Hyundai Sonata 1991 Shop Manual page 154

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IGNITION SYSTEM
CHECKING SPARK PLUGS
Y27DFOA
INSPECTION AND CLEANING OF SPARK PLUGS
1.
Disconnect the spark plug cable from the spark plug.
NOTE
When the spark plug cable is pulled off, be sure to remove
by pulling on the spark plug boot. If the spark plug cable
is removed by pulling on the cable, it may be damaged.
2.
Using a plug wrench, remove all the spark plugs from the
cylinder head.
27Y065
CAUTION
Use care not to allow foreign matter to enter through the
spark plug holes.
3.
Check the spark plugs for the following:
1)
Broken insulator
2)
Worn electrode
3)
Carbon deposits
4)
Damaged or broken gasket.
5)
Burnt condition of the porcelain insulator at the spark
gap.
Condition
Dark deposite
White deposite
Description o Too rich a fuel
o Too lean a fuel mixture
mixture
o Advanced ignition timing
o Low air intake
o Insufficient plug tightening
4.
Check the spark plug gap using a wire gap gauge and adjust
if necessary.
Standard value: 1.0-1.1 mm (0.039-0.043 in.)
IIIII111
GAP
27Y066
27Y067
27-35

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