Diagnosis And Testing: 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).

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:

1. Cylinder Combustion Pressure Leakage Test: See COMBUSTION PRESSURE LEAK TEST 
2. Cylinder Compression Pressure Test: See COMPRESSION PRESSURE TEST 
3. Engine Cylinder Head Gasket Failure Diagnosis: See CYLINDER HEAD GASKET TESTING 
4. Engine Oil Leak Inspection: See ENGINE OIL LEAK TESTING 
5. Intake Manifold Leakage Diagnosis: See INTAKE MANIFOLD LEAK TESTING