GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Chevrolet C-Series Medium Duty Truck B7 🢒 Engine 🢒 Engine Electrical 🢒 Exhaust Gas Recirculation Valve Replacement

Removal Procedure
  1. Remove the air cleaner.
  2. Disconnect the EGR valve vacuum tube at the valve.

    3. Object Number: 312255 Size: SH
  3. Remove the bolts or the nuts (4).
  4. Remove the EGR valve (1) and the gasket (2) from the manifold.

    5. Discard the gasket.

Cleaning and Inspection Procedure

    Important: Do not wash the EGR valve in solvents or a degreaser -- permanent damage to the valve diaphragm may result. Do not sand blast the valve because this can affect the operation of the valve.

  1. If EGR manifold passage indicates an excessive build-up of deposits, clean the passage. Remove all loose particles in order to prevent them from clogging the EGR valve or from being ingested into the engine.
  2. With a wire wheel, buff the exhaust deposits from the mounting surface and around the valve.
  3. Look for exhaust deposits in the valve outlet. Remove the deposit build-up with a screwdriver.
  4. Clean the mounting surfaces of the intake manifold and the valve assembly.

Installation Procedure

    Object Number: 312255 Size: SH
  1. Install the new EGR gasket (2).
  2. Install the EGR valve (1) to the manifold.
  3. Install the bolts or the nuts (4).
  4. Connect the vacuum tube to the valve.
  5. Install the air cleaner.