Date: Thu, 28 Jul 2011 21:15:19 -0700
Reply-To: "Bill Gibson (III)" <bill.bgibson@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: "Bill Gibson (III)" <bill.bgibson@GMAIL.COM>
Subject: Re: Oxygen sensor woes
In-Reply-To: <CACt8bZV=vMAoyJpYFG4vpr_aXvu55Qj1DN66O72G4NYMzUr+dA@mail.gmail.com>
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I'm no expert, and that's an understatement. But, I've been told my '84 will
"hunt" for the best idle if the O2 sensor is working, as you note in the
voltage fluctuation, but if not, the system will use a "default" mix that
doesn't change. This is because it is an early version of digitally
controlled fuel injection.
On Thu, Jul 28, 2011 at 7:58 PM, Peter Lapp
<carrothospital@googlemail.com>wrote:
> So, no takers yet? I just bought another brand new oxy sensor, same one,
> and
> tested it. I got the same results. Any ideas on why this is? It still runs
> fine with the sensor unplugged.
>
>
> On Thu, Jul 28, 2011 at 7:27 AM, Peter Lapp
> <carrothospital@googlemail.com>wrote:
>
> > Hey all,
> >
> > I recently purchased and installed the stainless steel exhaust from Rocky
> > Mountain Westy. I also got a brand new 3-wire oxy sensor to go with it.
> > Well, I brought it out for it's first test ride afterwards and there was
> > some weird hesitation and roaming idle. I took it home and thought that
> > maybe I was an idiot and forgot to remove the plastic protective cap from
> > the sensor before installing it. That doesn't seem to be the case now,
> > because the cap covers the threads of the sensor too, and I know those
> > weren't covered when I installed.
> >
> > If I unplug the sensor, it works great. If I plug it in, the hesitation
> is
> > gone now, but the idle is not completely stable. It's not all over the
> > place, but if you watch the needle, you can see it jump up and down just
> a
> > hair. I hooked up a voltmeter to the signal wire with the heater wires
> > connected. With the signal wire connected and the voltmeter on it, it
> will
> > be at .45v, then if I give it gas, it will steadly climb. After I removed
> > the gas and let it sit for a little idling, it started jumping between .1
> > and .7v, which I think it what it's supposed to do.
> > With the wire disconnected and a voltmeter on it, it would start at 0
> volts
> > and would climb indefinitely when I gave it gas. I'd have to try it again
> > and check the numbers.
> >
> > Does anyone know how to correctly test the sensor? I figured maybe it
> could
> > be defective. It's part #13957. If someone could help me get this figured
> > out, it would be much appreciated. Maybe I had this issue all along, but
> my
> > leaky exhaust hid it. Maybe now with a fully working exhaust it's just
> > rearing it's head.
> > Thanks a lot!
> >
> > -p
> >
>
--
Bill Gibson
Tempe, Arizona, USA
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