEPOSIT BUILD
UP CLOSING GAP BETWEEN
ELECTRODES.
CAUSED BY OIL OR CARBON
FOULING. CLEAN SPARK PLUG.
CARBON FOULED
IDENTIFIED BY BLACK, DRY FLUFFY
CARBON DEPOSITS ON INSULATOR
TIPS, EXPOSED SHELL SURFACES
AND ELECTRODES.
CAUSED BY TOO COLD A PLUG,
DIRTY AIR CLEANER, DAMAGED
FUEL PUMP, TOO RICH A FUEL
MIXTURE OR EXCESSIVE IDLING.
CLEAN SPARK PLUG.
OYERHEAnNG
NORMAL
IDENTIFIED BY LIGHT TAN OR GRAY
DEPOSITS ON THE FIRING TIP.
03-078-10
OIL FOULED
IDENTIFIED BY WET BLACK
DEPOSITS ON THE INSULATOR
SHELL BORE ELECTRODES.
CAUSED BY EXCESSIVE OIL
ENTERING COMBUSTION CHAMBER
THROUGH WORN RINGS AND
PISTONS, EXCESSIVE CLEARANCE
BETWEEN VALVE GUIDES AND
STEMS, OR WORN OR LOOSE
BEARINGS. CORRECT OIL
PROBLEM. REPLACE SPARK PLUG.
PRE-IGNITION
IDENTIFIED BY MEL TED ELECTRODES
AND POSSIBLY BLISTERED INSULATOR.
METALLIC DEPOSITS ON INSULATOR
INDICATE ENGINE DAMAGE.
FUSED SPOT DEPOSIT
IDENTIFIED BY MEL TED OR SPOTTY
DEPOSITS RESEMBLING BUBBLES OR
BLISTERS.
CAUSED BY SUDDEN ACCELERATION.
CLEAN SPARK PLUG.
1997
Thunderbird, Cougar July
1996