vacuum FORD MUSTANG 2003 Workshop Manual

REMOVAL AND INSTALLATION
Supply Manifold
Removal
WARNING: Do not smoke or carry lighted tobacco or open flame of any type when
working on or near any fuel related components. Highly flammable mixtures are always present
and can ignite. Failure to follow these instructions can result in personal injury.
WARNING: Fuel in the fuel system remains under high pressure even when the engine is
not running. Before working on or disconnecting any of the fuel lines or fuel system
components, the fuel system pressure must be relieved. Failure to follow these instructions
can result in personal injury.
1. Disconnect the battery ground cable. For additional information, refer to Section 414 - 01 .
2. Remove the upper intake manifold. For additional information, refer to Section 303 - 01D .
3. Relieve the fuel pressure. For additional information, refer to Section 310 - 00 .
4. Disconnect the fuel line. For additional information, refer to Section 310 - 00 .
5. Position the wiring harness aside. zDisconnect the RH fuel injector electrical connectors.
z Separate the harness from the RH fuel supply manifold stud bolt.
6. Disconnect the fuel pressure sensor. zDisconnect the electrical connector.
z Disconnect the vacuum hose.
SECTION 303-
04D: Fuel Charging and Controls — Mach I 4.6L (4V) 2003 Mustang Workshop Manual Klj . 1 ba
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SPECIFICATIONS
SECTION 303-
05: Accessory Drive 2003 Mustang Workshop Manual General Specifications
Item Specification
Accessory drive belt 6 ribs
Supercharger drive belt 8 ribs
Torque Specifications Description Nm lb-
ft lb-
in Belt idler pulley bolt 25 18 —
Drive belt tensioner bolt —
3.8L 82 60 —
Drive belt tensioner bolt —
4.6L 10 — 89
Drive belt tensioner bolt —
Supercharged engine 25 18 —
Cooling hose mounting bolt 25 18 —
Belt idler support assembly bracket bolts 25 18 —
Air intake scoop bolts 25 18 —
Air intake scoop bracket bolt 25 18 —
Air intake scoop bracket nuts 25 18 —
Air intake scoop bracket throttle body nut 9 — 80
Exhaust gas recirculation (EGR) vacuum regulator solenoid bolts 10 — 89 Klj . 1 ba
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SPECIFICATIONS
SECTION 303-
08: Engine Emission Control 2003 Mustang Workshop Manual Torque Specifications
Description Nm lb-
ft lb-
in EGR vacuum regulator solenoid nuts 7 — 62
Differential pressure feedback EGR 7 — 62
Differential pressure feedback EGR —
Bullitt 10 — 89
EGR valve bolts 10 — 89
EGR valve-to-
exhaust manifold tube fitting 35 26 —
EGR tube-
to-exhaust manifold fitting (except Bullitt) 40 30 —
EGR tube-
to-exhaust manifold fitting 35 26 —
Vacuum accessory bracket fasteners 10 — 89
Air intake scoop bolts 25 18 —
Air intake scoop bracket bolt 25 18 —
Air intake scoop bracket nuts 25 18 —
Air intake scoop bracket throttle body nut 9 — 80
Exhuast gas recirculation (EGR) vacuum regulator solenoid bolts 10 — 89 Klj . 1 ba
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DESCRIPTION AND OPERATION
Engine Emission Control
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:
zpositive crankcase ventilation (PCV) system.
z exhaust gas recirculation (EGR) system.
Typical Vehicle Emission Control Information (VECI) Decal
The Vehicle Emission Control Information (VECI) decal shows:
zthe components of the emission control system.
z the correct vacuum hose routing.
SECTION 303-
08: Engine Emission Control 2003 Mustang Workshop Manual Item Part Number Description
1 — Adjustment procedure notes
2 — Ignition timing specification
3 — Engine vacuum hose routing (typical)
4 — Spark plug gap specification
5 — Engine type Klj . 1 ba
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z
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:
zcontrols the amount of ventilating air and blow- by gases going to the intake manifold.
z prevents a backfire from reaching the crankcase.
The EGR valve to exhaust manifold tube:
zconnects the exhaust manifold to the EGR valve.
z has two tubes connecting to the EGR transducer for EGR flow monitoring.
The EGR transducer:
zmonitors the EGR flow rate through the EGR valve to exhaust manifold tube.
z 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. Item Part Number Description
1 12A65 Powertrain control module
2 9J459 EGR vacuum regulator solenoid
3 9D475 EGR valve
4 9J433 EGR transducer
5 — Metering orifice
6 9D477 EGR valve to exhaust manifold tube Klj . 2 ba
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REMOVAL AND INSTALLATION
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 and the gasket.
4. NOTE: Install a new gasket.
To install, reverse the removal procedure.
SECTION 303-
08: Engine Emission Control 2003 Mustang Workshop Manual Klj . 1 ba
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REMOVAL AND INSTALLATION
Exhaust Gas Recirculation (EGR) Valve —
Cobra
Removal and Installation 1. Disconnect the accelerator cable and the speed control cable.
2. Remove the accelerator cable bracket bolts.
3. Release the clip and position the accelerator cable bracket and the cables aside.
4. Disconnect the electrical connectors from the fuel pulse damper, EGR vacuum regulator solenoid, supercharger bypass vacuum solenoid, and the differential pressure feedback EGR
system.
SECTION 303-
08: Engine Emission Control 2003 Mustang Workshop Manual Klj . 1 ba
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5. Disconnect the vacuum hoses from the differential pressure feedback EGR system.
6. Disconnect the vacuum hoses from the supercharger bypass vacuum solenoid, and the
actuator.
7. Disconnect the vacuum hoses from the fuel pulse damper and the EGR vacuum regulator solenoid.
8. Disconnect the vacuum hose from the EGR valve. Klj . 2 ba
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9. Disconnect the vacuum hoses at the back of the supercharger and position the vacuum harness
aside.
10. Remove the vacuum accessory bracket mounting nut.
11. Remove the mounting bolts, and the vacuum accessory bracket. 12. Disconnect the exhaust manifold to EGR valve tube. Klj . 3 ba
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REMOVAL AND INSTALLATION
Exhaust Gas Recirculation (EGR) Valve —
Mach I
Removal and Installation 1. Remove the air intake scoop. For additional information, refer to Section 303 - 12 .
2. Remove the exhaust gas recirculation (EGR) valve. 1. Disconnect the EGR tube upper fitting.
2. Disconnect the vacuum hose.
3. Remove the two bolts and remove the EGR valve and gasket.
3. CAUTION: Do not use metal scrapers, wire brushes, power abrasive disks or other
abrasive means to clean the sealing surfaces. These tools cause scratches and gouges,
which make leak paths. Use a plastic scraping tool to remove all traces of old sealant.
Clean and inspect the mating surfaces.
4. To install, reverse the removal procedure. zInstall a new gasket.
SECTION 303-
08: Engine Emission Control 2003 Mustang Workshop Manual Klj . 1 ba
22003 Mustang Workshop Manual
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