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Toyota 4Runner Intake Plenum Hose Diagram: V6 Engine Vacuum Routing Guide
"The Toyota 4Runner V6 engine—specifically the 3.4L 5VZ-FE and the 4.0L 1GR-FE—relies on a complex network of vacuum hoses connected to the intake plenum to regulate air-fuel ratios, idle control, and emissions. Maintaining this system requires an accurate understanding of hose routing, as displaced or cracked hoses commonly cause vacuum leaks, resulting in rough idling, engine hesitation, and P0171 or P0300 series diagnostic trouble codes. Understanding the Role of the Intake Plenum and Vacuum System The intake plenum acts as the distribution hub for the engine's air intake system. In the 3.4L 5VZ-FE V6, which powered the 4Runner from 1996 to..."
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