Ford Mustang Service Manual: Differential Pressure Feedback Exhaust Gas Recirculation (EGR) System
Engine Emission Control (Description and Operation)
CAUTION: Do not remove any part of the engine emission control system. Operating the engine without the engine emission control system will reduce fuel economy and engine ventilation. This will weaken engine performance and shorten engine life.
The engine emission control consists of the:
- positive crankcase ventilation (PCV) system.
- exhaust gas recirculation (EGR) system.
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.
The PCV system uses the intake manifold vacuum to ventilate the crankcase and return the fumes to the intake manifold for combustion.
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.
Exhaust Manifold to Exhaust Gas Recirculation (EGR)
Valve Tube - Mach I
Engine Emission Control (Description and Operation)
CAUTION: Do not remove any part of the engine emission control system.
Operating the
engine without the engine emission control system will reduce ...
Exhaust Gas Recirculation (EGR) Vacuum Regulator
Solenoid
Engine Emission Control (Description and Operation)
CAUTION: Do not remove any part of the engine emission control system.
Operating the
engine without the engine emission control system will reduce ...
Other materials:
Inspection and Verification
Inspection and Verification
CAUTION: Do not hold the steering wheel (3600) at the stops for an
extended amount of
time. Damage to the power steering pump (3A674) will result.
NOTE: Make the following preliminary checks before repairing the
steering system:
...
Release Cable - Clutch
Clutch Controls (Description and Operation)
The clutch control system engages and disengages the clutch. The clutch
control system disengages
the clutch when the clutch pedal is depressed and engages the clutch when the
clutch pedal is
released. ...
Reservoir
Hydraulic Brake Actuation (Description and Operation)
CAUTION: Blistering or swelling of rubber brake components may indicate
contamination
of the brake fluid by a petroleum based substance. New rubber components must be
installed
in the hydraulic ...