Where is the ERG valve on a 4.3 Chevy Blazer?

The ERG (Exhaust Gas Recirculation) valve on a 4.3L Chevy Blazer is located on the passenger side of the engine, near the intake manifold. It's usually fairly close to the distributor (if it has one), but the exact location might vary slightly depending on the year and specific engine configuration. You'll likely need to look closely at the intake manifold and surrounding components to locate it. It's usually a small, cylindrical valve with vacuum lines connected.