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Condition Possible cause Correction
Erratic idling
(Improper engine
idling)
Abnormal condition in ignition system
1. Defective spark plug
2. Damaged or defective coils
Abnormal condition in fuel system
1. Incorrect idle adjustment
2. Clogged air cleaner elements
Others
1. Loose connection or disconnection of vacuum hoses
2. Low compression
Adjust or replace
Connect or replace
Adjust
Clean or replace
Connect
Previously outlined
Abnormal detonation Abnormal condition in ignition system
1. Spark plugs tending to overheat
3. Loose connection in high–tension or low tension cir-
cuit. Damaged coil wires
Abnormal condition in fuel system
1. Clogged fuel filter and fuel lines
2. Malfunctioning fuel pump
Change plug heat value
Retighten
Replace or clean
Replace
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