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Home >> Chevrolet >> 1992 >> Camaro V6-191 3.1L >> Repair and Diagnosis >> Powertrain Management >> Fuel Delivery and Air Induction >> Intake Air Plenum >> Service and Repair
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Intake Air Plenum: Service and Repair




Removing the fuel rail assembly from the engine requires removing the top portion of the tuned intake manifold, called the "plenum."

REMOVE OR DISCONNECT:

1. Negative battery terminal.
2. Vacuum lines, noting positions of hoses.
3. EGR to plenum nuts.
4. Two throttle body attaching bolts, throttle body and gasket. Discard gasket.
5. Throttle cable bracket bolts.
6. Ignition wire plastic shield bolts.
7. Plenum bolts.
8. Plenum and gaskets. Discard gaskets.

NOTE: Use care in cleaning old gasket material from machined aluminum surfaces. Sharp tools may damage sealing surfaces.

INSTALL OR CONNECT:

1. New plenum gaskets.
2. Plenum.
3, Plenum bolts. Tighten plenum bolts to 10 N-m (88 lb. in.).
4. Ignition wire plastic shield bolts.
5. Throttle body with new gasket.
6. Throttle body bolts. Tighten throttle body bolts to 25 N-m (18 lb. ft.).
7. EGR to plenum nuts.
8. Throttle cable bracket bolts.
9. Vacuum lines.
10. Negative battery terminal.
11. With the engine "OFF," check to see that the accelerator pedal is free: Depress pedal to the floor and release.
12. Perform the "Idle Learn Procedure." The ECM will need to relearn the IAC valve pintle position following battery reconnect.




Air Plenum And Fuel Rail Removal:






REMOVAL:

1. Disconnect the negative battery cable.
2. Disconnect the vacuum lines, making note of their positions.
3. Remove the EGR to plenum nuts.
4. Remove the two throttle body attaching bolts, throttle body and gasket, discard gasket.
5. Remove the throttle cable bracket bolts.
6. Remove the ignition wire plastic shield bolts.
7. Remove the plenum bolts.
8. Remove the intake manifold plenum and gaskets, discard gaskets.
9. Clean the gasket sealing surfaces.

INSTALLATION:

1. Locate the new plenum gaskets on the intake manifold.
2. Install the intake manifold plenum on the intake manifold.
3. Install the plenum mounting bolts and tighten to 21 N-m (16 lb. ft.).
4. Install the ignition wire plastic shield bolts.
5. Position the throttle body in place and tighten the bolts to 25 N-m (18 lb. ft.).
6. Mount the EGR valve on the plenum and tighten the nuts.
7. Install the throttle cable bracket and bolts, tighten.
8. Connect the vacuum lines.
9. Connect the negative battery cable.

IDLE LEARN PROCEDURE: Any time the battery is disconnected, the programmed position of the IAC valve pintle is lost, and replaced with a default value. To return the IAC valve pintle to the correct position, perform the following procedure:

1. After restoring battery power, connect the Tech 1 "SCAN" tool.
2. Select "IAC SYSTEM," then select "IDLE LEARN" in the "MISC TEST" mode.
3. Proceed with idle learn as directed.
^ This procedure allows the ECM memory to be updated with the correct IAC valve pintle position, for the vehicle, and provide a stable idle speed.
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