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question - has it always been a -9 and you never had a problem, or you just decided to check and it was at -9, or did you get a cel which made you check? or perhaps engine started doing something it hadn't before which made you check?
i ask as my 3.2 with a row flash ran at -6 for years no problem, and only triggered a cel when it hit -9.
that says a few things ...
-9 it the limit for good behaviour set by porsche.
- that the car will run fine at less than -9.
- that the deviation was getting worse.
you see, the deviation is read by a sensor. if improperly set (either from the factory or by a mechanic after the fact) then the sensor can read off of true value. the real info you glean from the deviation sensor is not the absolute value but the change in value and the rate of that change over tiime.
for example, if it starts at -4 and stays there then suspect the sensor.
if it starts and one value and slowly decreases to a higher value (say it goes from -4 to -4.5 to -5 to -5.5, etc.) then suspect you chain pads are wearing and look for little brown plastic bits in your oil filter.
if it starts at one value then aggressively changes to say -16 then suspect your solenoids and look for little green rubber bits in your oil filter.
back to my initial question then - what is your deviation history?
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