Diagnostic Strategies

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 the Diagnostic Charts - Mechanical and the Diagnostic Charts - Performance, for possible causes and corrections of malfunctions. Refer to the appropriate Diagnostic Information for fuel system diagnosis.
Additional tests and diagnostic procedures may be necessary for specific engine malfunctions that cannot be isolated with the Engine Diagnosis charts. Information concerning additional tests and diagnosis is provided within the following:
- Cylinder Compression Pressure Test
- Cylinder Combustion Pressure Leakage Test
- Cylinder Head Gasket Failure Diagnosis
- Intake Manifold Leakage Diagnosis
- Lash Adjuster (Tappet) Noise Diagnosis
- Engine Oil Leak Inspection