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How to Replace a GMC EGR Valve

The EGR, or exhaust gas recirculation, valve is a small metal disc bolted to the intake manifold near the carburetor on GMC trucks and vans. The EGR valve draws exhaust gases from the exhaust system and reintroduces them into the intake manifold. Introducing exhaust gases into the combustion chamber helps lower the combustion temperature of the engine, which in turn helps reduce the amount of harmful oxides of nitrogen (NOx) produced by the engine.

Instructions

Removing a GMC EGR Valve

1

Remove the air cleaner housing by unscrewing the wing nut on top of the air cleaner lid and lifting the air cleaner housing straight up until you clear the threaded rod.

2

Locate the EGR valve. It will be bolted to the intake manifold close to the carburetor.

3

Label and disconnect the vacuum line attached to the top of the EGR valve by pulling it off.

4

Remove the bolts that secure the EGR valve to the intake manifold.

5

Lift the EGR valve straight up to remove it from the intake manifold.

6

Use a flat razor blade to clean any gasket material of the EGR valve mounting surface.

7

Inspect the passages below the EGR valve, and use a flat blade screwdriver to clear away any carbon deposits.

8

Vacuum the area around the EGR valve mounting surface. Make sure none of the carbon deposits or loose gasket material is left behind. You dont want it to get sucked into the engine.

Installing an EGR Valve on a GMC

9

Place a new gasket on the EGR valve mounting surface.

10

Lower the new EGR valve into position on the intake manifold.

11

Reinstall the bolts that connect the EGR valve to the intake manifold.

12

Reconnect the vacuum line that attaches to the top of the EGR valve.

13

Reinstall the air cleaner housing by lowering it over the threaded rod above the carburetor and reinstalling the wing nut that secures it.