Description And Operation: Engine

CAUTION: When repairing engines, all parts must be contamination free. If contamination/foreign material is present when repairing an engine, premature engine failure can occur.

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 the Powertrain Control/Emissions Diagnosis Manual.

The engine incorporates the following features:

a closed positive crankcase ventilation (PCV) system. For additional information, refer to ENGINE EMISSION CONTROL .
an exhaust emission control system. For additional information, refer to ENGINE EMISSION CONTROL .
an evaporative emission control system. For additional information, refer to EVAPORATIVE EMISSIONS .

Some engines incorporate a fail-safe cooling system. Refer to the appropriate engine article.

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. Refer to the scheduled Maintenance Guide.

Correct engine identification is required to order parts. Refer to the appropriate engine article for the procedure.

For complete vehicle and engine identification codes, refer to IDENTIFICATION CODES .