Hi all, My Corsa B (C14SE engine) is making pinking noises when under load. I've checked the air filter, replaced the spark plugs and leads and put some redex through the tank (the fuel filter is a year old, but it has had regular doses of redex). I have no idea whether the pinking noise is being caused by a too-high or too-low fuel/air ratio, but seem to have run out of options. Could it be the cam timing?