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YOUR RESEARCHEngine knocking on WA/CA premium fuel
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Any of you 996s especially in WA and CA experiencing engine knocking? It's a light click noise when going back on throttle in 2nd, but sometimes happens in first.
How bad is this for the car? Should those of us experiencing this knocking noise be concerned about longevity?
As someone stated in another thread, you should confirm if this "knocking" is actually detonation or some other noise. Run high octane (100 or so) and see if the knocking goes away. If it does go away with higher octane then you most likely are dealing with detonation and it is quite bad for the health of your engine.
I have no idea how you can call a 'light click" a knock. Low octane knock does not, in anyway, ressemble a click and would only get worse as load increases in all gears.
What do you guys think it is? The guys who drove with me (Porsche techs) told me it sounds like pre-detonation.
I'm likely getting the terminology wrong. Apologies. Don't mean to test anyone's patience.
Does your tech have access to a PST2 or PiWiS? Different versions of Motronic will allow you to check for knock sensor activity in different ways, either directly or by showing the (per cylinder) ignition timing retard as a result of knock or by some other actual value menu item.
If your timing is not being pulled, either you do not have knock or your knock sensors are not working. Any scanner that displays individual sesnor readings will show you if timing is being pulled.
It wouldn't showup as a fault code, you need to go into the "Actual Value" menu item.
You need to find a shop with a Porsche System Tester 2 (PST2) or PiWiS ($$$). Watching knock sensor activity is not part of the OBD2 standard so the generic scanners that most independent Porsche shops have will not work for this.
Running lean? Your other post on 6 speed state you have a GIAC.
Do it the old fashion way. Take out your spark plugs and 'read' them, that will tell you how the car is running.
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