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2005-2006 Toyota Tundra/ Sequoia 4.7L V8 MR Tech Power-flow Intake system Installation Manual

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Filed Under (Toyota Manuals) by admin on 23-03-2012

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The installation of this cold air intake does require mechanical skills. Removal of engine covers, air lines and removing several plastic plugs and screws that may be difficult. It is recommended that this system be installed by a professional mechanic. Be sure to disconnect the negative terminal before proceeding. Congratulations! You have just purchased the worlds first tuned intake system. MR Technology, Leading the way! Patent pending (A) and (G) (B) (D) (A) Power-Box contents: POWER-FLOW: An air intake evolution Tools required: 1- 8mm socket 1- 10mm socket 1- 12mm socket 1- Phillips screw driver 1- 8mm nut driver 1- 55mm allen wrench 1- Disc grinder or Dremel (C) (E) Figure 1 Figure 2 Carefully, remove the mass air flow sensor from the air sensor housing to be reused later in the instruc- tions. Unhook three spring clamps from the top air box cleaner. Once the hooks have been removed, continue to detach the air box top from the lower air box cleaner. See fig. 15 for better illustration. Once the nut and bolt have been removed, continue to remove the entire hose clamp. Unplug the electrical harness clip from the mass air flow sensor as shown above. Disconnect the 4mm vacuum line located to the side of the air box cleaner. Unscrew the nut and bolt the hose clamp that secures the hose over the radiator. Loosen the two flange nuts on the engine cover in order to remove the cover. Disconnec the 6mm vacuum hose that will be reused later in the instructions. Page 2 of Part# PF2019 Unscrew the two screws from the mass air flow sensor, shown above. Loosen the hose clamp on the air duct connected to the throttle body. Unplug the crank case breather hose from the air crank case port as shown above. >>> >>>> Figure 3 Figure 8 Figure 7 Figure 6 Figure 11 Figure 10 Figure 9 Figure 14 Figure 13 Figure 12 >>>> Figure 4 Figure 5 Once the flange nuts have been removed, continue to remove the cover from the engine compartment as shown above. >>> >>> >>> >>> >>> >>> The three spring clamps shown above are unhooked from the top air box cleaner (A). Remove the air filter panel once the top has been removed (B). Once the air filter panel is removed, there are three bolts that will be removed in order to detach the lower air box cleaner. Remove the entire lower air box cleaner from the engine compartment. Place the power bands over each end of the silicone elbow. press the short end of the silicone elbow over the throttle body. Once the silicone elbow has been aligned continue to semi-tighten power band over the throttle body end. The first vibra-mount is aligned to the pre-tapped hole located behind the head lamp. The first vibra-mount is now installed as shown above. Screw the second vibra-mount is aligned over the wheel well bracket. The second vibra-mount is now installed as shown above. The stock 6mm hose is removed from the fuel pressure regulator. Press the new 16″- 4mm vacuum hose over the fuel pressure regulator port. Page 3 of Part# PF2019 Figure 15 Figure 17 Figure 16 Figure 20 Figure 19 Figure 18 Figure 23 Figure 26 Figure 25 Figure 22 Figure 21 Figure 24 (B) (A) (A) (A) >>> >>> >>> >>> Both vibra-mounts are now installed, you are now ready to go on to the next step. Place one .462 and a .412 power band over the silicone step hose. Press the 3 3/4″ side over the velocity stack as shown above. The Power box is now sitting flush over the vibra- mounts and a fender washer is placed over each vibra-mount. The last m6 flange nut is placed over the vibra- mount located behind the Power box. The 65mm bolt is tightened with an allen wrench. The assembled power box is lowered into the engine compartment. Align the mounting points on the bracket arms over the vibra-mounts. One 45mm bolt is removed from the top of the box. The bracket is place under the Power box and the 45mm bolt is aligned and screwed back in place as shown above. Remove the 65mm bolt from the velocity stack base. Align the bracket to the hole and insert the 65mm bolt back in place

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1999 Chevrolet Silverado The service engine soon light is on with trouble code P1416 present

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Filed Under (Chevrolet Manuals) by admin on 07-05-2012

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Tests/Procedures: 1. Use a scanner and command the air pump on with the engine running at idle. Check if the O2 sensors go lean. 2. If the O2 sensor does not go lean on one bank, see if the check valve at the exhaust manifold is stuck closed, not allowing air into the manifold. Potential Causes: Defective Check Valve Diagnostic Codes: P1416 Author: Christopher Pittman Average Reported Mileage: 85812 Confirmed Fix Summary Confirmed Fix 18 – Air Injection Reaction (AIR) Check Valve 1 – Air Injection Reaction (AIR) Check Valve, Air Injection Reaction (AIR) Pump Confirmed Fix Details Tech Reported Fix Details Confirmed Fix Lee Stroup Sr. November 15, 2007 2001 Chevrolet Silverado 1500, 5.3L, Vin T, Eng Cfg V8 * A.I.R. Check Valve – removed check valves, found one rusted closed, one restricted, replaced both valves. Moisture from exhaust seems to have rusted both valves. Air Injection Reaction (AIR) Check Valve Paul Puleo August 20, 2009 1999 Chevrolet Camaro, Z28 5.7L * Replaced Both Air Injection Reaction (AIR) Check Valves – bank 2 AIR check valve restrticted, bank 1 slightly restricted replaced both Air Injection Reaction (AIR) Check Valve SouthGate January 05, 2009 2000 Chevrolet Silverado 1500, 4.8L, Vin V, Eng Cfg V8 * Replaced Air Injection Reaction (AIR) Check Valve – replaced boht check valves. fix the code. Air Injection Reaction (AIR) Check Valve Dwight Heckman July 31, 2008 2000 Chevrolet Blazer, 4.3L * Check Valve – replacing the check valve and cleaning out the lines repaired the problem. Air Injection Reaction (AIR) Check Valve Nick Secchitano June 16, 2009 2000 Chevrolet Silverado 1500, 5.3L, Vin T, Eng Cfg V8 * Replaced Both Air Injection Reaction (AIR) Check Valves – Air injection check valves Air Injection Reaction (AIR) Check Valve Mark Bertelsen 1998 Chevrolet Camaro, Z28 5.7L * Replaced Air Injection Reaction (AIR) Check

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Toyota Matrix XRS Air Intake Removal And Installation Instructions

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Filed Under (Toyota Manuals) by admin on 10-02-2011

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1. Turn the ignition OFF and disconnect the vehicle’s negative battery cable. 2. Disconnect the mass air sensor electrical connection. 3. Remove the screw that secure the vacuum switching valve to the air cleaner. 4. Remove the stock bracket from the vacuum switching valve. 5. For 2005 and 2006 models, you need to unclip the vacuum switching valve hose from the intake tube, and remove the screw from PWM switching valve. 6. Loosen the clamps at the throttle body and at the air cleaner, then remove the stock intake tube. 7. For 2002 to 2004 models, you need to remove the EVAP OBD canister closed valve vent from the air cleaner. Then unclip the upper air cleaner, then tilt upwards to unclip the PWM vacuum switching valve and the vacuum hose. 8. For 2005 and 2006 models, unclip vacuum switching valve hoses from air box, then unclip the PWM switching valve wire harness from upper airbox. 9. Remove the upper Air cleaner. 10. For 2002 to 2004 models, loosen and remove the bolt that secure the EVAP OBD canister closed valve to the lower air cleaner. 11. Loosen and remove the three bolts that secure the lower air cleaner, then disconnect the vacuum hose from the butterfly valve. 12. Tilt the lower air cleaner upwards to unclip the wire harness. 13. Remove the lower air cleaner. 14. Loosen the battery hold down bracket. 15. Remove the bolt that secures the battery hold down bracket to the radiator core support, then remove the battery hold down bracket. 16. Remove the push clip that secures the air inlet duct to the radiator core support. 17. Loosen and remove the bolt that secures the air inlet duct to the inner fender. 18. Tilt that battery backwards, then remove the air inlet duct. 19. Reinstall the battery hold down bracket. 20. Disconnect two vacuum hoses from the vacuum switching valve. Install of Intake

2000-2004 Toyota Celica GT Air Intake Removal And Installation Guide

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Filed Under (Toyota Manuals) by admin on 05-11-2011

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1. Turn the ignition OFF and disconnect the vehicle’s negative battery cable. 2. Disconnect the mass air sensor electrical connection. 3. Depress the center pins on the push clips on the radiator core support cover. 4. Remove the radiator core support cover. 5. Unclip the relay and fuse box and move out the way. 6. Loosen and remove the bolt on the radiator core support. 7. Unclip the PWM vacuum switching valve from the air cleaner assembly. 8. Pull to remove the computer fresh air tube. 9. Loosen the clamps on the stock intake tube, then remove the stock intake tube. 10. Remove the two stock rubber hoses from the air cleaner lid. 11. Remove the EVAP OBD canister closed valve vent hose from the hard line. 12. Push back, and pull up to gain access to the bottom of the air cleaner assembly. 13. Remove the vacuum hose from the intake manifold. 14. Disconnect the vacuum switching valve electrical connection. 15. Using a pair of pliers unclip the wire harness from the back of the air cleaner assembly. 16. Disconnect the EVAP OBD canister closed valve electrical connection. 17. Remove the complete air cleaner assembly. 18. Disconnect the PWM vacuum switching valve electrical connection. 19. Remove the stock bracket from the PWM vacuum switching valve. 20. Remove the mass air sensor from the air cleaner assembly. 21. Loosen and remove the EVAP OBD canister closed valve from the air cleaner assembly. 22. Disconnect the vacuum hoses from the vacuum switching valve, then remove the vacuum switching valve from the bottom of the air cleaner assembly. 23. Remove the two vent hoses from the EVAP OBD canister closed valve. 24. Install the mass air sensor into the intake tube and secure. 25. Loosen and remove the stock nut on the relay and fuse box support bracket. 26. Install the EVAP OBD canister closed valve assembly into the vehicle and connect the hose to the hard line, then secure the bracket to the relay and fuse box support bracket using the nut removed before

2007 TOYOTA TUNDRA COLD AIR INTAKE Preparation

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Filed Under (Toyota Manuals) by admin on 22-10-2011

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1. Check Box Contents (a) Check box for contents and/or damage. 2. Vehicle Preparation (a) Open vehicle hood. (b) Use blankets or covers to protect the front grille and passenger-side front fender area. Note: For 5.7L installation proceed to next step. For 4.7L installation proceed to step #4 3. Removal Procedure: 5.7L V8 OE Air Inlet System (a) Raise the front of the engine cover to detach the 2 pins (Fig. 3-1). (b) Remove the 2 engine cover hooks from the bracket, and remove the cover (Fig. 3-1). (c) Disconnect the vacuum hose and ventilation hose (Fig. 3-2). (d) Loosen the two 10 mm hose clamps and remove the air cleaner hose (Fig. 3-2). 12 mm Wrench Fig. 3-1 Fig TOYOTA TUNDRA 2007 – COLD AIR INTAKE Procedure Page 3 of 15 pages Issue: A 08/24/07 10mm Socket 10 mm Socket 10 mm Socket 4. Removal Procedure: 4.7L V8 OE Air Inlet System (a) Remove the two 10 mm cap nuts and throttle body cover (Fig. 4-1). (b) Remove air cleaner hose assembly. (1) Disconnect the vacuum hose and No. 2 ventilation hose (Fig. 4-2). (2) Loosen the two 10 mm hose clamps and remove the air cleaner hose (Fig. 4-2). 5. Removal Procedure: 5.7L and 4.7L V8 OE Air Inlet System (a) Remove the air cleaner lid. (1) Disconnect the MAF sensor connector (Fig. 5-1). (2) Using a clip remover, detach the wire harness clamp (Fig. 5-1). (3) Unfasten the 4 hook clamps and then remove the air cleaner lid (Fig. 5-1). (b) Remove OE air filter and save. (c) Remove the two 10 mm bolts and air cleaner case (Fig. 5-2)

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1984-1995 Honda Accord/Prelude In­Tank Fuel Pumps TEST/REPAIR MANUAL

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Filed Under (Honda Manuals) by admin on 03-07-2012

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Carbureted Fuel System GENERAL INFORMATION On these vehicles, the engine management system is considered part of the emission control system. The major components include the carburetor(s), feedback control system, the air injection system, a throttle control system and the EGR system. The system consists of sensors and switches that feed information to the Electronic Control Unit (ECU), which will then operate several solenoid valves to maintain the ideal air/fuel ratio under all conditions. As useful as the tests found in this section are, the first step in repair or service to engine management systems is still to gain as much information as possible about the problem; when and under what conditions it occurs. At highway speed? At idle only? Only under heavy load or hard acceleration? Wet weather? Defining the problem will eliminate many systems from consideration and possibly point to the affected system. Before diving into an extended electrical diagnosis, take the time to review the basics. Check every vacuum line for cracks or leaks. Check every electrical connector for corrosion or loose pins. Quite often, simply unplugging and reconnecting a connector will break up corrosion on the pins and restore the circuit. Watch out for poor grounds, particularly if the car has experienced major bodywork. COMPONENT TESTING Air Injection System The purpose of this system is to supply oxygen to the exhaust stream at a point in the exhaust manifold that is hot enough to burn off some of the hydrocarbon emissions. The main component is an air suction valve. The valve is spring loaded to stay closed, with engine vacuum supplied to a diaphragm that reduces the spring pressure and allows the reeds to open. The ECU regulates the engine vacuum to the diaphragm by operating a solenoid valve. 1. With the engine at normal operating temperature and at idle, remove the air cleaner and listen for a bubbling sound at the air suction port. There should be no sound at idle, meaning the air suction valve is closed. 2. If the noise is heard at the air suction port, disconnect the vacuum hose at the air suction valve and connect a vacuum gauge to the hose. There should be no vacuum. If there is vacuum and the noise stops, the problem is in the control system. If there is no vacuum and the bubbling sound is still there, the air suction valve is defective and must be replaced. 3. To test the valve, draw a vacuum at the air suction valve diaphragm and listen for a bubbling sound at the air suction port. If no sound is heard, the air suction valve or diaphragm is faulty. Throttle Control System

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Toyota Celica 1.8L 16v VVTi INSTALLATION INSTRUCTIONS

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Filed Under (Toyota Manuals) by admin on 29-10-2011

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1. Disconnect the negative terminal from the vehicle battery. 2. Unclip & remove the plastic trim from the front slam panel. (Fig. 1) 3. Unclip & remove the electrical harness plug from the MAS (Mass Air Sensor). (Fig. 2) 4. Unclip the MAS harness from the side of the air box. (Fig. 3) 5. Unclip & remove the intake hose from the MAS / air box lid. (Fig. 4) 6. Remove the vacuum hose from the inlet manifold (small rubber hose between the air box & manifold. (Fig. 5) 7. Fit the rubber blanking plug to the vacuum pipe located on the inlet manifold (ensure an air tight seal. (Fig. 6) 8. Unclip & remove the CFSV (carbon filter solenoid valve) from the air box lid. (Fig. 7) 9. Remove the 2 bolts securing the air box assembly & carefully lift out the assembly (Do not fully remove at this time). (Fig. 8&9) 10. From underneath the air box assembly unclip the blue electrical harness plug from the VSV (Vacuum solenoid valve). Now fully remove the air box assembly. (Fig.10) 11. Refit the plastic trim to the slam panel. 12. Remove the plastic ducting from between the fan cowling & ECU cover. (Fig.11&12) 13. Unclip & remove the intake hose from the throttle housing. (Fig.13) 14. Remove the bolt securing the relay unit to the chassis leg as shown. (Fig.14) 15. Secure the new mounting bracket to the relay mounting point located on the chassis leg using the M8 bolt & washer supplied. (Fig.15) 16. Clip the edge trim to the outside edge of the heat shield, cut away any excess trim. (Fig.16) 17. Attach the heat shield to the mounting bracket & secure using the M6 allen head bolts, nylock nuts & washers supplied. (Fig.17) 18. Unscrew & remove the bracket from the CFSV. (Fig.18) 19. Fit the new ‘L’ mounting bracket to the CFSV using the original screw. (Fig.19) 20. Secure the CFSV / mounting bracket to the side of the heat shield using the M5 bolt, nylock nut & washers supplied. (Fig.20) 21. Carefully unscrew & remove the MAS from the air box assembly. (Fig.21) 22. Stick the foam gasket to the hole located on the new molded intake pipe. Fit the MAS to the hole in the molded intake pipe & secure using the screws supplied. (Fig.22&23) 23. Assemble the new molded intake pipe using the silicone adaptor hose & rubber filter adaptor. (Fig.24) 24. Fit the new K&N filtercharger to the rubber filter adaptor & secure using the hose clamp supplied. (Fig.25) 25. Secure the new intake pipe assembly to the throttle housing using the stepped silicone hose & hose clips supplied (align the notch on the intake pipe with the notch on the throttle housing). (Fig.26) 26. Reconnect the electrical harness plug from the MAS. (Fig.27) 27. Secure the coolant hose & any excess harnesses using the plastic ties supplied. 28. Reconnect the negative battery terminal. 29. Carry out a final check of the alignment / fitment of the K&N induction system. Make any adjustments utilizing the slotted holes on the brackets & shield. Installation is now complete. (Fig.28

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1995-1999 Buick Riviera Steering Vibration/Shudder/Moan During Parking Maneuvers on Dry Pavement (Install Power Steering Pressure (Inlet) and/or Return (Outlet) Hose Assembly)

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Filed Under (Buick Manuals) by admin on 11-02-2012

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1. Verify that the power steering pump reservoir is full. 2. Verify that the accessory drive belt is in good condition and that the pulleys are not bent or damaged. 3. Verify proper belt tension and operation of the belt tensioner. 4. Check for power steering hose ground out conditions. 5. Check for good engine idle and correct engine RPM. 6. Check to see that the rear transaxle mount does not have a plastic assembly aid installed which is used Subject: Steering Vibration/Shudder/Moan During Parking Maneuvers on Dry Pavement (Install Power Steering Pressure (Inlet) and/or Return (Outlet) Hose Assembly) Models: 1995-99 Buick Riviera 1997-2001 Buick Park Avenue, Ultra 2000-2001 Buick LeSabre 2000-2001 Pontiac Bonneville • 1995-98 Buick Riviera • 1997-98 Buick Park Avenue and Ultra • 1999 Buick Riviera • 1999-2001 Buick Park Avenue and Ultra • 2000-2001 Buick LeSabre • 2000-2001 Pontiac Bonneville • If fluid level is low, fill and check for leaks. • If power steering system has air in the system, perform the “Bleeding Air from Power Steering System” procedure as described in the Power Steering System sub-section of the Service Manual. Important: When performing the “Bleeding Air from Power Steering System” procedure, it is important that the front of the vehicle is supported by the lower control arms. If the vehicle is not supported by the lower control arms, the procedure may cause the strut bushing to dislocate and cause new concern. for assembly purposes. If the assembly aid is installed, remove the assembly aid and install the rear transaxle mount. 7. With the vehicle on dry pavement, maneuver the vehicle in parking positions. If the steering vibrates/shudders or moans in this test, replace the power steering pressure hose and/or the harmonic balancer. Important: A defective harmonic balancer on the 1995 Buick Riviera can influence steering vibrations after power steering hose installation. Important: When installing the pressure hose on the 1995 Buick Riviera, pull down on the pressure hose at the rear of the engine or bend the hose to allow clearance between the hose and the front of the dash. Power Steering Pressure (Inlet) Hose Replacement Procedure For 1995-1998 Vehicles: 1. Raise and suitably support the vehicle. Refer to Vehicle Lifting and Jacking in the General Information section of the Service Manual. 2. Drain the power steering fluid. Refer to Draining the Power Steering System in the Power Steering section of the Service Manual. 3. Remove the power steering gear assembly heat shield (1). 4. Disconnect the power steering pressure hose from the power steering pump assembly (4). 5. Remove the bolt/screws from the retaining clips (3). 6. Disconnect the power steering pressure hose from the power steering gear assembly (2). 7. Remove the power steering pressure hose assembly from the vehicle. 8. Install the power steering pressure hose assembly to the vehicle. 9. Connect the power steering pressure hose to the power steering pump assembly (4). 10. Connect the power steering pressure hose to the power steering gear assembly (2). Tighten Tighten the power steering pressure hose to the steering gear to 27 N·m (20 lb ft). 11. Install the bolt/screws to the retaining clips (3). Tighten Tighten the retaining clip bolt/screws to 6 N·m (53 lb in). 12. Install the power steering gear assembly heat shield (1). 13. Lower the vehicle. 14. Fill and bleed the power steering system using, J 43485. Refer to Corporate Bulletin Number 83-32-09, dated November, 1998. Power Steering Pressure (Inlet) and Return (Outlet) Hose Replacement Procedure For 1999-2001 Vehicles: 1. Raise and suitably support the vehicle. Refer to Vehicle Lifting and Jacking in the General Information section of the Service Manual. 2. Drain the power steering fluid. Refer to Draining the Power Steering System in the Power Steering section of the Service Manual. 3. Remove the LH front wheel/tire assembly. 4. Remove the LH lower splash shield. 5. Remove the lower radiator air deflector (engine splash shield, if installed.

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

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Filed Under (Honda Manuals) by admin on 22-04-2012

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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

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2002 BMW 325I 2.5L Air Pump Repair manual

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Filed Under (Bmw Manuals) by admin on 05-02-2012

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Check engine light on and fault codes stored. Vehicle running normally. Tests/Procedures: 1. Based upon stored fault codes for secondary air system, there is little or no flow of secondary air into engine. Typical causes for this issue are failed secondary air pumps and/or secondary air check valves. Secondary air pump should operate under normal circumstances when vehicle is first started to perform system test. Pump will normally be heard running when standing in front right corner of vehicle. 2. The secondary air pump is located in the right front of engine compartment. A secondary air pump relay located in the glove box is controlled by the engine control module and sends power to the secondary air pump. 3. Air pump can be disconnected and supplied with power and ground at pump to verify operation is possible. 4. Check valve on front right of cylinder head can be supplied with vacuum and visually checked for opening of valve. 5. Vacuum line from check valve to operating solenoid should also be inspected for cracks or being disconnected. Vacuum line follows right side of cylinder head to back of cylinder head to the secondary air solenoid located under left rear side of intake manifold. 6. The solenoid should allow vacuum flow to the check valve during vacuum pump operation. The solenoid is controlled directly by the engine control module and receives power during key-on-engine-off. Potential Causes: A.I.R. Check Valve Engine Control Module (ECM) Codes — Engine control module fault. Defective Secondary Air Pump Secondary Air Pump Relay Secondary Air Supply Hose Broken Vacuum Line

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