Engine Emission Control System: Specifications Mercury Monterey VIII

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

The engine emission control system consists of the

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

The VECI decal shows

Scheme 1

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

For additional information, refer to IDENTIFICATION CODES .

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

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 system module-to-exhaust manifold tube and sends a signal to the powertrain control module.

The PCV valve

1. controls the amount of ventilating air and blow-by gases going to the intake manifold.
2. prevents a backfire from reaching the crankcase.

The EGR system module-to-exhaust manifold tube

1. connects the exhaust manifold to the EGR valve.

The EGR system module transducer

1. monitors the EGR system module flow rate through the EGR to exhaust manifold tube.
2. sends an EGR system module flow rate signal to the powertrain control module.
3. provides barometric pressure reading at key-on.

The EGR vacuum regulator solenoid uses input from the powertrain control module to change the EGR system module operation.

Scheme 2

See INTRODUCTION - GASOLINE article.

Scheme 3

For additional information, refer to the Exhaust Gas Recirculation (EGR) and PCV Valve component removal and installation procedures.

Scheme 4

1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to «JACKING & LIFTING»(ref-234483) .
2. Disconnect the battery ground cable. For additional information, refer to «BATTERY, MOUNTING AND CABLES»(ref-234519) .
3. Disconnect the exhaust gas recirculation (EGR) system module-to-exhaust manifold tube upper nut. To install, tighten to 40 Nm (30 lb-ft).
4. Disconnect the EGR system module-to-exhaust manifold tube lower nut and remove the EGR system module-to-exhaust manifold tube. To install, tighten to 40 Nm (30 lb-ft).
5. Disconnect the EGR system module electrical connector.
6. Disconnect the EGR system module vacuum connector.
7. Remove the 2 bolts and the EGR system module. Remove and discard the EGR system module gasket. Carefully clean the EGR system module gasket sealing surfaces. To install, tighten to 25 Nm (18 lb-ft).
8. To install, reverse the removal procedure. Install a new EGR system module gasket with the side with the raised circle facing the intake manifold.