Ford Mustang (1999-2004) Service Manual: EGR System Components

EGR System Components


EGR System Components

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 exhaust manifold tube and sends a signal to the powertrain control module. A metering orifice in the EGR valve to exhaust manifold tube restricts the flow rate when the EGR valve is open.

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 valve to exhaust manifold tube:

  • connects the exhaust manifold to the EGR valve.
  • has two tubes connecting to the EGR transducer for EGR flow monitoring.

The EGR transducer:

  • monitors the EGR flow rate through the EGR valve to exhaust manifold tube.
  • sends an EGR flow rate signal to the powertrain control module.

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

Engine Emission Control (DIAGNOSIS AND TESTING)

Refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.

    Typical Vehicle Emission Control Information (VECI) Decal
      The Vehicle Emission Control Information (VECI) decal shows: the components of the emission control system. the correct vacuum hose routing. the color stripe of the vacuum hoses. ...

    Exhaust Gas Recirculation (EGR) Valve
    Removal and Installation NOTE: The 4.6L, 2V is shown. The 3.8L is similar. 1. Disconnect the vacuum hose. 2. Disconnect the EGR tube from the EGR valve. 3. Remove the two bolts, the EGR valve an ...

    Other materials:

    Audio Unit (Removal and Installation)
    Removal and Installation 1. Remove the instrument panel center finish panel. For additional information, refer to Section 2. Remove the audio unit. 1. Remove the screws. 2. Disconnect electrical connectors. 3. Disconnect antenna cable. ...

    Exterior Trim and Ornamentation
    Torque Specifications Exterior Trim and Ornamentation The exterior trim and ornamentation consists of the following components: body side scoop hood scoop (if equipped) front spoiler (Mach 1) radiator grille rear spoiler (if equipped) ...

    Blower Motor
    Removal 1. Disconnect the jumper wire. 2. Disconnect the main harness. 3. Remove the screws. 4. Separate the cover from the motor. 5. Separate the motor from the housing. 6. Disconnect the jumper from the motor. Remove the blower motor. Installa ...