My van's idle is rough. Is this Idle Air Control Valve definitely the problem, and will buying yours fix it?

It's tough to say for sure if this Idle Air Control Valve is the *only* issue without diagnosing your specific Vanagon's running problem. These vans don't have advanced onboard diagnostics, so figuring out what's wrong can be tricky. While replacing this part is often a good step for idle issues, sometimes other engine settings have adjusted to compensate for a failing part. After installing a new IAC valve, you'll likely need to follow the baseline settings procedure in the Bentley manual. If it doesn't solve the idle issue, remember that our IAC valves are tested before shipping, and we offer returns on electronic parts as per our policy.

I see cheaper IAC valves online. Why should I spend more on the GoWesty version, especially with the DuroGreen mount?

That's a great question! The key difference is quality and reliability. While cheaper IAC valves might look the same, they're often made with lower-quality components that don't function correctly, leading to more frustration. Our IAC valves are manufactured in Europe to our specs and guaranteed to work exactly like the original VW/VDO valve for Digifant systems. Plus, they meet our GoWesty Fuel Injection System requirements. The included DuroGreen Viton rubber mount is a significant upgrade from standard rubber; it's designed to withstand extreme temperatures and resist fuel, oil, and other chemicals, meaning it will last much longer in the demanding environment of your Vanagon. We even test every single valve to ensure it works perfectly.

What exactly is this DuroGreen rubber mount, and why is it better for my Vanagon?

The DuroGreen mount is made from Viton (also known as FKM), which is a high-performance fluoroelastomer. Think of it as super-tough, specialized rubber. Viton is known for its incredible resistance to extreme heat, fuel, oil, and other harsh chemicals commonly found in your engine bay. Unlike regular rubber that can break down quickly, Viton is built to last, offering excellent resistance to UV, ozone, and weathering too. We use this material for our DuroGreen parts because we want them to last as long as possible – much longer than typical aftermarket replacements. The green color signifies it's a genuine GoWesty, high-durability part.

Will this Idle Air Control Valve fit my specific Vanagon year and model?

Yes, this Idle Air Control Valve is designed to fit 1986-91 Vanagon models with the 2100cc Waterboxer engine. It also works with all GoWesty 2.2, 2.3, and 2.45, and 2.7 Waterboxer conversions. This includes both 2WD and 4WD models, and works with both automatic and manual transmissions, regardless of the body style (like Westfalia Campers, Multivans, etc.).

Idle Air Control Valve and Rubber Mount (DuroGreen) [Vanagon]

Thumbnail of Idle Air Control Valve and Rubber Mount (DuroGreen) [Vanagon]

Idle Air Control Valve and Rubber Mount (DuroGreen) [Vanagon]

Product:	025-906-457A
Works With:	1986-1991
Manufacturer:	GoWesty/Quality Aftermarket
Restock ETA:
Expected to ship:
Availability:
Wrench Rating:	Requires no or basic hand tools and no mechanical knowledge.

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Proposition 65: This product may contain chemicals known to the state of California to cause cancer, birth defects, or other reproductive harm.

Reliable Idle Air Control Valves are getting hard to find. We are currently developing and sourcing a replacement that performs just as well—if not better—than the original. Apologies for the inconvenience! Sign up above to be notified when they're back in stock.

Now includes our DuroGreen Viton rubber mounting grommet at no extra charge!

This Idle Air Control Valve (IAC) is the real deal. Unlike the cheap (and improperly functioning) Asian reproductions found on Amazon, eBay, and your local auto parts stores, our IAC valves are manufactured in Europe to our specifications. They are guaranteed to function identically to the original VW/VDO valve for Digifant, and meet the strict requirements of our GoWesty Fuel Injection System. On top of that, we test every single IAC valve on the same engine to make sure they work as they should. Simply put: you will find lookalikes elsewhere, but an IAC that is guaranteed to work and includes a GoWesty upgraded design DuroGreen mount can only be found at GoWesty.

Fits: 1986-91 Vanagon 2100cc Waterboxer & All GoWesty 2.2, 2.3, 2.45 & 2.7 Waterboxer

Before you buy: If you are unsure how to test your existing part to see if it's bad, read the following article: Idle Control System: 1986-91 Vanagon

Installer beware: Changing out any one part of your EFI system that is faulty with a new or rebuilt part may cause worse running because other settings may have changed over time to compensate for the faulty part you are replacing. Following the baseline settings procedure in the Bentley manual is required after installation. Also please read our return policy related to electric and electronic items.

Installation note: Please keep in mind that this part may not solve your idle issue, but it certainly doesn't hurt to replace it. It is often challenging to diagnose a Vanagon running issue, because these vehicles don't have modern on-board diagnostics. If you plug in this part and it does not fix your issue, you still own the part. Click here for more information about returning electronic parts.

What is Viton you ask?

Well, Viton is a fluorocarbon-based fluoroelastomer. Cool! It is considered one of the best synthetic rubber materials available. It is known for its ability to withstand extreme temperatures and fluid resistance, making it the ideal material for harsh environments. It is often used in the aerospace and automotive industries where exposure to high temperatures, fuel, oil, and other chemicals is common. It is tough and durable, with great abrasion and tear resistance. It is famous for its fluid resistance and ability to withstand exposure to aggressive fuels, oils, acids, gases, hydrocarbons, and other chemicals. Viton also has a strong resistance to UV exposure, oxidation, ozone, weathering, and molds. So yeah, it is really good stuff!

The material used to make this Viton (FKM) product conforms to the following testing standards: ASTM D-2240, D-412, D-792, D-573, and D-471

At GoWesty, we know materials matter—especially when it comes to elastic polymer (“rubber”) parts. Do you ever wonder why OEM parts seem to last many years, but often the replacement parts break down in a matter of months? It’s because manufacturers had to support every part of their vehicles for at least ten years or suffer the consequences of customer dissatisfaction and ultimately loss of sales. The devil is in the details when it comes to the stuff of which parts are made. Just because it looks the same doesn’t mean it is the same! You can have two identical-looking parts in your hand and one of them might be complete junk. If you have a DuroGreen GoWesty part in your hand, you can rest assured it is made of the very best, high-quality material for the application.

We make our proprietary polymer parts green so you can tell it is a genuine, properly engineered, maximum-durability part available only from GoWesty!

Every DuroGreen product comes with a 10-year, no-hassle, 100% satisfaction guarantee.

No-questions-asked refunds are available within the first six months. If you don’t like it, return it for a full refund.

10-year replacement warranty coverage applies to the original owner for any DuroGreen item that is used for the intended application.

Coverage applies to material defects only. If a product fails within the coverage period, we’ll replace it.

Labor and shipping fees are excluded.

Reference numbers can be OE part numbers, superseded part numbers, and compatible part numbers. We provide this information to help ensure you're getting the right part for your needs.