Oxygen Sensor
David Vanden
dvanden46 at gmail.com
Thu May 28 06:23:51 PDT 2015
How much do you want for the O2 sensors? Are they Bosch? What type of
connections do they have? Mine is three wire with the two connections.
I have it idling down to about 950 rpm's which isn't bad. While the
temperature sensor reads within acceptable limits it seems like the engine
is running a little hot. I did some tests and I think the thermostat is
stuck, so that is the next thing to fix.
I think the idle stabilization valve is working. It is definitely doing
something. When I hook it up and look at it with it getting juice it
buzzes and stays in one position then opens for a second and immediately
closes again. I think it must function differently when hooked up to the
air intake. Does anyone know otherwise?
I have a confession. Part of the reason it has started running a little
differently is because I installed the Bosch Motorsport 044 fuel pump.
However, that is causing other problems to be revealed so perhaps it is
just as well. Once those ideosyncrasies are fixed I hope I can keep
running it on that fuel pump after all the effort I put into installing
it. My God is it noisy though. For about 55 dollars I can try to guiet it
down some by installing Silicone Silencer Cradle Kit for Bosch 044 Racing
Fuel Pump. Has anyone ever tried using one of these? If so, what did you
think?
Thanks for all the help*.*
David
On Thu, May 28, 2015 at 12:22 AM, <dgraber460 at aol.com> wrote:
> I haven't been following every post or detail, to this point, but from the
> scanning I have done, I am flashing back to my days of fighting the
> idiosynkracies of my stock CIS URQ. I was helped incredibly by a few
> experienced listers, who had tread these paths before me. There are too
> many to name them all, but the late Phil Payne, and Huw Powell, talked me
> off many a ledge.
> What I remember quite clearly is Phil's sage advice that when it comes to
> getting a CIS car to a decent base point there are 3 main issues to get
> sorted. They are in order of importance;
> 1. fuel pressure
> 2. fuel pressure
> 3. fuel pressure
> If that isn't sorted, all other specs are chased in vain.
> If you want to swap O2 sensors, I can send you a couple.
>
> Dennis
> Denver
>
>
> -----Original Message-----
> From: David Vanden <dvanden46 at gmail.com>
> To: audi <audi at humanspeakers.com>
> Cc: quattro <quattro at audifans.com>
> Sent: Wed, May 27, 2015 11:07 am
> Subject: Re: Oxygen Sensor
>
> Yes, now I feel stupid I was measuring milliohms and not ohms. When I
> measure
> it in ohms it reads infinity. Another question. How can you tell
> if the Idle
> stabilization valve is working?
>
> On Wed, May 27, 2015 at 11:19 AM, Huw Powell
> <audi at humanspeakers.com> wrote:
>
> > Ah, I see, you have an auto-ranging meter,
> silly me. I still use the
> > Micronta I got in the 80s, which I set to 300 ohms
> when testing continuity,
> > so of course it goes off-range when "open".
> >
> > Yours
> selects an appropriate range. What you are getting is "close enough
> > to
> infinite" I am sure. You're measuring the resistance of the path
> > through any
> dirt, insulation, and the air and nothing else.
> >
> > And good catch, you need
> that idle switch to actuate before
> > troubleshooting the idle! Remember I said
> what a pain it is to install
> > correctly "on the car".
> >
> > You might want to
> read a lot of this site and digest/bookmark whatever
> > seems useful, especially
> the middle drop-down on the left (1980-87 4000,
> > Coupe, UrQ) since there is a
> lot about your car there:
> >
> > http://audi.humanspeakers.com/index.html
> >
> > I
> hope you also have the Bentley repair manual by now.
> >
> > - Huw
> >
> > On 5/26/2015
> 10:33 PM, David Vanden wrote:
> >
> >> Well apparently the button on the bottom
> wasn't getting pressed because
> >> the location of the switch must have slipped,
> so adjusting the location
> >> of the bottom switch tomorrow will be a good place
> to start.
> >>
> >> What was weird was after I pressed the bottom switch manually
> the
> >> readings for both sensors began reading infinity when not pressed.
> Just
> >> before that the top one was reading 20.82 mohms of resistance when
> not
> >> pressed and the bottom one was reading approx. 3.82 mohms when not
> >>
> pressed. I will have to see what they read tomorrow. At least I know
> >> what I
> have to do with the bottom switch. Thanks all. Good Night.
> >>
> >> On Tue, May
> 26, 2015 at 9:39 PM, Huw Powell <audi at humanspeakers.com
> >>
> <mailto:audi at humanspeakers.com <audi at humanspeakers.com?>>> wrote:
> >>
> >> What DO they read?
> >>
> >>
> Please give us numbers when you take measurements...
> >>
> >> You don't have to
> buy a smoke machine! EVERY repair shop worth its
> >> salt will have one, and
> they are simple to set up.
> >>
> >> All they do is take very low air pressure
> from a compressor line and
> >> heat up some special oil to make the smoke,
> IIRC. Pull a vacuum line
> >> and pump the smoke into it.
> >>
> >> On
> 5/26/2015 9:11 PM, David Vanden wrote:
> >>
> >> Well I am pretty sure I got
> them wired correctly. The only
> >> problem, as
> >> I mentioned is
> that they are not reading infinite when open.
> >>
> >> There has got to
> be a way to locate vacume leaks that does
> >> not require
> >>
> buying a smoke machine. However, if I did is there a model that
> >> you
> >>
> recommend. They come in all shapes and sizes and prices on EBAY.
> >>
> Anyway, I will debate it more in the morning.
> >>
> >> David
> >>
> >>
> On Tue, May 26, 2015 at 8:17 PM, Huw Powell
> >> <audi at humanspeakers.com
> <mailto:audi at humanspeakers.com <audi at humanspeakers.com?>>
> >> <mailto:audi at humanspeakers.com <audi at humanspeakers.com?>
> <mailto:audi at humanspeakers.com <audi at humanspeakers.com?>
> >>>
> >>
> >> wrote:
> >>
> >> Well,
> they are just switches.
> >>
> >> When closed they should read zero or
> as close as possible
> >> (definitely less than one ohm). When open
> your meter
> >> should just
> >> read off scale/infinite.
> >>
> >>
> They won't "vary" anything, the idle switch tells the ECU
> >> to use
> the
> >> ISV to maintain about 800 rpm (and kills fuel if it is
> >>
> above ~1400
> >> rpm). The WOT switch tells the ECU to go into open
> loop with
> >> a
> >> richer mixture for enhanced acceleration.
> >>
> >>
> - Huw
> >>
> >> I hope you got them wired correctly.
> >>
> >>
> >>
> I soldered a set of the throttle body switches I got.
> >>
> Unfortuneately,
> >> they read they had some resistance as
> opposed to being
> >> infinite
> >> when the
> >>
> switches were not activated. I don't know what
> >> happened to them
> >>
> in the
> >> process of pairing and soldering them. However,
> they
> >> were both at a
> >> perfect 0 when activated so I
> used them. I don't think
> >> they would
> >> increase the
> idle?
> >>
> >> This is a 1987 Audi 4000
> Quattro.
> >>
> >>
> >>
> >>
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