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Engine Emission Control Ford Explorer Sport Trac II

Auxiliary Emission Control Systems 4 illustrations ~467 words

TORQUE SPECIFICATIONS

DescriptionNm
Exhaust manifold-to-EGR system module tube fittings - 4.0L SOHC40
EGR system module bolts - 4.0L SOHC25

TORQUE SPECIFICATIONS

CAUTIONDo 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 system consists of the

  1. PCV system.
  2. EGR system (4.0L SOHC only).

PCV System - The PCV system consists of the

  1. PCV valve.
  2. hoses.

The PCV system uses intake manifold vacuum to ventilate the crankcase and return the fumes to the intake manifold for combustion.

The PCV valve

  1. controls the amount of ventilating air and blow-by gases going to the intake manifold.
  2. is integral to the LH valve cover on the 4.6L (3V) engine. If a new PCV valve must be installed, a new valve cover must be installed on a 4.6L (3V) engine. Refer to «ENGINE - 4.6L (3V)»(/ford/explorer-sport-trac/ii-2006-2010/remont/mechanical/#engine-46l-3v) article.

EGR System - The EGR system consists of the

  1. EGR system module which incorporates the following components in one unit: EGR valve. EGR system module transducer. EGR vacuum regulator solenoid.
  2. exhaust manifold-to-EGR system module tube.

Note. Only the 4.0L SOHC engine is equipped with an EGR system. The 4.6L (3V) engine uses a variable camshaft timing system.

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 (NOx) formation.

The PCM controls the EGR system module. When the EGR system module valve opens, exhaust gas flows to the intake manifold.

The EGR valve controls the amount of exhaust gas flowing into the intake manifold.

The EGR system module transducer

  1. monitors the EGR system module flow rate through the EGR valve.
  2. sends an EGR system module flow rate signal to the PCM.

The EGR vacuum regulator solenoid uses input from the PCM to change the EGR system module operation.

The exhaust manifold-to-EGR system module tube

  1. connects the exhaust manifold to the EGR valve.

Scheme 1

Scheme 1: Evaporative Emission (EVAP), EGR and PCV Vacuum Routing
Scheme 1: Evaporative Emission (EVAP), EGR and PCV Vacuum Routing
ItemPart NumberDescription
1EGR valve (part of 9D475)
2EGR vacuum regulator solenoid (part of 9D475)
3EGR differential pressure sensor (part of 9D475)
46583RH valve cover
59B659Air cleaner (ACL) outlet pipe
62002Brake booster
76A666PCV valve
86A513LH valve cover
99G756Fuel rail pressure and temperature sensor
109424Intake manifold
119C915Evaporative emissions (EVAP) canister purge valve
129002Fuel tank
139034Fuel tank filler pipe
14Fuel tank vent valve
159H703Fuel pump module
169C052Fuel tank pressure sensor
179D635EVAP canister
189B328Dust separator
199F945EVAP canister vent valve

Scheme 2

Scheme 2
Scheme 2
ItemPart NumberDescription
16583RH valve cover
26B059Air cleaner (ACL) outlet pipe
32002Brake booster
46A666PCV valve
56A513LH valve cover
69424Intake manifold
79C915Evaporative emissions (EVAP) canister purge valve
89002Fuel tank
99034Fuel tank filler pipe
10Fuel tank vent valve
119H307Fuel pump module
129C052Fuel tank pressure sensor
139D653EVAP canister
149B328Dust separator
159f945EVAP canister vent valve

Refer to the Introduction - Gasoline Engines article.

Scheme 3

Scheme 3: Exhaust Gas Recirculation (EGR) System Components - Exploded View, 4.0L SOHC
Scheme 3: Exhaust Gas Recirculation (EGR) System Components - Exploded View, 4.0L SOHC
ItemPart NumberDescription
1EGR system module electrical connector (part of 12B637)
29E498Engine vacuum harness
3EGR system module-to-exhaust manifold tube upper fitting (part of 9E469)
4EGR system module-to-exhaust manifold tube lower fitting (part of 9E469)
59E469EGR system module-to-exhaust manifold tube
6W506024EGR system module bolts (2 required)
79D475EGR system module
89D476EGR system module gasket
  1. For additional information, refer to the procedures.

REMOVAL AND INSTALLATION

  1. Disconnect the EGR system module electrical and vacuum connectors.
  2. Disconnect the EGR system module-to-exhaust manifold tube upper fitting. To install, tighten to 40 N.m (30 lb-ft).
  3. Remove the bolts, the EGR system module and the gasket. Discard the gasket. To install, tighten to 25 N.m (18 lb-ft).
  4. Carefully clean the EGR system module sealing surfaces.
  5. To install, reverse the removal procedure. Install a new EGR system module gasket.
  1. Disconnect the EGR system module-to-exhaust manifold tube upper fitting. To install, tighten to 40 N.m (30 lb-ft).
  2. Disconnect the EGR system module-to-exhaust manifold tube lower fitting and remove the tube. To install, tighten to 40 N.m (30 lb-ft).
  3. To install, reverse the removal procedure.

Scheme 4

Scheme 4: Positive Crankcase Ventilation (PCV) Valve - 4.0L SOHC
Scheme 4: Positive Crankcase Ventilation (PCV) Valve - 4.0L SOHC
ItemPart NumberDescription
114A464PCV valve electrical connector (part of 12B637)
26K817PCV valve hose
36A666PCV valve
  1. Disconnect the PCV valve electrical connector.
  2. Disconnect the PCV valve hose.
  3. Rotate the PCV valve counterclockwise and remove it from the valve cover.
  4. To install, reverse the removal procedure.

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