[s-cars] Knock Sensors?

Bill Clancy clancybill at yahoo.com
Tue May 24 19:59:39 EDT 2005

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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