Exhaust Manifold Removal - Right (with RPO NC1 or NF7)

Important:  It is difficult to mount the engine on an engine stand with the exhaust manifold/crossover pipe in place. When the engine is out of the vehicle, properly support the engine on the floor or bench and remove the exhaust manifold before mounting the engine on an engine stand.

1. Disconnect the vacuum tube (1) from the right A.I.R. control valve.
2. Disconnect the vacuum tubes (2) from the vacuum solenoid.
3. Remove the vacuum tube harness.
   Fig 1: Removing Vacuum Tube Harness

   Courtesy of GENERAL MOTORS CORP.
4. Remove the right A.I.R. control valve pipe bolt and nut from the right A.I.R. manifold.
   Fig 2: Removing Right A.I.R. Control Valve Pipe From Right A.I.R. Manifold

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5. Remove the right A.I.R. control valve bolts.
6. Remove the right A.I.R. control valve.
   Fig 3: Removing Right A.I.R.

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7. Remove the right A.I.R. manifold bolts.
8. Remove the right A.I.R. manifold.
9. Remove and discard the A.I.R. manifold gasket.
   Fig 4: Removing Right A.I.R. Manifold & Gasket

   Courtesy of GENERAL MOTORS CORP.

   Important:  The EGR valve inlet pipe incorporates a crush seal connection at the water crossover. The EGR valve inlet pipe must be replaced if disconnected from the water crossover.

10. Disconnect the EGR valve inlet pipe from the exhaust crossover pipe (3).
11. Remove the EGR valve inlet pipe to water crossover bolt (2).
12. Remove the EGR valve inlet pipe (1).
    Fig 5: Removing EGR Valve Inlet Pipe

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13. Remove the oxygen sensor (1) from the manifold. Inspect the oxygen sensor for excessive deposits or damage. Replace the oxygen sensor if necessary.
    Fig 6: Removing Oxygen Sensor From Manifold

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14. Remove the right exhaust manifold bolts.

    Important:  DO NOT reuse the exhaust manifold gasket.

15. Remove the right exhaust manifold and exhaust manifold gasket.
    Fig 7: Removing Right Exhaust Manifold & Gasket

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16. Disconnect the engine wiring harness from the knock sensor.
17. Remove the engine wiring harness from the wiring harness bracket (1).
    Fig 8: Removing Engine Wiring Harness From Bracket

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18. Remove the engine wiring harness from the lower crankcase.
    Fig 9: Removing Engine Wiring Harness From Lower Crankcase

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19. Disconnect the engine wiring harness from the ECT sensor.
20. Remove the engine wiring harness.
    Fig 10: Removing Engine Wiring Harness

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21. Remove the ECT sensor.
    Fig 11: Removing ECT Sensor

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22. Remove the oil pressure switch.
    Fig 12: Removing Oil Pressure Switch

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23. Remove the wiring harness bracket bolt.
24. Remove the wiring harness bracket.
    Fig 13: Removing Wiring Harness Bracket

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25. Remove the knock sensor.
    Fig 14: Removing Knock Sensor

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26. Remove the right engine coolant heater bolt.
27. Remove the right engine coolant heater.
    Fig 15: Removing Right Engine Coolant Heater

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