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).

For Engine Performance diagnosis. Refer to ENGINE PERFORMANCE DIAGNOSTIC TABLE .

For Engine Mechanical diagnosis. Refer to ENGINE MECHANICAL DIAGNOSTIC TABLE .

For Fuel Delivery system diagnosis. Refer to FUEL DELIVERY, GAS, DIAGNOSIS AND TESTING .

For Cooling System diagnosis. Refer to DIAGNOSIS AND TESTING .

For Engine Lubrication System diagnosis. Refer to ENGINE LUBRICATION DIAGNOSTIC TABLE .

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

• Cylinder Compression Pressure Test
• Cylinder Combustion Pressure Leakage Test
• Cylinder Head Gasket Leakage Diagnosis
• Mechanical Valve Tappet Noise Diagnosis
• Exhaust System leak testing