Upper intake plenum manifold removal,,,got everything I could see,,,is there a bracket or something behind motor by the firewall,,,it stillseems to be on somehow??

Check the back of the intake manifold...they are about 2-3" round, and silver in color.

Hi there:
Check this procedure on 2.5L (VIN N) Engine...

1. Disconnect the negative battery cable.
2. Remove the right side under cover.
3. Remove the speed control vacuum reservoir and related components as required for alternator access.
4. Remove the power steering pump cover.
5. Remove the A/C compressor drive belt.
6. Remove the alternator/power steering pump drive belt.
7. Remove the intake manifold plenum.
8. Remove the upper alternator bracket.
9. Remove the intake manifold plenum stay.
10. Detach the electrical connections at the alternator.
11. Unfasten the upper and lower bolts and remove the alternator. Be very careful not to damage neighboring components while removing the alternator.

Fig. 8: Alternator assembly installation-2.5L engine (VIN N) - Zoom Image link HERE


To install:

1. Connect the wiring to the alternator.
2. Place the alternator on its lower bracket and install the upper and lower bolts finger-tight.
3. Install the upper alternator bracket.
4. Install the alternator/power steering pump belt, making sure it is properly seated.
5. Adjust the drive belt to the correct tension using the belt adjuster, then tighten the upper mounting bolt to 16 ft. lbs. (22 Nm) and the lower mounting bolt to 30 ft. lbs. (41 Nm).
6. Install the intake manifold plenum.
7. Install the intake manifold plenum stay.
8. Install the A/C compressor drive belt.
9. Install the power steering pump cover.
10. Connect the negative battery cable.
11. Check the charging system operation.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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

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.

Hello,

Here is a detailed summary on the procedure of how to replace the intake manifold gasket on a 1996 gmc jimmy;
REMOVING THE UPPER INTAKE MANIFOLD(PLENUM)
STEP 1 Disconnect Battery (may not be absolutely necessary, but a good practice to avoid shorting a positive wire to ground).


STEP 2 Remove serpentine belt.

STEP 3 Drain the coolant.

STEP 4 Remove air cleaner ducting and disconnect wires.

STEP 5 Disconnect throttle linkage and bracket.

STEP 6 Disconnect cruise control cable.

STEP 7 Remove brake booster vacuum hose at manifold.

STEP 8 Remove PCV hose.

STEP 9 Remove ignition coil and bracket.

STEP 1O Remove purge solenoid and bracket.

STEP 11 Relieve fuel pressure at test port.

STEP 12 Remove fuel lines and bracket.

STEP 13 Remove upper intake manifold.

REMOVING THE LOWER INTAKE MANIFOLD
STEP 1 Remove the distributor and label the spark plug wires.

STEP 2 Remove heater hoses and bypass hose.

STEP 3 Remove upper radiator hose.


STEP 4 Remove EGR valve?

STEP 5 Remove sensors and bracket on right side.

STEP 6 Remove EGR tube, clamp and bolt.

STEP 7 Remove PCV valve (and replace).

STEP 8 Unbolt A/C compressor and move it aside.

STEP 9 Loosen compressor bracket and slide forward, but do not remove it.

STEP 10 Remove alternator bracket bolt (or remove alternator and set aside)

STEP 11 Unplug all vacuum lines from intake manifold.


STEP 12 Unplug all electrical connectors from manifold.

STEP 13 Take note of the intake manifold bolts and mark the location of the bolts.


STEP 14 Remove intake manifold bolts, and manifold.

STEP 15 Clean mating surfaces

THE MAIN INSTALLATION
STEP1 Set the new gaskets in place and apply silicone to flat areas on front and rear of engine block.

STEP2 Apply thread locking compound to manifold bolts.

STEP 3 Install the manifold and tighten bolts to 35 ft-lbs, in proper sequence.

STEP4 Install the distributor.

STEP5 Install the upper intake manifold.



The remaining installation procedures are basically the reverse of removal.


Have a nice day.

Hi!!
These are the steps to follow to remove the Starter Motor and the Intake Manifold. If you follow them you'll have no problems when the job is done. Pay special attention to the pre-installation steps for the Intake Manifold.

To Replace the Starter, Remove or disconnect the following:

1. Negative battery cable
2. Intake manifold
3. Starter electrical connectors
4. Starter motor

View of starter motor removal and wires


To install, Install or connect the following:

1. -S- terminal wire. Torque the nut to 35 inch lbs. (4 Nm).
2. Starter electrical connectors. Torque the nut to 89 inch lbs. (10 Nm).
3. Starter motor
4. Mounting bolts. Torque the bolts to 22 ft. lbs. (30 Nm).
5. Intake manifold
6. Negative battery cable

INTAKE MANIFOLD
PRIOR TO REMOVAL:

• Relieve the fuel system pressure
• Drain the cooling system.

Remove or disconnect the following:

1. Negative battery cable
2. Intake manifold heat shield
3. Sight shield
4. Coil module connectors from the coil modules located on the valve covers
5. Positive Crankcase Ventilation (PCV) hose and valve from the valve cover
6. Fuel regulator vacuum tube
7. Vacuum tubes from the AIR solenoid
8. Fuel inlet and return lines
9. Fuel rail bracket retaining nut at the rear lift bracket
10. 2 pushnuts attaching the engine coolant heater wire and set it aside, if equipped
11. Fuel injector electrical connections
12. Fuel rail and injectors
13. Plenum duct clamp at the rear of the intake manifold, loosen Intake manifold bolts and the manifold
14. Clean the manifold mating surfaces.

Intake manifold torque sequence- 4.6L engines




PRIOR TO INSTALL:

• Grease the inside edge of the rubber plenum duct.
• Position the intake manifold by performing the following sub-steps:
• Place the rear of the intake manifold into the plenum duct.
• Place the front of the intake manifold downward on to the cylinder heads.
• 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.
• 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).

Install or connect the following:

1. Fuel rail and injectors and tighten the rail retainers to 89 inch lbs. (10 Nm)
2. Fuel injector electrical connections
3. Alternator coolant pipe/surge tank pipe and position onto the fuel rail studs
4. Engine coolant heater wire onto the studs and install the pushnuts, if equipped
5. Fuel rail bracket retaining nut at the rear lift bracket and tighten to 89 inch lbs. (10 Nm)
6. Fuel inlet and return lines
7. Vacuum tubes to the AIR solenoid
8. Fuel regulator vacuum tube
9. Positive Crankcase Ventilation (PCV) valve and hose to the valve cover
10. Coil module connectors to the coil modules located on the valve covers
11. Sight shield
12. Intake manifold heat shield
13. Negative battery cable
14. Fill and bleed the cooling system.

Good Luck!! A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa.

need more info, what size engine? what model need that to send u the correct RnR of the upper plenum

here is the 3.5L version of removal:

1. Disconnect and isolate the negative battery cable.
2. Disconnect the Inlet Air Temperature (IAT) sensor electrical connector
3. Remove the air inlet hose from the throttle body.
4. Disconnect the Manifold Absolute Pressure (MAP) sensor electrical connector.
1. Disconnect the PCV hose ,purge hose and power brake booster hose from the upper intake manifold.
2. Disconnect the electrical connector from the electronic throttle control .
3. Remove the fasteners from the throttle body and cylinder head and remove the throttle bracket.
4. Remove the wiper module, strut tower support and EGR tube
5. Disconnect the electrical connectors from the manifold tuning valve
1. Remove the fasteners , from the intake manifold support brackets.
2. Remove the upper intake manifold retaining bolts, insulation foam pad and manifold. Clean all gasket sealing surfaces.

Bonneville, LeSabre, Park Avenue 2000-2005 Intake Manifold - Removal & Installation

3.8L Engine
VIN 1 Engine

1. Before servicing the vehicle, refer to the Precautions section.
2. Relieve the fuel system pressure.
3. Drain the cooling system.
4. Remove or disconnect the following:
   Negative battery cable Supercharger Thermostat housing Exhaust Gas Recirculation (EGR) tube at the intake manifold Engine Control Temperature (ECT) sensor Intake manifold

To install:

1. Install or connect the following:
   Intake manifold with new gaskets. Torque the bolts, working from the center out, to 11 ft. lbs. (15 Nm). ECT sensor connector EGR tube to the intake manifold Thermostat housing Supercharger Negative battery cable
2. Refill and bleed the cooling system.
3. Run the engine and check for leaks and proper engine operation.

VIN K Engine

1. Before servicing the vehicle, refer to the Precautions section.
2. Disconnect the negative battery cable.
3. Drain the cooling system.
4. Relieve the fuel system pressure.
5. Remove or disconnect the following:
   Fuel injector sight shield Air inlet duct Spark plug wires from the right side Manifold Absolute Pressure (MAP) sensor Vacuum lines from the intake manifold Fuel lines Fuel injector electrical connectors Fuel regulator vacuum line Fuel rail from the intake manifold Exhaust Gas Recirculation (EGR) heat shield Throttle cable bracket from the cylinder head mounting bracket and the throttle body cables Throttle body support bracket Upper intake plenum and gasket Thermostat housing Electrical connector from the Engine Coolant Temperature (ECT) sensor Drive belt tensioner assembly EGR valve outlet pipe Lower intake manifold
   
   
   Fig. Exploded view of the intake manifold and related components-3.8L (VIN K) engine
   

To install:



Fig. Upper intake manifold torque sequence-3.8L (VIN K) engine



Fig. Lower intake manifold torque sequence-3.8L (VIN K) engine

1. Install or connect the following:
   Intake manifold using new manifold gaskets. Torque the bolts in sequence to 11 ft. lbs. (15 Nm); then, re-torque to 11 ft. lbs. (15 Nm). EGR valve outlet pipe Drive belt tensioner assembly. Torque the tensioner bolts to 37 ft. lbs. (50 Nm). Electrical connector to the ECT sensor Thermostat housing Upper intake plenum. Torque the intake plenum bolts to 88 inch. lbs. (10 Nm). Throttle body support bracket Throttle cable bracket to the cylinder head mounting bracket and the cables to the throttle body lever EGR heat shield Fuel rail. Torque the fuel rail bolts to 88 inch. lbs. (10 Nm). Fuel lines Fuel regulator vacuum line Fuel injector electrical connectors Vacuum lines to the intake manifold MAP sensor Spark plug wires Fuel injector sight shield and air inlet duct Negative battery cable
2. Refill and bleed the cooling system.
3. Run the engine and check for leaks and proper engine operation.

Hope this help (remember rated this).

3.8L Engine

NOTE The 3.8L (VIN K) non-supercharged engine uses a two-piece intake manifold consisting of an upper air plenum which mounts the throttle body and a lower intake manifold assembly which houses the fuel injectors. The 3.8L (VIN 1) supercharged engine uses a similar lower intake manifold. The supercharger serves as the upper manifold.
Lower Manifold

NOTE Two bolts which fasten the lower intake manifold to the cylinder head are accessible only after the upper intake manifold is removed. These bolts are located in the right front and left rear corners of the lower intake manifold. Remove the upper intake manifold to service the lower intake.
The 3.8L (VIN 1) supercharged engine uses a manifold similar to the 3.8L (VIN K), but the supercharger serves as the upper manifold.

1. Disconnect the negative battery cable.
2. On 3.8L (VIN 1) engines, remove the supercharger assembly. Please see the procedure in this section.
3. Remove the upper intake manifold using the procedure above.
4. Remove the EGR outlet pipe from the intake manifold.
5. Detach the engine coolant temperature sensor wiring harness from the sensor.
6. Remove the lower intake manifold bolts and carefully lift off the manifold.

To install:


Fig. Lower intake manifold bolt torque sequence-3.8L (VIN K) engine

1. Clean all parts well with degreaser, especially the gasket seal surfaces on the upper and lower manifold pieces and between the lower manifold and the cylinder heads..
2. Install new gaskets to the cylinder heads and new seals to the engine block. Carefully lower the manifold into place. Apply thread-locking compound to the bolt threads. Make sure to install the two hidden bolts in the lower intake manifold. Hand start all bolts, then torque evenly to 11 ft. lbs. (15 Nm). Follow the toque sequence, starting in the center, then working outwards in a circle.
3. Install the remaining components in the reverse order of the removal process.

Upper Intake Manifold (Plenum)

1. Disconnect the negative battery cable.
2. On 3.8L (VIN 1) engines, remove the supercharger assembly. Please see the procedure in this section.
3. Tag for identification, then remove the right side spark plug wires.
4. Disconnect the ignition wires from the fuel rail.
5. Remove the fuel rail. Please see Section 5.
6. Remove the cable bracket from the intake manifold.
7. Remove the throttle body.

NOTE Two bolts which fasten the lower intake manifold to the cylinder head are accessible are accessible only after the upper intake manifold is removed. These bolts are located in the right front and left rear corners of the lower intake manifold.

1. Remove the upper intake manifold bolts and carefully lift the upper intake manifold from the engine.

Fig. Upper intake manifold and bolt torque sequence-3.8L (VIN K) engine
To install:

1. Clean all parts well with degreaser, especially the gasket seal surfaces on the upper and lower manifold pieces.
2. Install new gaskets to the cylinder heads and new seals to the engine block. Carefully lower the manifold into place. Make sure to install the two hidden bolts in the lower intake manifold. Hand start all bolts, then torque evenly to 89 inch lbs. (10 Nm). Follow the torque sequence, starting in the center, then working outwards in a circle.
3. Install the remaining components in the reverse order of the removal process.

Here's how I do it: -Pull the coils out on the front bank and change those first 'cause they're easy.
-Remove air box top and intake tube from throttle body as a unit by removing 10mm bolts in air box and 10mm clamp on throttle body (unplug MAF sensor too)
-Unbolt brackets from rear of upper intake (one of them actually has to come off...the one on the left, I think...). 
-Unplug all the assorted gizmo's on the plenum, and the wiper motor plug (it's sort of in the way...). The connectors are all different so there's no worry about mixing them up...
-Unbolt all of the visible 10mm bolts on top of the intake plenum that hold on ground wires and cable brackets, etc.
-Undo the plenum bolts (12mm), keeping care not to lose the lock washers from the two nuts on either end (warning, us a rag to cover the intake ports). 
-As far as I can remember, you should now be able to lift the plenum up and to your right enough to get at the rear plugs. You shouldn't need to remove anything from the throttle body (cable, connectors, coolant lines...). It can be held up with a bungee cord or something. Or perhaps an assistant...
-After changing plugs, assembly is reverse of removal. You can replace the gasket between the upper and lower intake if you wish, but it's metal and usually in quite good condition. Good luck and hope this helps.