I had my Timing Belt replaced at the dealer and they said it was caused by the tensioner i.e. loose belt. They also replaced the timing cover on my belt to a larger one.
My ride(Cardomain link) :
'95 Contour 16V Zetec DOHC,
Teal , ATX
Born on Sep. 4, 1995
86+ miles
*LEDs mods are on their way!*