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1962 chevy impala 327 positive crankcase ventilation system

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1984-1995 Honda Civic/ CRX Positive Crankcase Ventilation (PCV) System Repair Manual

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The PCV system is designed to prevent blow-by gas from escaping to the atmosphere by drawing it directly into the intake manifold. The PCV valve contains a spring-loaded plunger which is lifted in proportion to intake manifold vacuum. Under high vacuum, blow-by is returned directly to the manifold through the breather chamber and PCV valve with fresh air. When intake manifold vacuum decreases (wide open throttle) and vacuum in the air cleaner increases, the PCV valve closes and the blow-by is returned through the cylinder head cover breather hose and into the air cleaner. The PCV valve also acts as a check valve when the engine backfires to prevent crankcase explosion. Fig. 1: PCV system components-1984-87 1.5L engines Fig. 2: PCV system components-1988-91 1.6L engines Fig. 3: PCV system components-1992-95 engines Fig. 4: PCV system components-1984-87 carbureted engines SERVICE Positive Crankcase Ventilation (PCV) Valve For PCV valve removal, refer to Routine Maintenance of this information. 1. Locate the PCV valve. With the engine running at idle, use pliers to pinch the PCV hose between the valve and the intake manifold. It should be possible to hear the spring loaded valve click shut. 2. If no click is heard, remove the valve from the engine but leave it connected to the intake manifold. A hissing sound should be heard and vacuum should be felt at the valve inlet. 3. If no vacuum is felt, remove the valve from the intake manifold hose. The engine should stall or almost stall. This will indicate a stuck valve or clogged hose. Check the breather hose for clogging or leaks and replace any defective parts. Exhaust Gas Recirculation (EGR) System FUEL INJECTED ENGINES General Information See Figure 3 The Exhaust Gas Recirculation (EGR) system is used to control emissions measured at the tailpipe. Components included are the EGR valve and controls. The EGR system uses a poppet type valve to regulate the amount of exhaust gas flowing into the intake manifold. The flow path is cast into the cylinder head and does not use any external tubing. A control solenoid valve regulates the amount of vacuum to the EGR valve. A Constant Volume Control (CVC) valve provides a constant amount of vacuum to the control solenoid valve over a wide range of engine vacuum. When servicing or repairing any part of the emissions system, it is absolutely essential to check for any obvious mechanical faults or failures. Remember, a trouble code only indicates which sensor or circuit is affected by the problem. Simple mechanical faults such as a vacuum leak or poor electrical connection can cause a fault code. The EGR valve is not simply open or closed but is modulated by controlling the amount of engine vacuum to the valve diaphragm, up to a maximum of 8 in. Hg of vacuum. The EGR valve has a sensor in the top of the valve that reports valve lift to the ECU (same as ECM, 1992-95). The ECU modulates the position of the control solenoid valve to control the EGR valve lift according to an internal program. Upstream of the control solenoid valve, the CVC provides a constant supply of vacuum so EGR control is precise under all manifold vacuum conditions

Honda Civic/ CRX Positive Crankcase Ventilation (PCV) System OPERATION MANUAL

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The PCV system is designed to prevent blow-by gas from escaping to the atmosphere by drawing it directly into the intake manifold. The PCV valve contains a spring-loaded plunger which is lifted in proportion to intake manifold vacuum. Under high vacuum, blow-by is returned directly to the manifold through the breather chamber and PCV valve with fresh air. When intake manifold vacuum decreases (wide open throttle) and vacuum in the air cleaner increases, the PCV valve closes and the blow-by is returned through the cylinder head cover breather hose and into the air cleaner. The PCV valve also acts as a check valve when the engine backfires to prevent crankcase explosion. Fig. 1: PCV system components-1984-87 1.5L engines Fig. 2: PCV system components-1988-91 1.6L engines Fig. 3: PCV system components-1992-95 engines Fig. 4: PCV system components-1984-87 carbureted engines
SERVICE Positive Crankcase Ventilation (PCV) Valve For PCV valve removal, refer to Routine Maintenance of this information. 1. Locate the PCV valve. With the engine running at idle, use pliers to pinch the PCV hose between the valve and the intake manifold. It should be possible to hear the spring loaded valve click shut. 2. If no click is heard, remove the valve from the engine but leave it connected to the intake manifold. A hissing sound should be heard and vacuum should be felt at the valve inlet. 3. If no vacuum is felt, remove the valve from the intake manifold hose. The engine should stall or almost stall. This will indicate a stuck valve or clogged hose. Check the breather hose for clogging or leaks and replace any defective parts. Exhaust Gas Recirculation (EGR) System FUEL INJECTED ENGINES General Information See Figure 3 The Exhaust Gas Recirculation (EGR) system is used to control emissions measured at the tailpipe. Components included are the EGR valve and controls. The EGR system uses a poppet type valve to regulate the amount of exhaust gas flowing into the intake manifold. The flow path is cast into the cylinder head and does not use any external tubing. A control solenoid valve regulates the amount of vacuum to the EGR valve. A Constant Volume Control (CVC) valve provides a constant amount of vacuum to the control solenoid valve over a wide range of engine vacuum.

1984-1998 Jeep Wagoneer/ Commando/ Cherokee Emission Controls Crankcase Ventilation System (PCV/CCV)

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CCV Fitting See Figures 2 and 3 1. With the engine running, remove the CCV fitting. a. If the fitting is not plugged, a hissing noise will be heard as air passes through the valve. A strong vacuum should also be felt when a finger is placed over the fitting. b. Install the CCV fitting. c. Remove the fresh air hose from the air cleaner assembly and loosely hold a piece of paper over the open end of the hose. After allowing about one minute for the crankcase pressure to reduce, the paper should be sucked against the opening with a noticeable amount of force. 2. Turn the engine OFF . Remove the metered orifice fitting, and check for a plugged condition. A clicking noise should be heard to indicate that the valve mechanism is free. 3. If the crankcase ventilation system meets the tests in Steps 1 and 2 above, no further service is required. If not, the CCV fitting must be cleaned and the system checked again. 4. If Step 1c fails when the CCV fitting is cleaned, it will be necessary to replace the molded vacuum hose with a new one, and to clean the metered orifice port. 5. Clean or replace the engine air cleaner filter element with a new one-for more details, refer to the air cleaner procedure located in General Information & Maintenance. Fig. 2: CCV system diagram for 4.0L engine Fig. 3: CCV system diagram for the 2.5L engine Evaporative Emission Control System OPERATION The evaporative emission control system prevents the release of unburned hydrocarbons, from gasoline or gasoline vapor, into the atmosphere. When pressure in the fuel tank is below 3 psi (20 kPa), the pressure relief/rollover valves open allowing fuel vapors to flow to the evaporative canister where they are absorbed by a charcoal mixture. This prevents excessive pressure buildup in the fuel system. Most canisters are equipped with a calibrated orifice at the inlet to the canister.

1999 Ford Escort/ Tracer Cylinder Head Removal And Installation Manual

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Removal 1. Disconnect the battery ground cable (14301). For additional information, refer to Section 414-01 . 2. WARNING: Fuel supply lines will remain pressurized for long periods of time after engine shut down. This pressure must be relieved before disconnecting any fuel lines or fuel system components. Relieve the fuel system pressure. For additional information, refer to Section 310-00 . 3. Remove the engine air cleaner outlet tube. For additional information, refer to Section 303-03 . 4. Remove the timing belt. For additional information, refer to Timing Drive Components—Timing Belt in this section. 5. Remove the vacuum hoses at the: * positive crankcase ventilation (PCV) valve (6A666). * throttle body (9E926). * intake manifold (9424). * fuel pressure sensor. 6. Disconnect the fuel charging wiring (9D930) electrical connectors at main engine connector. 7. Disconnect the crankshaft position (CKP) sensor electrical connector. 8. Disconnect the fuel line. For additional information, refer to Section 303-04 . 9. Remove the power steering pump (3A674) and bracket as an assembly. For additional information, refer to Section 211-02 . 10. Remove the generator (GEN). For additional information, refer to Section 414-02 . 11. Remove the oil level indicator tube (6754). For additional information, refer to Oil Level Indicator and Tube in this section. 12. Disconnect the heater hoses. For additional information, refer to Section 412-02 . 13. Lower the vehicle. 14. Disconnect the upper radiator hose (8260) from the thermostat housing water hose connection. For additional information, refer to Section 303-03 . 15. Remove the camshafts (6250). For additional information, refer to Camshaft in this section. 16. Remove the ignition coil (12029) and bracket. For additional information, refer to Section 303-07 . 17. Remove the water thermostat housing. For additional information, refer to Section 303-03 . 18. Disconnect the knock sensor electrical connector. 19. Remove the generator bracket-to-cylinder head bolt. 20. Remove the bolts and the cylinder head (6049). 21. Remove the cylinder head gasket and discard. Installation 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 may be ignited, resulting in possible personal injury. 1. CAUTION: Do not use abrasive grinding discs to remove gasket material; use only plastic manual scrapers. Do not scratch or gouge the aluminum sealing surfaces. Clean all gasket material from the mating surfaces on the cylinder head and cylinder block. Clean out the bolt holes in the cylinder block. Inspect the cylinder head for flatness. For additional information, refer to Section 303-00 . 2. Install a new head gasket on the cylinder block. 3. CAUTION: Do not attempt to install the cylinder head assembly without assistance. Installation of the cylinder head assembly requires two people or possible injury may occur. CAUTION: The bolts are torque-to-yield and must be replaced or engine damage may occur. Tighten the bolts in three stages in the sequence shown. * Stage 1: Tighten the bolts to 15-25 Nm (12-18 lb-ft). * Stage 2: Tighten the bolts to 35-45 Nm (26-33 lb-ft). * Stage 3: Tighten the bolts an additional 105 degrees. 4. Install the generator bracket-to-cylinder head bolt. * Tighten to 20 Nm (15 lb-ft). 5. Connect the knock sensor electrical connector. 6. Install the thermostat housing. For additional information, refer to Section 303-03 . 7. Install the ignition coil and bracket. For additional information, refer to Section 303-07 . 8. Install the camshafts. For additional information, refer to Camshaft in this section. 9. Connect the upper radiator hose. For additional information, refer to Section 303-03 . 10. Raise and support the vehicle. For additional information, refer to Section 100-02 . 11. Install the heater hoses. For additional information, refer to Section 412-02 . 12. Install the generator and bracket assembly. For additional information, refer to Section 414-02 . 13. Install the power steering pump and bracket assembly. For additional information, refer to Section 211-02 . 14. Connect the fuel lines. For additional information, refer to Section 310-00 . 15. Connect the crankshaft sensor electrical connector.

2000 Ford Crown Victoria/ Grand Marquis Intake Manifold – Gasoline Engines Removal and Installation Manual

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Intake Manifold—Gasoline Engines Removal 1. Disconnect the battery ground cable. For additional information, refer to Section 414-01 . 2. Drain the engine cooling system. For additional information, refer to Section 303-03 . 3. Remove the air cleaner outlet tube. For additional information, refer to Section 303-12 . 4. Disconnect the fuel line. For additional information, refer to Section 310-00A or Section 310-00B . 5. Remove the wiper arm and pivot shaft. For additional information, refer to Section 501-16 . 6. Remove the drive belt. For additional information, refer to Section 303-05 . 7. Raise the vehicle on a hoist. For additional information, refer to Section 100-02 . 8. Disconnect the electrical connector at the crankshaft position (CKP) sensor. * Disconnect the pin-type retainer from the A/C compressor bracket. 9. Disconnect the electrical connector from the A/C compressor. 10. Remove the oil bypass filter. 11. Disconnect the oil pressure sensor electrical connector and the power steering pressure (PSP) switch electrical connector. 12. Disconnect the exhaust gas recirculation (EGR) tube from the exhaust manifold 13. Lower the vehicle. 14. Disconnect the two differential pressure feedback EGR hoses. 15. Disconnect the RH heated oxygen sensor electrical connector. 16. Disconnect the fuel charging wiring electrical connectors from the eight ignition coils. 17. Disconnect the fuel charging wiring electrical connectors from the eight fuel injectors. 18. Disconnect the accelerator cable and the speed control actuator cable. 19. Remove the cables from the EGR tube heat shield and position out of the way. 20. Remove the bolts and the EGR tube heat shield. 21. Disconnect the evaporative emissions (EVAP) return tube, the main chassis vacuum supply line, and the EGR valve vacuum supply. 22. Disconnect the positive crankcase ventilation (PCV) tube assembly at two locations and remove. 23. Disconnect the electrical connector from the EGR vacuum regulator solenoid. 24. Disconnect the vacuum line from the EVAP canister purge valve. 25. Disconnect the generator cable and electrical connector 26. Remove the bolts and the generator mounting bracket. 27. Remove the upper radiator hose. 28. Disconnect the electrical connector from the idle air control (IAC) valve and the throttle position (TP) sensor. 29. Disconnect the heater water hose. 30. Disconnect the EGR tube from the EGR valve. 31. NOTE: The LH heated oxygen sensor and the transmission electrical connectors are attached to the wiring bracket and must be separated from the bracket. Remove the wiring bracket. * Disconnect the wiring connectors. * Separate the transmission harness from the stud. * Remove the nut and the bolt and remove the bracket.