Oxygen Sensor

[David Vanden]

Please explain, "You should try cleaning the ISV (use carb cleaner, actuate
it momentarily with a 9v battery each way a few times)."

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.

On Tue, May 26, 2015 at 7:19 PM, Huw Powell <audi at humanspeakers.com> wrote:

> You should try cleaning the ISV (use carb cleaner, actuate it momentarily
> with a 9v battery each way a few times).
>
> At rest it's about 1/3 open, which lets the engine run if it is broken.
>
> The computer runs it whenever the idle switch is closed to let the right
> amount of air around the throttle body.
>
> Test that switch as well, it's the one under the TB, a pair of the pins at
> the connector on top of the TB should read 0 ohms when the throttle is
> closed and open to infinite when it is just barely cracked)
>
> Also, disconnect every electrical connection under the hood one at a time,
> clean, and reconnect using dielectric grease.
>
> I hope this helps.
>
> - Huw
>
> PS, what year and model is it?
>
> On 5/26/2015 4:00 PM, David Vanden wrote:
>
>> I will put in an oxygen sensor.  Thanks for the advice.  On a separate
>> note I just replaced the fuel pump and she is idling too high.  I tried
>> adjusting the mixture but that didn't fix it.  Any ideas?  Decreasing
>> the air on the throttle by setting the screw all the way to the right
>> decreased it but not enough.  Any suggestions?
>>
>> David
>>
>> On Tue, May 26, 2015 at 2:54 PM, Huw Powell <audi at humanspeakers.com
>> <mailto:audi at humanspeakers.com>> wrote:
>>
>>     Short term, for testing or diagnosing, it will run.
>>
>>     Startup will be normal, but when the engine gets to operating
>>     temperature, the computer won't be able to manage the mixture
>> properly.
>>
>>     Run without it for any length of time - like leaving home - can do
>>     very bad things to the catalytic converter.  Fuel economy will also
>>     suffer.
>>
>>     So first test if the OXS is working.  Then if it isn't, replace it.
>>     Yes, I know, if this is a 4kq, it is *very* hard to get to, and it
>>     will be rust-welded in place.
>>
>>     This might help:
>>
>>     http://audi.humanspeakers.com/timing2.htm
>>
>>     - Huw
>>
>>     On 5/26/2015 11:17 AM, dvanden46 at gmail.com
>>     <mailto:dvanden46 at gmail.com> wrote:
>>
>>         Has anyone noticed if it is detrimental to the car or if the car
>>         runs worse with the oxygen sensor disconnected?  This is for the
>>         CIS E system.
>>
>>
>>
>>
>>
>>
>>         Sent from Windows Mail
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