Bit of a problem guys, lately ive been hearing a pinging (valves chattering) pinking sound coming from my engine, i havent done anything to it or modified it. It only happens when goin up a hill at a steady low rev! Its not the engine labouring! Im using the same fuel all the time from the same filling station!!
This ever happen any1 before or does anybody have a solution.
Car running on 95 octance all the time..