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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