Engine Diagnosis: Notes

Engine diagnosis is helpful in determining the causes of malfunctions not detected and remedied by routine maintenance.

These malfunctions may be classified as either mechanical (e.g., a strange noise), or performance (e.g., engine idles rough and stalls). See Fig 1 and Fig 2 for possible causes and corrections of malfunctions.

Additional tests and diagnostic procedures may be necessary for specific engine malfunctions that cannot be isolated with the Service Diagnosis charts. Information concerning additional tests and diagnosis is provided within the following:

Cylinder Compression Pressure: Refer to CYLINDER COMPRESSION PRESSURE TEST .
Test Cylinder Combustion Pressure Leakage Test: Refer to CYLINDER COMBUSTION PRESSURE LEAKAGE TEST .
Cylinder Head Gasket Failure Diagnosis: Refer to CYLINDER-TO-CYLINDER LEAKAGE TEST .
Intake Manifold Leakage Diagnosis: Refer to INTAKE MANIFOLD LEAKS .
Lash Adjuster (Tappet) Noise Diagnosis: Refer to LASH ADJUSTER (TAPPET) NOISE DIAGNOSIS .
Engine Oil Leak Inspection: Refer to ENGINE OIL LEAK INSPECTION .

Fig 1: Engine Performance (1 of 2)

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Fig 2: Engine Performance (2 of 2)

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Fig 3: Engine Mechanical (1 of 3)

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Fig 4: Engine Mechanical (2 of 3)

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Fig 5: Engine Mechanical (3 of 3)

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