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]

Name: Signal Filter for Air Flow Meter [Late Vanagon]
SKU: GVW-025-906-302A
Price: 71.0 USD
Availability: InStock

Signal Filter for Air Flow Meter [Late Vanagon]

Product:	GVW-025-906-302A
Works With:	1986-1991
Manufacturer:	-
Availability:	Only 5 Left in Stock!
Wrench Rating:	Requires some hand & power tools and minimal mechanical knowledge.

$71.00

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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

5 stars: 6 (86%)
4 stars: 1 (14%)
3 stars: 0 (0%)
2 stars: 0 (0%)
1 star: 0 (0%)

another home run thanks gowesty

easy fix

just be sure to follow the cut one at a time advice and you'll be good to go

My van had the dreaded buck

After I installed this it was gone, ya hoo.

Hiccup / Syndrome fixed

I did not have the hiccup issue, but did have the idle fluctuating issue. I changed the plugs, distributer cap / rotor and plug wires. This added "filter" made my idle rock solid.

Straightforward Install

Clear instructions from GW, with the recommended tools the installation was a breeze.

Signal Filter

Quick delivery.
Haven't had a chance to install yet.
GW instructions need to clearly identify that the circuit board is marked "to ECU" & "to AMF" - I missed it at first.
Looks to be another great GW product.

[parts were received in a timely matter and were the correct parts

Have not installed part yet but I'm sure it will be as good as every other purchase I have made thru Go Westy

Signal Filter for Air Flow Meter [Late Vanagon]

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Signal Filter for Air Flow Meter [Late Vanagon]

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