Excessive detonation – Engine continuously generates sharp, metallic knocking sound that changes with throttle opening.
Precautions: General safety (00)
Perform troubleshooting referring to the following points when ECM has detected no DTC and no abnormality has been found in Visual Inspection:M16A and Engine Basic Inspection:M16A.
| Condition | Possible Cause | Action |
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Excessive detonation – Engine continuously generates sharp, metallic knocking sound that changes with throttle opening.
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Faulty spark plug
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Engine overheating
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Condition “Engine overheating”
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Clogged fuel filter (faulty fuel pump) or fuel lines
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Air drawn in through intake manifold or throttle body gasket
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Check air intake system.
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Poor performance of knock sensor, ECT sensor or MAP sensor
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Faulty fuel injector
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Faulty ECM
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Excessive combustion chamber deposits
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VVT system out of order
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•VVT actuator: VVT Actuator, Camshaft, Tappet and Shim Inspection:M16A
•Valve timing: Timing Chain and Chain Tensioner Inspection:M16A •OCV oil circuit: Timing Chain Cover Inspection:M16A |