So recently done the headgasket on my GT and ever since then there's been a couple of strange things happening; Firstly engine management light comes on after 2300revs, when the head was being removed by me and my friend, he pulled a wire and out came the wire and a sensor of some kind. Would I be right in saying knock sensor? Next there is a distinct 'supercharger' like whistle coming from the cambelt side of the engine. Told it could be the belt being too tight? Finally there is a prominent 'tick' again coming from the cambelt side, can only be heard when I go past about 1/4 throttle and its frequency increases the more I put my foot down, however it does go away eventually. Side note the engine smells very hot. Any ideas? Thanks Sam