Description And Operation: Engine

NOTE: This article contains information, steps and procedures that may not be specific to your engine.

This article covers general procedures and diagnosis and testing of the engine system, except for exhaust emission control devices, which are covered in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV and SYSTEM & COMPONENT TESTING - EEC-V - GASOLINE & NGV .

The engine incorporates the following features:

a closed positive crankcase ventilation (PCV) system. For additional information, refer to THEORY & OPERATION - GASOLINE & NGV .
an exhaust emission control system. For additional information, refer to THEORY & OPERATION - GASOLINE & NGV .
an evaporative emission control system. For additional information, refer to THEORY & OPERATION - GASOLINE & NGV .

Some engines incorporate a fail-safe cooling system. Refer to ENGINE COOLING for the procedure.

The engine, fuel system, ignition system, emissions system and exhaust system all affect exhaust emission levels and must be maintained according to the maintenance schedule.

Correct engine identification is required to order parts. Refer to INTRODUCTION - TRUCKS for the procedure.

For complete vehicle and engine identification codes, refer to INTRODUCTION - TRUCKS .