Intake Manifold Runner Control Valve

Diagnose P2004 (Intake Manifold Runner Stuck Open) effectively. Identify causes like failed actuators, vacuum leaks, or binding flaps. Follow a step-by-step guide to inspect linkage and circuits, avoiding unnecessary part replacements.

This comprehensive guide details the diagnostic flags of a failing IMRC system—including check engine lights (often throwing codes like P2004 or P2006), rough idling, diminished fuel economy, and sluggish throttle response.