The Nissan Laurel C33 Air Regulator Valve Hose off the intake manifold is an essential OEM component for maintaining correct idle control and smooth drivability in RB20-powered Laurel models. Terra Firma Automotive offers this genuine Nissan hose for owners and restorers who want factory-correct performance from their classic C33 platform. Designed specifically for the RB20DE and RB20DET engines, this hose provides an exact, vacuum-tight connection between the intake manifold plenum and the air regulator valve mounted off the manifold.
During engine operation, this hose routes controlled bypass air downstream of the throttle body to the air regulator, allowing the engine management system to stabilize idle speed during cold starts and compensate for additional loads such as electrical demand or power steering input. Because the RB20 idle control system is highly sensitive to airflow accuracy, any degradation in this hose can introduce vacuum leaks that result in rough idle, fluctuating RPM, hesitation, or improper air-fuel ratios. Using the correct OEM-spec hose ensures the ECCS system can maintain precise idle control as originally engineered by Nissan.
Constructed from reinforced, heat-resistant rubber with molded bends, the Laurel C33 air regulator hose is built to endure high under-hood temperatures, oil vapor exposure, and constant vibration from the inline-six RB20 engine. Aging or hardened hoses are a common failure point on older vehicles and are often overlooked during troubleshooting. Replacing this component with a genuine Nissan part restores stable idle behavior and predictable throttle response.
Terra Firma Automotive specializes in authentic Nissan RB-series components, making this air regulator valve hose the correct choice for preserving reliability, drivability, and originality in the Nissan Laurel C33.
- Not For RB20E Single Cam Motor
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