Re: Question about setting mixture

["Bill Scarince" <scarince@gte.net>]

Christian,

You said "...putting an ammeter across the terminals....."

If this is really what you meant to say, then that's the problem.  You need
to put your ammeter in series with the circuit.  IOW, imagine that you were
to simply snip one of the wires that goes to the connector.  You would then
put you ammeter in between the two ends.

So in real life, you should unplug the connector, then use a plain piece of
wire to complete the circuit from one side of the plug to the sensor, and
use your ammeter to complete the circuit from the other side of the plug to
the other side of the sensor.  The way to make this easier is to buy another
Bosch female plug.  Remove your sensor plug, and plug this new one in.  Now
you'll have these two wires sticking out.  Attach one of them to one side of
the sensor plug.  Attach the other to one side of your ammeter.  Attach the
other side of your ammeter to the remaining contact in the sensor plug.

No matter what the reading, you know something is wrong w/your setup if the
car dies, because the current should still be passing through your
insturmentation, keeping the control loop intact.

If you look at the picture in the Bentley manual and follow the wires,
you'll see what I mean.

Bill

----- Original Message -----
From: "Christian Els" <tiAn@usiw.net>
To: "Scirocco List" <scirocco-l@scirocco.org>
Sent: Monday, August 21, 2000 2:33 PM
Subject: Question about setting mixture


> After exorcising some fuel injection demons I m attempting to verify/set
the
> mixture.
>
> According to Bentley this involves putting an ammeter across the terminals
> of the Differential Pressure Regulator and measuring the current. It is
> supposed to bounce up and down based on input from the O2 sensor but
average
> 5 mA for a 1.8L 16V.
>
> On my car when I connect the probes to the meter I get a reading of ~18mA
> and then the car dies. Every time.
>
> Did I miss something I was supposed to disconnect/swap/alter first?
>
> The brief reading it does return is indicative of a very lean mix, which
> would correlate with the hard hot-start behavior I am trying to cure, as
> well as it running hot as it does.
>
> Any thoughts on what might cause it to die like this?
>
> TIA
>
> Christian
> 87 16V
>
>
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