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Porsche > 911 & 912 (1965-1989) > 911 1987-1989 3.2L G50 > Engine Electrical >

Idle Control Valve

Idle Control Valve

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DISPLAYING 1 to 5 (of 5 products)
Idle control valve hose. Porsche 911 84-89 - 93011058902/8, 93011058902
2
Idle control valve hose. Porsche 911 84-89
Special Order item
93011058902
Product Information
Product Information
Idle control valve hose.

porsche

Fits:
Porsche 911 Carrera 3.2L 1984-89

Click 'Zoom in' for large parts diagram.
Diagram ref no 38

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93011058902
93011058902
93011058902

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Idle control valve hose. Porsche 911 84-89 - 93011058902/8, 93011058902
3
Idle control valve hose. Porsche 911 84-89
93011058902/8
Product Information
Product Information

Idle Control Valve Hose 

Maintain smooth engine performance and stable idle speed 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:

  • Porsche 911 1984-1986 3.2L
  • Porsche 911 1987-1989 3.2L G50  

Diagram ref no 38

The idle control valve hose is a vital component of the engine's intake system, providing a sealed air passage between the idle control valve and the intake system. A damaged or leaking hose can introduce unmetered air, leading to poor idle quality, reduced drivability and engine management issues.

Ideal for routine maintenance, engine restoration or resolving vacuum leaks, this OE Match hose restores factory-style performance and reliability.

What Does the Idle Control Valve Hose Do?

The idle control valve hose forms part of the engine's idle air circuit.

Its primary functions include:

Carrying metered intake air to and from the idle control valve. Allowing the engine management system to regulate idle speed accurately. Maintaining a sealed intake system to prevent vacuum leaks. Supporting smooth cold starts and stable idle operation. Helping optimise fuel mixture and engine efficiency.

A correctly sealed idle control valve hose is essential for consistent idle performance and proper operation of the Bosch Motronic fuel injection system.

Why Does the Idle Control Valve Hose Fail?

Located within the engine compartment, the hose is continuously exposed to heat, oil vapour and engine vibration.

Common causes of deterioration include:

Rubber hardening through repeated heat cycles. Cracks developing with age. Splits caused by engine movement and vibration. Oil contamination softening or degrading the rubber. Loss of flexibility leading to poor sealing. Perishing after decades of service.

Even small cracks can create vacuum leaks that affect engine performance and idle quality.

When Should It Be Replaced?

Replacement is recommended when:

The engine idles unevenly or stalls. Idle speed fluctuates or hunts. Vacuum leaks are detected. The hose shows signs of cracking, splitting or hardening. Carrying out an intake system overhaul. Replacing the idle control valve or other intake hoses. Performing preventative maintenance on higher-mileage vehicles.

Replacing ageing intake hoses is an effective way to restore smooth idle performance and eliminate hard-to-diagnose vacuum leaks



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

93011058902
93011058902
93011058902

The product you are viewing cross references to these numbers
Idle control valve hose. Porsche 911 84-89 - 93011066500/8, 93011066500
2
Idle control valve hose. Porsche 911 84-89
Special Order item
93011066500
Product Information
Product Information
Idle control valve hose.

porsche

Fits:
Porsche 911 Carrera 3.2L 1984-89

Click 'Zoom in' for large parts diagram.
Diagram ref no 34

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

93011066500
93011066500
93011066500

The product you are viewing cross references to these numbers
Idle control valve hose. Porsche 911 84-89 - 93011066500/8, 93011066500
2
Idle control valve hose. Porsche 911 84-89
93011066500/8
Product Information
Product Information

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:

  • Porsche 911 1984-1986 3.2L
  • Porsche 911 1987-1989 3.2L G50

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
93011066500
93011066500

The product you are viewing cross references to these numbers
Idle speed control valve. Porsche 911 / 944 / 924S - 93060616100, 0280140501
4
Idle speed control valve. Porsche 911 / 944 / 924S
93060616100/1
Product Information
Product Information
Idle speed control valve. 

Fits:
Porsche 911 3.2 Carrera - 1984 to 1989
Porsche 944 2.5ltr - 1982 to 1987
Porsche 944 turbo - 1985 to 1991
Porsche 924S - 1986 to 1988


Diagram ref no 29



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

93060616100
93060616100
0280140501

The product you are viewing cross references to these numbers
DISPLAYING 1 to 5 (of 5 products)
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About Idle Control Valve

Idle Control Valves – Smooth and Stable Idle for Porsche Engines

Idle control valves are critical components in your Porsche’s engine management system, regulating airflow to maintain a steady idle speed under varying conditions. They ensure your engine runs smoothly when idling — compensating for changes in load, temperature, and electrical demand.

At Design911, we supply a full range of genuine and high-quality idle control valves for various Porsche models. Each valve is engineered for precision, reliability, and seamless integration with your vehicle’s ECU, helping maintain consistent performance and drivability.

What Do Idle Control Valves Do?

The idle control valve (ICV) manages the amount of air that bypasses the throttle plate when the engine is idling. Its main functions include:

  • Regulating engine idle speed based on operating conditions.
  • Ensuring stable idle when the air conditioning, lights, or power steering are engaged.
  • Maintaining smooth performance during cold starts and warm-up cycles.
  • Preventing stalling during deceleration or at idle.

A properly functioning idle control valve allows your Porsche to maintain perfect balance between air and fuel flow at idle, ensuring smooth and efficient operation.

Why Do Idle Control Valves Fail?

Idle control valves can wear out or become clogged due to carbon buildup or mechanical wear. Common causes of failure include:

  • Carbon or oil deposits restricting airflow through the valve.
  • Electrical faults in the valve motor or connectors.
  • Air leaks in vacuum lines affecting idle control.
  • Contamination from old or poor-quality fuel and oil vapour.
  • Age-related wear on moving parts causing slow or inconsistent response.

Symptoms of failure include rough idling, engine stalling, fluctuating idle speed, or difficulty starting, especially when cold.

Why Replace a Faulty Idle Control Valve?

A failing idle control valve can cause erratic engine behaviour, increased emissions, and reduced drivability. Replacing it ensures consistent idle performance and protects your engine from stalling or surging.

Benefits of replacement include:

  • Smooth and stable idle under all conditions.
  • Improved fuel economy and lower emissions.
  • Reliable cold start and idle control response.
  • Manufacturer-quality construction for long-term durability.

All idle control valves in our range are built using high-grade materials, precision-engineered actuators, and corrosion-resistant housings, ensuring lasting performance that meets Porsche’s demanding engineering standards.

1. What does an idle control valve do in a Porsche?
The idle control valve regulates airflow when the throttle is closed, maintaining the correct idle speed and preventing stalling. It adjusts airflow automatically to keep the engine running smoothly under all load and temperature conditions.

2. What are the symptoms of a bad idle control valve?
Common symptoms include fluctuating idle speed, rough running at idle, engine stalling, and difficulty starting, especially when cold. You may also notice poor throttle response or higher fuel consumption.

3. How often should a Porsche idle control valve be replaced?
There’s no fixed interval, but inspection is recommended every 60,000–80,000 miles. Replacement is necessary if cleaning doesn’t resolve idle issues or if the valve fails electronically or mechanically.

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