Engine: Description and Operation

The 3.0L (4V) is a 60 degree V-6 engine with Dual Overhead Camshafts (DOHC), four valves per cylinder and Sequential Multiport Fuel Injection (SFI). The engine has:
- an aluminum upper intake manifold.
- a lower intake manifold with integral intake manifold runner controls.
- aluminum cylinder heads.
- a cast aluminum upper cylinder block.
- a cast aluminum lower cylinder block with four integral lower main bearing caps.

CAUTION: This engine has aluminum cylinder heads and requires a special corrosion inhibiting coolant to avoid cooling system damage.

The ignition system is electronic (distributorless) with one ignition coil. This high energy ignition system is required for fast-burn combustion.
A unique intake air system utilizes a secondary intake port along with a primary intake port. The secondary port is opened and closed by an electronically operated Intake Manifold Runner Control (IMRC) deactivation motor, thus improving low and mid-range torque and fuel efficiency.

WARNING: TO AVOID THE POSSIBILITY OF PERSONAL INJURY OR DAMAGE TO THE VEHICLE, DO NOT OPERATE THE ENGINE WITH THE HOOD OPEN UNTIL THE FAN BLADE HAS FIRST BEEN EXAMINED FOR POSSIBLE CRACKS AND SEPARATION.

These engines incorporate:
- closed-type Positive Crankcase Ventilation (PCV) system.
- exhaust emission control system.

To maintain the required exhaust emission levels, the following must be kept in good operating condition and meet recommended adjustment specifications:
- engine
- fuel system
- ignition system

Make sure that the following engine components are not serviceable before replacing damaged or worn engine components:
- crankshaft
- cylinder heads
- valve guides
- exhaust valves
- intake valve
- camshafts
- cylinder block