Spark Test; Spark Plug - Mazda MX-5 1990 Workshop Manual

G
IGNITION SYSTEM
05UOGX-043
05UOGX-044
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05UOGX-045
WEAR AND CARBON BUILDUP
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DETERIORATION
DAMAGE
05UOGX-046
G-20
11. Increase the engine speed and verify that the ignition tim-
ing advances.
SPARK PLUG
Removal I Installaion
Note the following points:
1_ When the high-tension lead is to be pulled off, be sure to
pull on the boot, not the wire.
2_ Apply anti-seize compound or molybdenum-based lubricant
to the spark plug threads before installing.
3_ Tighten the spark plugs to the specified torque_
Tightening torque:
15-23 N·m (1.5-2.3 m-kg, 11-17 ft-Ib)
Spark Test
1_ Disconnect the high-tension lead from the spark plug.
2. Connect a new spark plug to the high-tension lead.
3. Hold with insulated pliers approx. 5-1 Omm (0.20-0.39
in) from a ground.
4_ Crank the engine and verify that a strong blue spark is
visible.
Inspection
Check the following and replace the spark plugs as necessary_
1. Damaged insulation.
2. Worn electrodes.
3. Carbon deposits.
If cleaning is necessary, use a plug cleaner or a wire brush.
Wipe upper insulator.
4. Damaged gasket.
Plug gap: 1.0-1.1 mm (0.039-0.043 in)