I have been hearing a clicking/ticking noise for the top area of the motor after driving and assumed it was the injectors maybe and never bother to investigate. Well yesterday I was messing around with the timing belt and turned the crank over to align the timing marks and there after I starting hearing the clicking/ticking again but this time really stood out as I have no injectors in the car as my new injectors have not arrived yet. In knowing that it could be in the valve train I watched the timing marks on the cams just to see if something may move but nothing happened. Any ideas what it maybe and suggestions where to look other than the valve train area. If the lifters are bad would they cause this clicking/ticking noise?