[s-cars] Knock Sensors?

[Michael Wakefield]

According to Audi training manuals, the forward knock sensor I (G61)  
monitors cylinders 1, 2, and 3. The aft knock sensor II (G66)  
monitors cylinders 4 and 5. The engine timing of an individual  
cylinder can be retarded if knock is detected. If knock continues, a  
richer fuel mixture will be used and the charge pressure is reduced.  
For the S4 and S6, knock control will adapt to fuel quality and  
driving conditions. If a fault (no signal) develops with either of  
the two knock sensors, the ignition timing will be retarded by 11  
degrees and the fuel mixture will be enriched.
Mike Wakefield
93S4
97Cabriolet

On May 25, 2005, at 9:47 PM, Sean Douglas wrote:

> Adam:
>
> Here is a jpg from a screen shot of Bentley, Knock Sensor #1 is  
> item 24
> and KS #2 is item 11. They are hard to see, but KS#1 is just  
> rearward of
> where the thermostat sits, I couldn't actually see KS#2, but it  
> about 12
> inches away towards the back of the engine.
>
> I believe KS #1 monitors cylinder #2 and KS #2 monitors cylinder #4.
>
> Sean
>
> Sean Douglas
> 1997 Audi S6//RS2-spec
> 1990 Audi 90 quattro 20v
>
>
>
>> -----Original Message-----
>> From: s-car-list-bounces at audifans.com
>> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Adam Cramer
>> Sent: Wednesday, May 25, 2005 1:11 PM
>> To: s-car-list at audifans.com
>> Subject: Re: [s-cars] Knock Sensors?
>>
>>
>> Can someone describe where the knock sensor are located?  A
>> pic would be great.
>>
>> I checked SJM but I didn't see anything.
>>
>> Thanks in advance.
>>
>> Adam
>> 95 S6 Avant
>>
>> On 5/25/05, D Cosby <dccosby at hotmail.com> wrote:
>>
>>> Bill,
>>>
>>> Once you try a higher octane fuel (or a bunch of octane booster /
>>> toluene) to eliminate that avenue, check the torque on the knock
>>> sensors. Apparently they can loosen and become overly sensitive.
>>>
>>> Was talking to a mechanic friend a few years ago about a similar
>>> problem... He was telling me about a really tricky customer
>>>
>> car (think
>>
>>> it was an Audi
>>> 90) with a similar problem. After eliminating the obvious,
>>>
>> it turned out
>>
>>> that at a certain RPM there was a loose exhaust shield (or
>>>
>> bracket?) that
>>
>>> would rattle and be picked up by the knock sensor. Long
>>>
>> shot but worth a
>>
>>> look after all else fails.
>>>
>>> Good luck.
>>> Dwayne
>>>
>>>
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>>>
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>
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