Why is there oil in my Dodge Intrepid intake manifold plenum

It will not work.

Lower Intake:

1. Use a skin coat of RTV silicone on both sides of the water passage ports (outer most holes) and put the new lower intake gaskets into place
2. Hand tighten the 13mm head intake bolts and Torque the bolts , starting from the center and working your way out in a circular pattern
3. Torque these bolts in a few small increments until they have reached 250 inch pounds of torque.
4. Upper Intake Plenum:
5. When installing the intake air plenum , be sure to catch the four center bolts and the two side bolts (stiffener brackets) before tightening , The center bolts should be torqued to 250 inch pounds .The fuel rail bolts should be torqued to 100 inch pounds

Well basically, you remove the intake plenum and replace the gasket and reinstall the plenum. Here are the steps:

1. Disconnect the negative battery cable from the remote jumper terminal located at the right strut tower.
2. Remove the air inlet resonator and tube.
3. Remove the throttle actuator cables from the throttle arm and bracket.
4. Disconnect Secondary Runner Valve (SRV), Manifold Tuning Valve (MTV), Throttle Position Sensor (TPS), Idle Air Control (IAC) motor electrical connectors.
5. Remove the electrical connector and the Intake Air Temperature/Manifold Absolute Pressure (TMAP) sensor.
6. Disconnect vacuum hoses from the Secondary Runner Valve (SRV) reservoir, Speed Control reservoir, and PCV.
7. Remove right and left intake manifold supports.
8. Remove support brackets at the intake manifold front corners and MTV.
9. Loosen upper fastener attaching throttle body to support bracket.
10. Remove clips attaching EGR tubes to intake manifold.
11. Remove intake manifold bolts and manifold
12. Remove old gaskets, Clean gasket surfaces, and install new gaskets.
13. Reverse steps to reinstall manifold

Well, it's definitely on the intake manifold somewhere. On a Chrysler 2.5L v-6, the IAT is on the upper intake manifold, at the front of the engine (the farthest point from where air enters the intake). This is a transverse engine, but your IAT should be on the intake or plenum.

The MAP sensor mounts to the driver side of the intake manifold plenum.

Removal & Installation

1. Remove the negative battery cable.
2. Disconnect the electrical connector from the MAP sensor.
3. Remove bolts from sensor.
4. Remove sensor.

To install:

1. Bolt sensor to intake.
2. Attach electrical connector to sensor.
3. Install the negative battery cable.

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.

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Hope helps.

Its hidden on the drivers side. its just below the 3rd bolt back for te upper plenum, count the bolts back and look down on the lower intake.

hay bud you just took the top one off go a head and replace the bottom one to because you'll be kicking your self in the but later i promise

Driver side of intake manifold plenum, near dipstick area.

The knock sensor is threaded into the block of the engine, just below where the cylinder head sits. You will need to remove the intake plenum (upper and lower) to access this part.