[s-cars] Knock Sensors?

[Sean Douglas]

If you have a bad knock sensor, the VAG-COM should tell you this, I'd
start by checking the fault codes.

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 Bill Clancy
> Sent: Tuesday, May 24, 2005 4:59 PM
> To: s-car-list at audifans.com
> Subject: [s-cars] Knock Sensors?
> 
> 
> 
> Does anyone know if there is a way to check the knock 
> sensors?   Or is there a way to disable them temporarily to 
> see how the engine runs?    
> 
> I continue to get inconsistent performance.   It runs better 
> with all the turbo leaks fixed and with new spark plugs... 
> but I still feel the engine sort of sputter and back off a 
> bit at WOT.    It's been suggested that the ECU senses a 
> knock and backs off the timing.    I did do some road testing 
> with the VAG-COM software on my laptop and I think I can 
> correlate the power loss to the timing -- at WOT at @3500RPM 
> the timing moved up to 12.8 BTDC, then it moved to 9.8 (I 
> think that's the power loss I feel), and then back to 11 or 
> 12.    On a good run the timing seems to stay at 12.8.   On a 
> better run, sometimes I record 13 or higher.    
> 
> I have another fuel/timing chip for 91 octane that Mr. Myers 
> provided, but I am not yet convinced that the problem is 
> knocking 91 octane fuel.    Or maybe it is.   Could it really 
> be that simple?    
> 
>  
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