Engine Emission Control - 3.0l (4v) Mercury Mariner II рестайлинг

Material

MATERIAL SPECIFICATIONS

Torque Specifications

TORQUE SPECIFICATIONS

Note. Do not permanently remove or render inoperative any part of the vehicle emission control system including related hardware. Failure to comply may violate applicable state and federal law.

Note. The vehicle emission vacuum routing diagrams are contained in the Description and Operation subsection of the Evaporative Emissions service information. Refer to EVAPORATIVE EMISSIONS article.

The engine emission control system consists of the

1. EGR system.
2. PCV system.

EGR System

The EGR system

1. returns a small amount of exhaust gas into the engine for recombustion.
2. reduces the overall combustion temperature and provides a significant reduction of Nitrogen Oxides (NOx).

The EGR valve

1. is electronically controlled by the PCM.
2. is connected to the exhaust manifold by the EGR valve to exhaust manifold tube.
3. controls recirculated exhaust gas flow to the intake manifold.
4. monitors the flow of recirculated exhaust gases through the EGR valve to exhaust manifold tube.
5. returns a signal to the PCM.

The amount of recirculated exhaust gas depends upon

1. engine rpm.
2. intake manifold vacuum.
3. exhaust back pressure.
4. engine coolant temperature.
5. throttle position.

PCV System

The PCV system

1. uses intake manifold vacuum to ventilate blow-by vapors from the crankcase.
2. returns the vapors to the intake manifold for combustion.

The PCV valve

1. varies the amount of blow-by vapors returned to the intake manifold based on available engine vacuum.
2. is heated electronically.

Refer to the INTRODUCTION article.

Scheme 69

EGR SYSTEM COMPONENTS DESCRIPTION CHART

1. For additional information, refer to the appropriate procedures in this service information.

MATERIAL SPECIFICATIONS

Removal and Installation

1. Disconnect the EGR valve electrical connector.
2. Disconnect the exhaust manifold-to-EGR valve tube fitting from the EGR valve. To install, tighten to 40 Nm (30 lb-ft).
3. Remove the 2 bolts and the EGR valve. To install, tighten to 25 Nm (18 lb-ft).
4. Remove and discard the EGR valve gasket.
5. To install, reverse the removal procedure.

1. Disconnect the exhaust manifold-to-EGR valve tube fitting from the EGR valve. To install, tighten to 40 Nm (30 lb-ft).
2. Disconnect the exhaust manifold-to-EGR valve tube fitting from the RH exhaust manifold. To install, tighten to 40 Nm (30 lb-ft).
3. Remove the exhaust manifold-to-EGR valve tube.
4. To install, reverse the removal procedure.

MATERIAL SPECIFICATIONS

Scheme 70

PCV VALVE COMPONENTS DESCRIPTION CHART

1. Disconnect the PCV valve electrical connector.
2. Release the clamp and disconnect the crankcase ventilation tube from the PCV valve.
3. Rotate the PCV valve counterclockwise and remove it from the valve cover. Discard the PCV valve.
4. To install, reverse the removal procedure.

1. Install a new PCV valve.

See also:
• EVAPORATIVE EMISSIONS
• INTRODUCTION