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Date:         Thu, 13 Jan 2005 20:46:33 -0500
Reply-To:     Matt Sutton <msutts@EARTHLINK.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Matt Sutton <msutts@EARTHLINK.NET>
Subject:      Re: O2 Sensor Wire
Content-type: text/plain; charset="US-ASCII"

Hey Chuck, I have a 88GL with a Digifant, but I have a feeling we may have the same trouble. I was crippled by it once before- no power, running rich, bucking etc., and replaced way too many parts before finding out it was a short in that green wire. Got nailed again over the holidays in VT in the rain, and finally replaced that wire with a guitar/instrument cable. It's been fine ever since. Basically the same kind of wire- current on the inside, shield on the out, but much more robustly built. I ran it from the ECU connector along the outside of the loom to the engine bay.

Regardless of all my D.I.Y. nonsense, and looking at page 24.20 in the Bentley (for Digijet now): Check the ECU connector at pins 5 and 7(5 is the current and 7 is the ground it seems). If there is ANY continuity between the two, even with the O2 sensor disconnected at the tailpipe, the ECU will freak out, and make the van run bad-to-worse. Why the ECU should care when the sensor is disconnected, I have no idea. But as soon as I cut that wire right at the base of the ECU connector, the van ran fine, albeit in Open Loop mode. I put in the new cable when I got home.

Good luck.

-Matt Sutton 88GL

From: "Chuck Mathis" <cmathis@HOUSTON.RR.COM> To: <vanagon@GERRY.VANAGON.COM> Sent: Thursday, January 13, 2005 9:16 AM Subject: [VANAGON] O2 Sensor Wire

> Anybody got the VW part number for the shielded green wire for a 1.9L Digijet O2 sensor? > > Lately I've been getting some really funky readings on my Digitool with both a Bosch OEM sensor and a generic Bosch cut-and-splice 1-wire. The readings have been generally high (I think due to other issues) and the engine bogs terribly on acceleration while the readings suddenly go negative!?! Pushing the pedal down far enough to activate the full throttle TPS gets it rolling okay and the readings (while still a bit high) go back to bouncing around in the positive range. I'm not an electronics whiz but I suspect the only way this could happen is a short between the wire and the shielding. > > Chuck > '85 Wolfsburg Westy - 'Roland the Road Buffalo' >


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