2003 FORD MUSTANG engine

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
32003 Mustang Workshop Manual
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DIAGNOSIS AND TESTING
Engine Emission Control
Refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
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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.
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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.
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42003 Mustang Workshop Manual
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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.
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22003 Mustang Workshop Manual
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REMOVAL AND INSTALLATION
Exhaust Manifold to Exhaust Gas Recirculation (EGR)
Valve Tube
Removal and Installation
NOTE:
3.8L shown, 4.6L (2V) similar.
1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to Section 100 - 02 .
2. Disconnect the exhaust gas recirculation (EGR) valve tube from the exhaust manifold.
3. Remove the differential feedback exhaust gas recirculation (EGR) system vacuum hoses and the bracket bolts. Position the bracket assembly aside.
4. Disconnect the EGR tube from the EGR valve.
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22003 Mustang Workshop Manual
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REMOVAL AND INSTALLATION
Exhaust Manifold to Exhaust Gas Recirculation (EGR)
Valve Tube —
Cobra
Removal and Installation 1. Remove the EGR valve. For addditional information, refer to Exhaust Gas Recirculation (EGR) Valve — Cobra in this section.
2. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to Section 100 - 02 .
3. Disconnect the exhaust manifold to EGR valve tube.
4. Remove the exhaust manifold to EGR tube from the engine compartment.
5. To install, reverse the removal procedure.
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12003 Mustang Workshop Manual
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REMOVAL AND INSTALLATION
Exhaust Manifold to Exhaust Gas Recirculation (EGR)
Valve Tube —
Mach I
Removal 1. Remove the air intake scoop. For additional information, refer to Section 303 - 12 .
2. Disconnect the exhaust gas recirculation (EGR) tube from the EGR valve.
3. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to Section 100 - 02 .
4. Disconnect the EGR tube from the exhaust manifold.
5. Disconnect the hoses and remove the tube from the vehicle. Installation SECTION 303-
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