Engine: Description and Operation

Engine Component View
The concept of modularity allows engine designs to share communization between concepts and engine hardware. The illustration (modular engine-typical) represents the basic cross sectional view of a modular V8 engine. The four modules are the:
- intake module
- cylinder head module (RH)
- cylinder head module (LH)
- lower engine module

The modular engine concept supports efficiencies during repairs by allowing the removal and installation of these modules. While not all in-vehicle repairs can take advantage of the modular concept, most out-of-vehicle repairs benefit in reduction of time and labor needed to repair the engine.

The basic engine components consist of:
- single overhead camshafts
- two valves per cylinder
- sequential multiport fuel injection (SFI)
- aluminum cylinder heads
- cast iron, 90-degree V- cylinder block
- individual ignition coils for each spark plug
- composite-material lower intake manifold with noise insulator
- Large-bore throttle body

The engine incorporates the following features:
- a closed positive crankcase ventilation (PCV) system.
- an exhaust emission control system.
- an evaporative emission control system.

Some engines incorporate a fail-safe cooling system.

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.

NOTE: Engine; Service and Repair; General Procedures contains information, steps and procedures that may not be specific to your engine. This covers general procedures and diagnosis and testing of the engine system.