Buick spare parts NGK Iridium Spark plug ITR4A-15 for buick
lacrosse same to DENSO VT16 HR9KII33 Y
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|Electrode Gap [mm]||1,5|
|Tightening Torque [Nm]||20|
|Tightening angle [degrees]||15|
|Outer Thread [mm]||14|
|Thread Pitch [mm]||1,25|
|Thread Length [mm]||17,5|
|Spark Position [mm]||4|
|Number of Poles||1|
|BUICK||12 568 387|
|CADILLAC||12 568 387|
|CHEVROLET||12 568 387|
|DAEWOO||12 568 387|
|PONTIAC||12 568 387|
SPARK PLUG OUTLINE ANALYSIS AFTER USE
Insulator skirt side was”blach white”shaped electrode ablation
prematurely. Because premature ignition timing,cooling system
adverse; using a low-grade gasoline, mixture too lean; spark plug
into the combustion chamber and spark plug heat value too low;
spark plug installation torque is not enough, the outer seal leak
End of the spark plug insulator skirt cracking or breakage.The use
of low-grade gasoline or cause premature ignition timing.
Hulled face screwed around and luminal surface portion of the
insulator and the electrode surface adhesion side skirts with black
wet shiny oil.Mainly piston rings, cyclinder wear and tear to
because improper carbutetor adjustment
End of the spark plug insulator skirt was brown, brown or light
gray, electrode erosion is very small, indicating that the spark
plugs and the engine is matched
Too much coke
Side electrode and insulator attached to a thick layer of yellow
skirt powder, is due to the use of leaded fuel additives caused
Melting electrode, the center electrode and the side electrode of
the port portion into a molten state. Because premature ignition
timing, cooling system adverse; using low-grade gasoline, mixture
too lean; spark plug into the combustion chamber and spark plug
heat value too low; spark plug installation torque is not enough,
the outer seal leak worse
Screwed steel face and cavity surface portion of the insulator side
skirts and black carbon electrode surface is covered by sediments,
causing severe spark plug flameout. Mainly due to the mixture is
too thick, clogged air filter, choke improper use; excessive oil
consumption, ignition time lag; prolonged low speed and the use of
high heat value of the spark plug.
Insulator skirt side white powder or yellow,brown, green, and black
lead color. Since tetraethyl lead in gasoline at low engine load
operation of the skirt adhered to the end surface of the insulator,
when the engine speed, high speed, full load operation, the
temperature increases further, the spark plug insulator formed on
the surface of the conductive lead compound due to temperature
increased with the increase, eventually leading to fire the spark
Porcelain surface axially obvious traces the arc burning sparkle.
Is due to prolonged use spark plug electrode burning, the gap is
too large, high-voltage insulator jacket poor performance, aging;
porcelain high-voltage lines and the gap is too large.
Mounting torque is too small
Deformation of the outer washer inadequate leak, resulting in
insufficient cooling spark plugs. Spark plug could easily lead to
overheating and even pillow melting electrode, porcelain skirt
On the insulator layer of yellow scale. 2 is due to air under high
voltage to 30000 volts is ionized impurities in the air is formed
on the insulator attached
Electrode and insulator skirt severely deformed damaged, is due to
incorrect use spark plug model, and the impact caused by cylinder