Engine Emission Control System: Other Ford Ranger II рестайлинг

EGR

The EGR system returns a small amount of exhaust gas into the intake manifold. This reduces the overall combustion temperature. Cooler combustion temperatures provide a significant reduction of the Nitrogen Oxides (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.

4.0L SOHC Engine

The 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 to be returned to the combustion cycle. The differential pressure feedback EGR system monitors the flow and returns a signal to the PCM.

The amount of recirculated exhaust gas depends upon

1. engine RPM.
2. intake manifold vacuum.
3. exhaust backpressure.
4. Engine Coolant Temperature (ECT).
5. throttle position.

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 2.3L engine does this through a coolant-heated fitting. The PCV valve 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.

Scheme 34

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Scheme 35

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Refer to the INTRODUCTION - GASOLINE MODELS .

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Scheme 37

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All vehicles

Scheme 38

1. Drain the cooling system. For additional information, refer to «ENGINE COOLING»(ref-365412) .
2. Disconnect the EGR valve electrical connector. Vehicles equipped with a manual transmission
3. Remove the shifter. For additional information, refer to «MANUAL TRANSAXLE/TRANSMISSION»(ref-365417) . All vehicles
4. Remove the rear driveshaft. For additional information, refer to «DRIVESHAFT»(ref-365399) .
5. Remove the exhaust downpipe. For additional information, refer to «EXHAUST SYSTEM»(ref-365376) .
6. NOTE: Manual transmission shown, automatic transmission similar. Support the transmission with a suitable transmission jack.
7. Remove the 6 crossmember-to-frame bolts (3 on each side). To install, tighten to 99 Nm (73 lb-ft).
8. Detach the transmission electrical connector and wiring harness retainers from the crossmember. Remove the 2 transmission mount nuts and the crossmember. To install, tighten to 99 Nm (73 lb-ft).
9. Lower the transmission enough to allow access to the EGR valve.
10. Disconnect the coolant bypass hose.
11. Disconnect the EGR coolant hose.
12. Remove the 2 bolts and the EGR valve. Discard the gasket. To install, tighten to 20 Nm (177 lb-in).
13. NOTE: Clean the gasket mating surfaces and install a new gasket. To install, reverse the removal procedure.

Scheme 39

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Differential Pressure Feedback Exhaust Gas Recirculation (EGR) Sensor - 4.0L SOHC

1. Disconnect the pushpin retainer from the differential pressure feedback EGR sensor.
2. Disconnect the differential pressure feedback EGR sensor electrical connector.
3. Remove the differential pressure feedback EGR sensor from the hoses.
4. To install, reverse the removal procedure.

Exhaust Gas Recirculation (EGR) Vacuum Regulator Solenoid - 4.0L SOHC

1. Disconnect the electrical and vacuum connectors from the EGR vacuum regulator solenoid.
2. Remove the retaining bolts and the EGR vacuum regulator solenoid. To install, tighten to 10 Nm (89 lb-in).
3. To install, reverse the removal procedure.

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Scheme 43

1. Remove the LH front wheel and tire. For additional information, refer to «WHEELS & TIRES»(ref-365372) .
2. Remove the left front inner fender splash shield.
3. Disconnect the coolant bypass hose from the routing clip.
4. Gently pry the PCV valve cap off the 2 tabs.
5. Remove the PCV valve from the crankcase vent oil separator and disconnect the vacuum hose.
6. To install, reverse the removal procedure.

Scheme 44

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LH Inner Fender Splash Shield

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Scheme 45

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Scheme 46

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