Condition | Possible Cause | Action |
---|---|---|
Excessive hydrocarbon (HC) emission or carbon monoxide (CO)
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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
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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
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