ENGINE-4.6L 2V: Other Ford Explorer III

Code Information

The engine code information label, located on the side of the valve cover and the front side of the valve cover, contains the following

1. Engine build date
2. Engine plant code
3. Engine code

Exhaust Emission Control System

Operation and necessary maintenance of the exhaust emission control devices used on this engine are covered in the SYSTEM & COMPONENT TESTING - GASOLINE .

Induction System

The sequential multiport fuel injection (SFI) provides the fuel/air mixture needed for combustion in the cylinders. The eight solenoid-operated fuel injectors

1. are mounted in the lower intake manifold.
2. meter fuel into the air intake stream in accordance with engine demand.
3. are positioned so that their tips direct fuel just ahead of the engine intake valves.
4. are connected in series with the fuel pressure sensor.
5. supply fuel from the fuel tank with a fuel pump mounted in the fuel tank.

A constant fuel pressure is maintained across the fuel injectors by the fuel pressure sensor. The fuel pressure sensor

1. is positioned upstream from the fuel injectors on the fuel injection supply manifold.

Valve Train

The valve train operates as follows

1. Ball-tip hydraulic lash adjusters provide automatic lash adjustment.
2. Roller followers ride on the camshaft lobe, transferring the up-and-down motion of the camshafts to the valves in the cylinder heads.

Positive Crankcase Ventilation System

All engines are equipped with a closed-type positive Crankcase ventilation system recycling the crankcase vapors to the upper intake manifold.

Oil Pump

The lubrication system of the 4.6L (2V) engine is designed to provide optimum oil flow to critical components of the engine through its entire operating range. The heart of the system is a positive displacement internal gear oil pump using top seal rotors. Generically this design is known as a gerotor pump, which operates as follows

1. The oil pump is mounted on the front face of the cylinder block.
2. The inner rotor is piloted on the crankshaft post and is driven through flats on the crankshaft.
3. System pressure is limited by an integral, internally-vented relief valve which directs the bypassed oil back to the inlet side of the oil pump.
4. Oil pump displacement has been selected to provide adequate volume to make sure of correct oil pressure, both at hot idle and maximum speed.
5. The relief valve calibration protects the system from excessive pressure during high viscosity conditions.
6. The relief valve is designed to provide adequate connecting rod bearing lubrication under high-temperature and high-speed conditions.

Cooling System

The engine cooling system includes the following

1. Radiator
2. Water pump
3. Electric cooling fan motor and fan blade
4. Degas bottle, which aids in maintaining the correct volume of engine coolant
5. Thermostat
6. Upper radiator hose
7. Lower radiator hose
8. Heater hoses

Drive Belt System

The 4.6L (2V) engine is equipped with a serpentine drive belt. To make sure of maximum life, install a new drive belt of the same type as originally installed.

1. The accessories mounted on the front of the engine are belt-driven by the crankshaft.
2. The serpentine drive belt is routed over each accessory pulley, driven by the crankshaft pulley bolted to the crankshaft.

Scheme 774

The accessory drive

1. has a single serpentine drive belt (six ribs).
2. has an automatic tensioner.
3. is not adjustable.

ENGINE EMISSION CONTROL

The engine emission control system consists of the

1. positive crankcase ventilation (PCV) system.
2. exhaust gas recirculation (EGR) system.

Scheme 775

The Vehicle Emission Control Information (VECI) decal shows

1. components of the emission control system.
2. the correct vacuum hose routing.
3. the color stripe of the vacuum hoses.

The PCV system uses intake manifold vacuum to ventilate the crankcase and return the fumes to the intake manifold for combustion.

Scheme 776

For basic engine mechanical concerns, refer to ENGINE SYSTEM-GENERAL INFORMATION . For driveability concerns, refer to TROUBLE SHOOTING - NO CODES - CNG, FLEX-FUEL .

Scheme 777

Scheme 778

Scheme 779

1. Verify the customer's concern by operating the engine to duplicate the condition.
2. Inspect to determine if any of the following mechanical concerns apply: The EGR system returns a portion of the exhaust gas to the intake manifold to reduce the combustion temperature. This results in lower nitrous oxide formation. The powertrain control module (PCM) controls the EGR vacuum regulator solenoid. The EGR vacuum regulator solenoid controls the vacuum to the EGR valve. When the EGR valve opens, exhaust gas flows to the intake manifold. The EGR transducer measures the flow through the EGR valve to the exhaust manifold tube and sends a signal to the powertrain control module. The PCV valve: controls the amount of ventilating air and blow-by gases going to the intake manifold. prevents a backfire from reaching the crankcase. The EGR system module to exhaust manifold tube: connects the exhaust manifold to the EGR valve. The EGR system module transducer: monitors the EGR system module flow rate through the EGR to exhaust manifold tube. sends an EGR system module flow rate signal to the powertrain control module. The EGR vacuum regulator solenoid uses input from the powertrain control module to change the EGR system module operation.
3. Inspect for drive belt cracking/chunking/wear.
4. If the concerns remain after inspection, determine the symptoms. GO to «SYMPTOM CHART»(ref-194045-S17478111492005092600000) . Under severe operating conditions (high temperature, low humidity), drive belt rib cracking can occur at less than 96,000 km (60,000 miles). Drive belt rib cracking (cracks across grooves): is not a reason for concern. has no detrimental effect on drive belt performance. Cracks parallel to grooves are acceptable. The drive belt is still perfectly functional until rib chunking occurs. Drive belt chunking is where the rubber material actually chunks out between the cracks. A new drive belt should be installed if chunking occurs.
5. If the concern(s) remains after inspection, determine the symptoms. GO to «SYMPTOM CHART»(ref-194045-S17478111492005092600000) .

Scheme 780

Scheme 781

Drive Belt - Misalignment

Note. Original equipment drive belts are made of a special cord construction and are subjected to special testing before they are approved for use.

Non-standard new drive belts may track differently or incorrectly. If a new drive belt tracks incorrectly, install a new original equipment drive belt to avoid performance failure or loss of drive belt.

With the engine running, check drive belt tracking (the position of the drive belt on one of the grooveless pulleys, idlers or drive belt tensioner. If the edge of the drive belt rides beyond the edge of the pulley, noise and premature wear may result). If a drive belt tracking condition exists, visually check the drive belt tensioner for damage, especially the mounting pad surface. If the drive belt tensioner is not installed correctly with the locating pins in the locating holes, the mounting surface pad will be out of position. This will result in abnormal drive belt tension and chirp and squeal noises.

If the above procedures do not correct the drive belt noise, install a new drive belt. However, the drive belt noise may return (with mileage) if one of the above conditions still exists uncorrected.

1. With engine running, visually observe the grooves in the pulleys (not the pulley flanges) for excessive wobble. Install new components as necessary.
2. Check all accessories, mounting brackets and drive belt tensioner, for any interference that would prevent the component from mounting correctly. Correct any interference condition and recheck belt tracking.
3. Tighten all accessories, mounting brackets and drive belt tensioner retaining hardware to specification. Recheck drive belt tracking.

Belt Tensioner

The automatic drive belt tensioner can be checked is follows

1. With the engine running, observe the drive belt tensioner movement. The drive belt tensioner should move (respond) when the A/C clutch cycles or when the engine is accelerated rapidly. If the drive belt tensioner movement is constant without A/C clutch cycling or acceleration, a pulley or shaft is probably bent or a pulley is out of round. In rare cases, excessive drive belt rideout (uneven depth of grooves in drive belt) can cause excessive drive belt tensioner movement. This condition can be checked by removing the suspect drive belt and installing a known good original equipment drive belt and repeating the observation.

Refer to SYSTEM & COMPONENT TESTING - GASOLINE .

Scheme 782

Scheme 783

Scheme 784

1. Remove the engine cooling fan. For additional information, refer to «ENGINE COOLING»(ref-194047).
2. To remove individual components, carry out only the listed steps (Scheme 782)and (Scheme 783).
3. Remove the components in the order indicated in the (Scheme 784).
4. To install, reverse the removal procedure.

Scheme 785

1. Rotate the tensioner clockwise and remove the drive belt.

Scheme 786

1. Remove the components in the order indicated in the following illustration and table.
2. To install, reverse the removal procedure.

Scheme 787

1. Disconnect the battery ground cable. For additional information, refer to «BATTERY AND CHARGING SYSTEM»(ref-194056) .
2. Remove the air cleaner. For additional information, refer to «REMOVAL & INSTALLATION»(ref-156578) .
3. To install, reverse the removal procedure.

Scheme 788

1. Remove the air intake tube. For additional information, refer to «REMOVAL & INSTALLATION»(ref-156578) .
2. Remove the components in the order indicated in the following illustration and table.
3. To install, reverse the removal procedure.