Date: Sun, 7 Mar 2004 16:14:42 -0500
Reply-To: Jonathan Farrugia <jfarrugi@UMICH.EDU>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Jonathan Farrugia <jfarrugi@UMICH.EDU>
Subject: Re: Billy won't run
In-Reply-To: <af1c6eaef9cc.aef9ccaf1c6e@ou.edu>
Content-Type: TEXT/PLAIN; charset=US-ASCII
Warren
its time for my second chime in. this is the deal with the oxygen sensor.
the senor you have is three wire heated sensor. the two white wires are
the heating element connections and the black wire is the signal output to
the ecu. the order of hook-up on the white wires doesn't matter as long
as they are both hooked up, because it is simply a resistive heating
element. oxygen sensors work like this when they get heated to the proper
temperature by the exhaust gas the produce a voltage, the voltage is sent
to the ecu. the ecu uses this voltage to determine how to adjust the fuel
mixture.
you can measure whether the oxygen sensor is working very easily with a
multimeter. when it is working properly and you have it hooked up to a
meter on the DC volts scale, the meter should swing back and forth between
0 volts and .45 volts. you measure this by "back probing" the connector.
that means that you leave the oxygen sensor connected and stick one of the
probes to the signal output connection and the other to ground. if you
were to measure the oxygen sensor and get a steady .45 volts your oxygen
sensor is not working properly as steady .45 volts is the default "limp"
mode for the digifant system.
in one of the previous posts boston bob mentioned that your oxygen sensor
was probably fouled out at this point by your current running problems. i
would second that notion but you should test it first. he suggested
unplugging it i think, until the system gets running right then plug it
back in. what this does for you assuming that the senor is still
salvageable is to allow the system to run at the default "limp" mode until
you get your other problems worked out. after all is worked out you would
need to drive it at highway speeds a bit to get the sensor heated up and
the soot deposits cleaned off. once that happens you should be able to
plug it back in and it should work properly. alternately you can pull the
sensor out and heat it up with a torch to burn off deposits.
jonathan
On Sun, 7 Mar 2004, Warren.K.Lail-1 wrote:
> Hi Ken,
>
> I'll do the 1.5 volt battery test this morning.
> I bought a Bosch 02 sensor from VolksCafe, but it
> was the one on which I spliced my wiring harness
> ($39 vs. $135). There were three wires. Two were
> white (identical as far as I could tell) and one
> was black. I oriented the new O2 sensor just like
> the old one (both white wires on top) and switched
> them one by one (just in case the white ones were
> somehow different). I crimped the wires, and
> taped them independently with 3M electrical tape.
>
> VolksCafe says that they use this lesser expensive
> one at their shop all the time with no problems.
> Same part, different wiring harness.
>
> Thanks again.
>
> Warren
>
> ----- Original Message -----
> From: Ken Lewis <kdlewis_wasting_time@access4less.net>
> Date: Sunday, March 7, 2004 7:05 am
> Subject: Re: [VANAGON] Billy won't run
>
> > Warren,
> > Obviously running rich. Check my web site for trouble-shooting O2
> > sensorproblems. http://neksiwel.20m.com/
> >
> > Ken Lewis
> > 86 Transporter Crew Cab
> > 60 356 T-5 Porsche
> > http://neksiwel.20m.com/
> > Vanagon tech, pixs, O2 monitor gadget
> > ----- Original Message -----
> > From: "Warren.K.Lail-1" <wlail@OU.EDU>
> > To: <vanagon@GERRY.VANAGON.COM>
> > Sent: Saturday, March 06, 2004 11:30 AM
> > Subject: [VANAGON] Billy won't run
> >
> >
> > > I drove around for about half hour last night and Billy ran
> > worse and
> > worse. By the time I got home it would barely run. This morning
> > when I
> > tried to start it, it starts, revs up, then immediately dies. No
> > way to
> > keep it running. I pulled the plugs and they were wet and black
> > (less than
> > 100 miles on them).
> > >
> > > I switched the idle control valve and idle control stabilization
> > unit(near the taillight) from my perfectly running 87 GL and no
> > change.>
> > > Help.
> > >
> > > Warren Lail
> > > 88 Westy "Billy Bones"
> > > 87 GL
> > >
> >
> >
> >
>
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