have a toyota corolla 1994 ,water pump is leaking so ive been keeping an eye on it til i could book it in for repair but somethings occured,it wont start only with a bump and sounds rough altho it runs ok, gets hot very quickly but the fan and thermostat are keeping the temp normal. any tests i could do that would tell me if head gasket has gone, some water from the tailpipe but no white smoke.guy i know says there is water in the valves thats why it wont start of the key, but i cant get my head round that one, im not very good with cars i should add
