Diagnostic Strategies

DIAGNOSIS AND TESTING - ENGINE DIAGNOSIS - INTRODUCTION
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). Refer to Service Diagnosis-Mechanical Chart and Service Diagnosis-Performance Chart, 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 Test
Cylinder Compression Pressure Test

- Cylinder Combustion Pressure Leakage Test
Cylinder Leak Down Test

- Cylinder Head Gasket Failure Diagnosis
Testing and Inspection

- Intake Manifold Leakage Diagnosis
Testing and Inspection

- Lash Adjuster (Tappet) Noise Diagnosis
Testing and Inspection

- Engine Oil Leak Inspection
Engine Oil Leak Inspection