My c20xe engine is pinking only when is hot and only from 1.500 rpm up to 3.0000 rpm. And it hasn't to be in load to pinking. It's is very noticeable from 1.500-2.000 rpm with second gear in acclivity withe a very little touch on the accelarator foot. If I put the accelarator down, it will pinking again but for very little time because the revs will be increasing faster.
I tried and super unleaded, it's happen the same but with less pinking.
The engine is from the newer with the dizzyless setup.
I am thinking to chnche the plug leads (very expensive ) and the temp coolant sensor.
Is it possible to have problem the knock sensor? I don't have faults.
When the engine is cold, all works ok.