Location of vacuum lines

Fords are notorious for bad vacuum lines. Mostly the elbows that are preformed. These just don't stand up to oil or any chemical. These are located any place on the plenum. Some are on the bottom. Hard to get to, but not impossible. Usually the are the large ones that go bad first. Look for the vacuum line s and follow them back to the intake plenum. Sorry you had to replace the MAF...The O2 codes are from the ECM trying to compensate for the extra air coming in...

pcv valve -positive crank ventilation valves are usually located on the valve cover and have a vacuum line that leads to the intake plenum or air inlet just before the throttle body in the diagram below it is the part labeled number 1

Whistle noise indicates a major vacuum leak. Maybe something loose in the intake system. Maybe a vacuum hose disconnected. Will explain lose of power also.

Hi, I have pasted the procedure from autozone.com below. Because this requires removal of the intake manifold, please be as sure as possible that your starter needs replacement. If you have any doubt, please let me know what your symptoms are and what troubleshooting you have done that led you to believe your starter is bad. Also, if you have any questions about the procedure below, please let me know. Thanks for using FixYa.

Removal & Installation

Disconnect the Negative battery cable

Relieve the fuel system pressure (you can do this by placing a rag over the schrader valve on the fuel rail and pressing in the valve stem--just be careful not to spray fuel on your eyes).

Drain the cooling system.

Remove or disconnect the following:

• Intake manifold heat shield

• Sight shield
• Coil module connectors from the coil modules located on the valve covers

• Positive Crankcase Ventilation (PCV) hose and valve from the valve cover
• Fuel regulator vacuum tube
• Vacuum tubes from the AIR solenoid
• Fuel inlet and return lines
• Fuel rail bracket retaining nut at the rear lift bracket
• 2 pushnuts attaching the engine coolant heater wire and set it aside, if equipped
• Fuel injector electrical connections
• Fuel rail and injectors
• Plenum duct clamp at the rear of the intake manifold, loosen
• Intake manifold bolts and the manifold

Clean the manifold mating surfaces.

Remove or disconnect the following:
Starter electrical connectors Starter motor

Fig. View of starter motor removal and wires

To install:

Install or connect the following:

• -S- terminal wire. Torque the nut to 35 inch lbs. (4 Nm).
• Starter electrical connectors. Torque the nut to 89 inch lbs. (10 Nm).
• Starter motor
• Mounting bolts. Torque the bolts to 22 ft. lbs. (30 Nm).

Fig. Intake manifold torque sequence- 4.6L engines

1. Grease the inside edge of the rubber plenum duct.
2. Position the intake manifold by performing the following sub-steps:
   1. Place the rear of the intake manifold into the plenum duct.
   2. Place the front of the intake manifold downward on to the cylinder heads.
   
   
3. Install the intake manifold bolts and torque to 89 inch lbs. (10 Nm) in the sequence illustrated. DO NOT torque the intake manifold bolts when the engine is HOT or at operating temperature.
4. Make sure the plenum duct is fully attached to the rear of the intake manifold and tighten the plenum duct clamp to 20 inch lbs. (2.25 Nm).
5. Install or connect the following:
   
   Fuel rail and injectors and tighten the rail retainers to 89 inch lbs. (10 Nm) Fuel injector electrical connections Alternator coolant pipe/surge tank pipe and position onto the fuel rail studs Engine coolant heater wire onto the studs and install the pushnuts, if equipped Fuel rail bracket retaining nut at the rear lift bracket and tighten to 89 inch lbs. (10 Nm) Fuel inlet and return lines Vacuum tubes to the AIR solenoid Fuel regulator vacuum tube Positive Crankcase Ventilation (PCV) valve and hose to the valve cover Coil module connectors to the coil modules located on the valve covers Sight shield Intake manifold heat shield Negative battery cable
   
6. Fill and bleed the cooling system.

Exactly what is the wrong? Need the part? Need to know torque adjust or porcedure to take off?

For 1994 Pontiac Grand Am 3.1L SFI OHV 6cyl check this procedure for Intake Manifold...
(see Figure 14)
The 3.1L engine is equipped with upper and lower intake manifolds. The upper intake manifold is also known as the intake manifold plenum.

CAUTION The fuel system is under pressure and must be properly relieved before disconnecting the fuel lines. Failure to properly relieve the fuel system pressure can lead to personal injury and component damage.

1. Relieve the fuel system pressure.
2. Disconnect the negative battery cable.
3. Remove top half of the air cleaner assembly and throttle body duct.
4. Drain and recycle the engine coolant.
5. Disconnect the EGR pipe from exhaust manifold.
6. Remove the serpentine belt.
7. Remove the brake vacuum pipe at the intake plenum.
8. Disconnect the control cables from the throttle body and intake plenum mounting bracket.
9. Remove the power steering lines at the alternator bracket.
10. Remove the alternator.
11. Label and disconnect the ignition wires from the spark plugs and wire retainers on the intake plenum.
    
12. Remove the ignition assembly and the EVAP canister purge solenoid together.

Fig. 14: View of the intake manifold and related components

1. Disconnect the upper engine wiring harness connectors at the following components:
   Throttle Position Sensor (TPS) Idle Air Control (IAC) Fuel Injectors Coolant temperature sensor Manifold Absolute Pressure (MAP) sensor Camshaft Position (CMP) sensor
2. Tag and disconnect the vacuum lines from the following components:
   Vacuum modulator Fuel pressure regulator PCV valve
3. Disconnect the MAP sensor from upper intake manifold.
4. Remove the upper intake plenum mounting bolts and lift off the plenum.
5. Disconnect the fuel lines from the fuel rail and bracket.
6. Install engine support fixture special tool J 28467-A or an equivalent.
7. Remove the right side engine mount.
8. Remove the power steering mounting bolts and support the pump out of the way without disconnecting the power steering lines.
9. Disconnect the coolant inlet pipe from the outlet housing.
10. Remove the coolant bypass hose from the water pump and the cylinder head.
11. Disconnect the upper radiator hose at thermostat housing.
12. Remove the thermostat housing.
13. Remove both rocker arm covers.
14. Remove the lower intake manifold bolts. Make sure the washers on the four center bolts are installed in their original locations.
    

When removing the valve train components they should be kept in order for installation the original locations.

1. Remove the rocker arm retaining nuts or bolts and extract the rocker arms and pushrods.
2. Remove the intake manifold from the engine. Remove and discard the gasket.
3. Using a suitable scraper, clean gasket material from all mating surfaces. Remove all excess RTV sealant from front and rear ridges of cylinder block
   

To install:

1. Place a 0.12 inch (3mm) bead of RTV, on each ridge, where the front and rear of the intake manifold contact the block.
2. Using a new gasket, place the intake manifold on the engine.
3. Install the pushrods in their original locations. Coat the pushrods with prelube.

The intake pushrods are marked yellow (5 3 /4 inch long) and the exhaust are green (6 inches long). Make sure the pushrods are properly seated in the valve lifters and rocker arms.

1. Position the rocker arms in there original locations and tighten to specifications. Refer to the procedure earlier in this section.
2. Install lower the intake manifold attaching bolts. Apply sealant 12345739 (or equivalent thread locking compound) to the threads of bolts. Tighten the vertical bolts first then the diagonal bolts to 115 inch lbs. (13 Nm).
3. Install the front rocker arm cover.
4. Install the thermostat housing.
5. Connect the upper radiator hose to the thermostat housing.
6. Fasten the coolant inlet pipe to thermostat housing.
7. Connect coolant bypass pipe at the water pump and cylinder head.
8. Install the power steering pump in the mounting bracket.
9. Loosely install the serpentine belt.
10. Connect the right side engine mount.
11. Remove the special engine support tool.
12. Fasten the fuel lines to fuel rail and bracket.
13. Install the upper intake manifold and tighten the mounting bolts to 18 ft. lbs. (25 Nm).
14. Install the MAP sensor.
15. Connect the upper engine wiring harness connectors to the related components removed earlier.
16. Connect the vacuum lines to the PCV, vacuum modulator and fuel pressure regulator.
17. Install the EVAP canister purge solenoid and ignition assembly.
18. Install the alternator assembly.
19. Connect the power steering line to the alternator bracket.
20. Install the serpentine belt.
21. Connect the spark plug wires to the spark plugs and intake plenum wire retainer.
22. Install the EGR pipe to the exhaust manifold.
23. Attach the control cables to the throttle body lever and upper intake plenum mounting bracket.
24. Install air intake assembly and top half of the air cleaner assembly.
25. Install the brake vacuum pipe.
26. Fill the cooling system.
27. Connect the negative battery cable, then start the vehicle and verify that there are no leaks.

For PARTS REPLACEMENT check in THIS LINK: carpartswholesale.com

Hope helps.

The fuel pressure regulator for this vehicle is located inside of the air intake plenum, you must remove the plenum to gain access to it.I hope I could help, rate me accordingly, Thanks!!

For Hyundai Car 1999-05 - Intake Air Temperature (IAT) Sensor Location (check several options):

1.- The IAT sensor is located against the firewall to the left side of the engine. It is combined with the Manifold Absolute Pressure (MAP) sensor.

2.- This sensor is located in the air intake plenum assembly. On some vehicles this sensor is combined with the MAP/MAF sensor.

3.- The IAT sensor is located in the air plenum assembly. On some vehicles it is combined with the MAF sensor.

4.- This sensor is located in the air intake plenum assembly. On some vehicles this sensor is combined with the MAP/MAF sensor.

5.- This sensor is located in the air intake plenum assembly. It is combined with the Manifold Absolute Pressure (AFS) sensor.

6.- This sensor is located in the air intake plenum assembly. It is combined with the Manifold Absolute Pressure (AFS) sensor.


In the next graphic, check the position 2...



FIG : Underhood sensor locations-Elantra 2004-2005 2.0L engine


Hope this help (remember comment and rated this) TY for using Fixya.

first you have to diconnect throttle cable and trans kick down from throttle body. than disconnect wires and vacuum hoses and remove upper intake manifold plenum. that should give you access to valve covers . Remove bolts from covers and change gaskets. also replace the gasket on the upper intake plenum. install items in reverse order of removal. keep track of vacuum lines where the go when you remove . mark with tape their location.

U need o repair the pcv vacuum source it is the cause of the oil consumption, which is excessive crankcase pressure.

on the air filter intake hose