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- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Idle Control Valve Hose
Maintain smooth idle quality and reliable engine performance
with this OE Match Idle Control Valve Hose. Manufactured to the original factory
specification, this provides the correct fit, flexibility and sealing performance required for the
Bosch Motronic engine management system.
Fits:
Diagram ref no 34
This hose connects the idle control valve within the intake system, allowing accurately metered air to bypass the throttle butterfly during idle conditions. A secure, airtight connection is essential for stable engine idle, smooth cold starts and consistent throttle response.
Whether you're replacing ageing rubber hoses during routine servicing or carrying out a complete engine restoration, this OE Match hose helps restore factory performance and reliability.
What Does the Idle Control Valve Hose Do?
The idle control valve hose is a key part of the engine's air intake and idle control system.
Its functions include:
- Carrying metered air between the idle control valve and the intake system.
- Allowing the Bosch Motronic ECU to regulate engine idle speed accurately.
- Maintaining an airtight intake tract to prevent unmetered air entering the engine.
- Supporting smooth cold starting and warm idle operation.
- Helping optimise fuel mixture, emissions and overall drivability.
A properly sealed idle control valve hose is essential for maintaining the precise air-fuel balance required for stable engine operation.
Why Does the Idle Control Valve Hose Fail?
Over time, the hose is exposed to high engine bay temperatures, oil vapours and constant engine movement, causing the rubber to deteriorate.
Common causes of failure include:
- Heat-related hardening and loss of flexibility.
- Cracks and splits caused by age.
- Oil contamination weakening the rubber compound.
- Engine vibration causing fatigue around connection points.
- Perishing after years of service.
- Vacuum leaks developing through small surface cracks.
Even minor air leaks can upset the engine management system, resulting in poor idle quality and reduced performance.
When Should It Be Replaced?
Replacement is recommended when:
- The engine idles roughly or inconsistently.
- Idle speed hunts or fluctuates.
- Vacuum leaks are detected within the intake system.
- The hose becomes cracked, brittle or soft.
- The idle control valve is being replaced.
- Carrying out a full intake or engine overhaul.
- Performing preventative maintenance on older or higher-mileage vehicles.
Replacing ageing idle control hoses helps restore correct idle operation while preventing difficult-to-diagnose vacuum leaks.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93011066500
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