[V8] O2 sensor circuit, rewire from Ecu?

[Ed Kellock]

I have put a 4-wire sensor on two V8's.  I used a bolt on the back of the
driver's side of the engine.  I think it's a mount for the cruise control
diaphram or something.  Both have worked out quite well.

Ed

-----Original Message-----
From: v8-bounces at audifans.com [mailto:v8-bounces at audifans.com] On Behalf Of
7013885254
Sent: Friday, February 05, 2010 10:14 AM
To: ville.hiivola at suomi24.fi; v8 at audifans.com
Subject: Re: [V8] O2 sensor circuit, rewire from Ecu?


For my 4 wire the only diff is an extra wire grounded to the chassis.

---- Original Message ----
From: "ville.hiivola at suomi24.fi" <ville.hiivola at suomi24.fi>
Date: 2/5/10 4:56 am
To: "v8 at audifans.com" <v8 at audifans.com>
Subj: [V8]  O2 sensor circuit, rewire from Ecu?
No, you're not bothering at all. I'm specially interested on this topic 
since i have had so much O2 problems on mine, so keep us posted on how 
it goes! :)

Two wires go to the ECU, pin 10 is the ground for O2 and pin 28 is the 
O2 signal.
One wire to the oxygen sensor heater relay, pin number 8/87 on the 
relay itself.
And i'm assuming one wire is grounded for the heater ground. I'm not 
sure though cause i have 3 wire sensor in mine.

Ville


>----Alkuperäinen viesti----
>Lähettäjä: chance9121 at gmail.com
>Päivämäärä: 04.02.2010 23:57
>Vastaanottaja: "V8List Fans"<v8 at audifans.com>
>Aihe: [V8] O2 sensor circuit, rewire from Ecu?
>
>Ok, ok, ok.  I've so had it with this car's bloody emissions system.
So,
>after running around for 2-3 days, the trip computer is claiming a
dismal
>10.5mpg average, with avg speed in the 40s, mixed highway and in town 
>driving.  It also seems that I'm going through gas pretty quick.  Not
sure
>how accurate the gauge is, but that is pretty bad.
>
>I've tried the O2 sensor 2 times now, and I'm pretty sure the wiring
is just
>not dependable.  The first time I went in there, I found the
connectors had
>been broken off right below the rear of the engine where the air
cleaner an
>IM meet.  So, I had to get creative and redo all that.  I'm not
confident
>its holding up well because of the difficulties with space causing my 
>soldering to be less than optimal.
>
>So, I know I've heard mention of someone testing the circuit at the
ecu
>connection.  And I've found a great place to route my wiring.  The
CAT
>sensor's wiring formally resided on the passenger side footwell,
inboard
>right by the trans tunnel, and just an inch or two inboard of the
thick
>insulation.  I've removed this sensor and spliced the wiring together
to
>fool the sensor, so I have that grommet free to route my wiring
through the
>floor.
>
>So, does anyone know where I need to run my wires?  So far, I think
that I
>would need to run from the O2 fuse in the pass foot well to the O2
heater,
>and then one wire to ground on the chassis (on a 4 wire sensor)  and
then I
>assume two more wires go right to the ECU, is this correct?  Anyone
have the
>pins and maybe color/pictures?
>
>Thanks a Lot.
>Nick.
>
>P.s.  lot of traffic on the list this week, good stuff.  a bit of it
is
>mine, hope I'm not bothering anyone with all the inquriys! 
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>


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