[V8] Code 2341 - disconnected OXS, still rough, plus exhaust hissing

[Karl D. Middlebrooks]

Okie dokie; when I put in a new OXS, I'll use a 4-wire and ground it 
accordingly. Both cats are dead, it sounds like. I got under there this 
morning and whacked both of them with a rubber mallet, and there was 
rattling aplenty. There's also a huge big hole rusted out in the pipe that 
connects from the exhaust manifold to the frontmost cat, and the bolts are 
totally rusted shut, so I'm gonna just send it out to an exhaust shop 
locally and let them deal with it.

Meanwhile, the 93 is back on the road again. I think I may have decided 
against doing the 5 speed conversion, so I may have some parts (tranny, 
pedal cluster, subframe, and driveshaft from a 200) up for sale soon. If 
anyone in the Pacific Northwest wants the stuff and will come pick it up 
locally in Portland in the next week or two, give me a holler.

--------------------------------------------------
From: "Ron Wainwright" <ron_01056 at yahoo.com>
Sent: Wednesday, February 04, 2009 3:55 AM
To: "urq" <urq at pacbell.net>
Cc: <v8 at audifans.com>
Subject: Re: [V8] Code 2341 - disconnected OXS, still rough,plus exhaust 
hissing

> That is absolutley correct on all accounts!!!!
>
> When I put my 4 wire 02 in I got the extra ground on the back of the 
> d-side motor. Rite were the ECU gets it's ground under & to the side of 
> the cruise bracket & coolant cross over pipe.
>
>
> --- On Tue, 2/3/09, urq <urq at pacbell.net> wrote:
>
>> From: urq <urq at pacbell.net>
>> Subject: Re: [V8] Code 2341 - disconnected OXS, still rough, plus exhaust 
>> hissing
>> To: "'Audi V8Q Mailing list'" <v8 at audifans.com>
>> Date: Tuesday, February 3, 2009, 11:27 PM
>> If so, why didn't things pick up when the OXS is
>> disconnected?  The OXS or
>> FPR may indeed be (or have been) bad, but if so, the
>> exhaust hissing
>> indicates that the extra rich exhaust caused damage to the
>> cats.
>>
>> I must say that I don't think it is wise to recommend
>> connecting the ground
>> for the 4-wire OXS to anything other than the engine block.
>>  If things get
>> better at all after grounding to the car body you must have
>> had a really bad
>> OXS.  By connecting the ground of the OXS to the body of
>> the car you are
>> guaranteeing that the ECU will get a signal which is
>> affected by
>> battery/alternator load.  People seem to think that
>> there's such a bad
>> connection between the crossover pipe and the engine block
>> that a good
>> connection to the shiny ground on the body of the car *has*
>> got to be better
>> ... but since the OXS current is very small the resistance
>> is less of an
>> issue.
>>
>> If you look at the wiring diagram for the PT/ABH and focus
>> on how the ground
>> wires are arranged between the ECU and the engine, the
>> grounding was
>> designed specifically to provide a reference for the
>> sending units which is
>> not affected by the current induced voltage changes on the
>> circuits for the
>> output devices (injectors, ignition coils, solenoids).  By
>> connecting the
>> OXS ground as you have the reference for the OXS signal is
>> having to pass
>> through the high current ground braid that goes from the
>> body of the car to
>> the engine block.
>>
>> There are at least two bolts on the back of the engine
>> which were intended
>> for providing a proper reference.  It is perfectly
>> acceptable to recommend
>> someone use a 4-wire OXS, but for anyone who chooses to do
>> so, look for
>> these points on the engine and figure out a way to connect
>> the OXS ground
>> wire to one of these points.
>>
>> Steve B
>> San Jose, CA (USA)
>>
>> -----Original Message-----
>>
>>
>> I'm gonna go with you just got a bad O2 Sensor, and
>> when you replace it
>> You should use a 4wire unit, Run the extra ground that you
>> have on the
>> 4wire one up to the drivers strut tower and ground it with
>> the rad fan.
>>
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>
>
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