What are 'highway hiccups' and will this Signal Filter actually fix them?

The 'highway hiccups' are a common annoyance in late-model Vanagons where the engine momentarily stutters or loses power while cruising. This Signal Filter is specifically designed to smooth out the electrical signal between your air flow meter and the ECU, replicating a factory VW fix but with an updated circuit design that is more effective and significantly more affordable.

Why does this require splicing instead of just being a plug-and-play cable?

While we know splicing takes a bit more effort, we designed it this way to ensure long-term reliability. After 20+ years, your original electrical plugs are likely corroded. By cutting and splicing the Signal Filter directly into the harness, you are removing those old, high-resistance connections and ensuring the air flow meter signal gets through cleanly without interference.

What tools do I need to install the Signal Filter on my 1986-91 Vanagon?

To complete the installation, you will need a standard wire stripping and crimping tool. We include detailed PDF instructions to guide you through the process of integrating the filter into your existing wiring harness. If you don't already own a crimper, we offer a high-quality, affordable tool on our site to help you get the job done right.

Can I return the Signal Filter if it doesn't solve my engine's running issues?

Because this is a sensitive electronic component, it cannot be returned once it has been installed unless it is found to be defective. We recommend performing proper diagnostics before purchase, as our policy prevents using electronic parts for troubleshooting. However, if you are experiencing the specific 'hiccup' symptoms common to these vans, this enhanced filter is the proven industry-standard solution.

Signal Filter for Air Flow Meter [Late Vanagon]

Thumbnail of Signal Filter for Air Flow Meter [Late Vanagon]

Signal Filter for Air Flow Meter [Late Vanagon]

Product:	GVW-025-906-302A
Works With:	1986-1991
Manufacturer:	-
Restock ETA:
Availability:
Wrench Rating:	Requires some hand & power tools and minimal mechanical knowledge.

Log into your account or update the vehicle in your profile to view compatability.

After logging in or updating your vehicle, return here and refresh compatibility.

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

Self-certified made in USA of U.S. and imported parts

This GoWesty-designed signal filter cable is a cost-effective replacement for the original VW factory part (025-906-302A).

VW originally released the signal filter cable in order to fix the common "highway hiccups" that occur in many Vanagons, essentially "smoothing out" the signal between the air flow meter and the ECU. We had the VW circuit analyzed, and then we designed our own enhanced version, which performs better than the original VW part and at almost 1/4 of the price!

Fits: All 1986-91 Vanagons

Our version requires cutting and splicing into existing wiring harness (instructions are included but a stripping/crimping tool is not*). We designed ours to be a splice-in installation, the goal being to replace the existing electrical plug and contacts that have been exposed to 20+ years! Splicing can be a bit of a pain, but it provides an added layer of long-term reliability that we felt was critical to ensure that the air flow meter signal is getting through properly. Too many times, folks replace electronic components on their vehicles with shiny new ones, yet plug them into a crummy, corroded old electrical plug and end up solving nothing!

*Need a wire stripping and crimping tool? We offer a very affordable, yet high-quality option here.

To download or print these instructions, please click the arrow in the top right hand corner of the viewer below.

Instructions

This is an electronic part per our return policy, it is not acceptable to use electronic parts to troubleshoot your running issue. Once this product is installed, it may not be returned (unless it is deemed defective).

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.