| Condition | Possible Cause | Action |
|---|---|---|
|
Excessive hydrocarbon (HC) emission or carbon monoxide (CO)
|
Faulty spark plug
|
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|
Leaky or disconnected high-tension cord
|
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|
Faulty ignition coil with ignitor
|
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|
Low compression
|
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|
Lead contamination of three way catalytic converter
|
Check for absence of filler neck restrictor
|
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|
Faulty evaporative emission control system
|
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|
Fuel pressure out of specification
|
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|
Closed loop system (A/F feed back compensation) fails
– Faulty TP sensor
– Poor performance of ECT sensor or MAF sensor
|
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|
Faulty injector(s)
|
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|
Faulty ECM
|
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|
Engine not at normal operating temperature
|
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|
Clogged air cleaner
|
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|
Vacuum leaks
|
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|
Camshaft position control (VVT) system out of order
|