| Condition | Possible Cause | Action |
|---|---|---|
|
Improper engine idling or engine fails to idle
|
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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|
Fuel pressure out of specification
|
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|
Leaky manifold, throttle body, or cylinder head gasket
|
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Malfunctioning EGR valve
|
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|
Faulty idle air control system
|
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|
Faulty evaporative emission control system
|
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Faulty EGR system
|
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|
Faulty fuel injector(s)
|
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Poor performance of ECT sensor, TP sensor or MAF sensor
|
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|
Faulty ECM
|
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|
Loose connection or disconnection of vacuum hoses
|
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|
Malfunctioning PCV valve
|
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|
Engine overheating
|
“Overheating” under
Engine Symptom Diagnosis:M13A with VVT
|
|
|
Low compression
|
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|
Camshaft position control (VVT) system out of order
|