Engine Diagnosis - Introduction

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 the Engine Mechanical and the Engine Performance diagnostic charts, for possible causes and corrections of malfunctions Refer to ENGINE DIAGNOSIS - MECHANICAL Refer to ENGINE DIAGNOSIS PERFORMANCE. Engine Diagnosis - Mechanical Engine Diagnosis - Performance


For fuel system diagnosis, Refer to CHECKING THE FUEL DELIVERY SYSTEM. Checking the Fuel Delivery System


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 Combustion Pressure Leakage Test
- Engine Cylinder Head Gasket Failure Diagnosis Testing and Inspection
- Intake Manifold Leakage Diagnosis Testing and Inspection
- Mechanical Valve Tappet Noise Diagnosis
- Engine Oil Leak Inspection Engine Oil Leak Inspection