GM Service Manual Online
For 1990-2009 cars only

Exhaust Manifold Heat Shield Replacement - Left Side LY7

Removal Procedure


    Object Number: 1836230  Size: SH
  1. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement.
  2. Disconnect the engine wiring harness electrical connector (3) from the heated oxygen sensors (HO2S) electrical connector (2).

  3. Object Number: 1888019  Size: SH
  4. Remove the exhaust manifold heat shield bolts (1).
  5. Remove the exhaust manifold heat shield (2).

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1888019  Size: SH
  1. Install the exhaust manifold heat shield (2).
  2. Install the exhaust manifold heat shield bolts (1).
  3. Tighten
    Tighten the bolts 22 N·m (16 lb ft).


    Object Number: 1836230  Size: SH
  4. Connect the engine harness electrical connector (1) to the HO2S (2).
  5. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement.

Exhaust Manifold Heat Shield Replacement - Left Side LZ4

Removal Procedure


    Object Number: 1883806  Size: SH
  1. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement .
  2. Remove the connector position assurance (CPA) retainer.
  3. Disconnect the engine wiring harness electrical connector (3) from the heated oxygen sensors (HO2S) electrical connector (2).

  4. Object Number: 1889466  Size: SH
  5. Remove the exhaust manifold heat shield bolts (1).
  6. Remove the exhaust manifold heat shield (2).

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1889466  Size: SH
  1. Install the exhaust manifold heat shield (2).
  2. Install the exhaust manifold heat shield bolts (1).
  3. Tighten
    Tighten the bolts 22 N·m (16 lb ft).


    Object Number: 1883806  Size: SH
  4. Connect the engine harness electrical connector (1) to the HO2S (2).
  5. Install the CPA retainer.
  6. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement .

Exhaust Manifold Heat Shield Replacement - Left Side LY7 or LCS

Removal Procedure


    Object Number: 1836230  Size: SH
  1. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement.
  2. Disconnect the engine wiring harness electrical connector (3) from the heated oxygen sensors (HO2S) electrical connector (2).

  3. Object Number: 1888019  Size: SH
  4. Remove the exhaust manifold heat shield bolts (1).
  5. Remove the exhaust manifold heat shield (2).

Installation Procedure

    Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1888019  Size: SH
  1. Install the exhaust manifold heat shield (2).
  2. Install the exhaust manifold heat shield bolts (1) and tighten to 22 N·m (16 lb ft).

  3. Object Number: 1836230  Size: SH
  4. Connect the engine harness electrical connector (1) to the HO2S (2).
  5. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement.

Exhaust Manifold Heat Shield Replacement - Left Side LZ4

Removal Procedure


    Object Number: 1883806  Size: SH
  1. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement.
  2. Remove the connector position assurance (CPA) retainer.
  3. Disconnect the engine wiring harness electrical connector (3) from the heated oxygen sensors (HO2S) electrical connector (2).

  4. Object Number: 1889466  Size: SH
  5. Remove the exhaust manifold heat shield bolts (1).
  6. Remove the exhaust manifold heat shield (2).

Installation Procedure

    Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1889466  Size: SH
  1. Install the exhaust manifold heat shield (2).
  2. Install the exhaust manifold heat shield bolts (1) and tighten to 22 N·m (16 lb ft).

  3. Object Number: 1883806  Size: SH
  4. Connect the engine harness electrical connector (1) to the HO2S (2).
  5. Install the CPA retainer.
  6. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement.