Engine Emission Control - 2.3L: Other Ford Focus I рестайлинг

Exhaust Gas Recirculation

The EGR system returns a small amount of exhaust gas into the intake manifold (9424). This reduces the overall combustion temperature. Cooler combustion temperatures provide a significant reduction of the oxides of nitrogen (NOx) in the exhaust emissions.

2.3L Engine

The 2.3L engine incorporates a stepper motor-controlled EGR valve which receives its signal from the PCM. Engine coolant is used to cool the EGR valve. The EGR valve and stepper motor are serviced as an assembly.

The amount of recirculated exhaust gas depends upon

1. engine rpm.
2. intake manifold vacuum.
3. exhaust backpressure.
4. engine coolant temperature.
5. throttle position.

Exhaust Emission Control System

The vehicle emission control information (VECI) decal is located on the upper radiator support and shows

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

Positive Crankcase Ventilation (PCV) System

The PCV system uses intake manifold vacuum to ventilate blow-by fumes from the crankcase and return the fumes to the intake manifold for combustion. The PCV valve (6A666) varies the amount of blow-by gasses returned to the intake manifold based on available engine vacuum. The PCV valve also prevents the entry of combustion backfiring into the crankcase.

Refer to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE .

Material

MATERIAL SPECIFICATION

Scheme 43

Scheme 44

Scheme 45

Scheme 46

Scheme 47

1. Drain the cooling system. For additional information, refer to «ENGINE COOLING»(ref-207748) .
2. Remove the battery tray. For additional information, refer to «BATTERY, MOUNTING AND CABLES»(ref-207791) .
3. Loosen the clamps, disconnect the vent tube and remove the air cleaner outlet pipe.
4. Disconnect the electrical connector.
5. Loosen the clamp and disconnect the hose. Position the hose aside.
6. Loosen the clamp and disconnect the coolant hose.
7. Remove the bolts and the exhaust gas recirculation (EGR) valve.
8. To install, reverse the removal procedure.
9. Fill and bleed the cooling system. For additional information, refer to «ENGINE COOLING»(ref-207748) .

Scheme 48

Scheme 49

1. Remove the intake manifold. For additional information, refer to «ENGINE-- 2.3L»(ref-234427) .
2. Loosen the clamp and disconnect the hose.
3. Disengage the positive crankcase ventilation (PCV) valve cap from the two tabs and remove the valve.
4. To install, reverse the removal procedure.

MATERIAL SPECIFICATION

Scheme 50

Scheme 51

1. Remove the intake manifold. For additional information, refer to «ENGINE-- 2.3L»(ref-234427) .
2. Disengage the positive crankcase ventilation (PCV) valve cap from the two tabs and position the PCV valve and hose aside.
3. Remove the bolts and remove the crankcase vent oil separator.
4. To install, reverse the removal procedure.

Scheme 52

Scheme 53

Scheme 54

1. Raise and support the vehicle. For additional information, refer to «JACKING AND LIFTING»(ref-234418) .
2. Disconnect the secondary air injection (AIR) electrical connector.
3. Remove the two mounting screws.
4. Disconnect the AIR outlet tube.
5. Remove AIR pump.
6. To install, reverse the removal procedure.

Scheme 55

Scheme 56

Scheme 57

Scheme 58

1. Disconnect the secondary air injection (AIR) inlet tube from the valve.
2. Disconnect the AIR outlet tube from the valve.
3. Disconnect the vacuum line from the AIR valve.
4. Remove the two mounting screws and the valve.
5. To install, reverse the removal procedure.