
to take place gradually and avoid plug destroying
splash fouling shortly after the plug change.
ELECTRODE GAP BRIDGING
Loose deposits in the combustion chamber can
cause electrode gap bridging. The deposits accumu-
late on the spark plugs during continuous stop-
and-go
driving.
When
the
engine
is
suddenly
subjected to a high torque load, the deposits partially
liquefy and bridge the gap between the electrodes
(Fig. 26). This short circuits the electrodes. Spark
plugs
with
electrode
gap
bridging
can
be
cleaned and reused.
SCAVENGER DEPOSITS
Fuel scavenger deposits may be either white or yel-
low (Fig. 27). They may appear to be harmful, but
are a normal condition caused by chemical additives
in certain fuels. These additives are designed to
change the chemical nature of deposits and decrease
spark plug misfire tendencies. Notice that accumula-
tion on the ground electrode and shell area may be
heavy but the deposits are easily removed. Spark
plugs with scavenger deposits can be consid-
ered normal in condition, cleaned and reused.
CHIPPED ELECTRODE INSULATOR
A chipped electrode insulator usually results from
bending the center electrode while adjusting the
spark plug electrode gap. Under certain conditions,
severe detonation also can separate the insulator
from the center electrode (Fig. 28). Spark plugs
with
chipped
electrode
insulators
must
be
replaced.
PREIGNITION DAMAGE
Excessive combustion chamber temperature can
cause preignition damage. First, the center electrode
dissolves and the ground electrode dissolves some-
what later (Fig. 29). Insulators appear relatively
deposit free. Determine if the spark plugs are the
correct type, as specified on the VECI label, or if
other operating conditions are causing engine over-
heating.
Fig. 26 Electrode Gap Bridging
GROUND
ELECTRODE
DEPOSITS
CENTER
ELECTRODE
Fig. 27 Scavenger Deposits
GROUND ELECTRODE COV-
ERED WITH WHITE OR YEL-
LOW DEPOSITS
CENTER
ELEC-
TRODE
Fig. 28 Chipped Electrode Insulator
GROUND
ELECTRODE
CENTER
ELECTRODE
CHIPPED
INSULATOR
Fig. 29 Preignition Damage
GROUND
ELECTRODE
STARTING TO
DISSOLVE
CENTER
ELECTRODE
DISSOLVED
8D - 14
IGNITION SYSTEM
JX
DIAGNOSIS AND TESTING (Continued)
Summary of Contents for 1997 Stratus Convertible LHD
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Page 913: ...Fuel Line Adapter 1 4 JX FUEL SYSTEM 14 59 SPECIAL TOOLS Continued ...
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Page 1033: ...41TE TRANSAXLE HYDRAULIC SCHEMATIC JX TRANSAXLE 21 65 SCHEMATICS AND DIAGRAMS Continued ...
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