hello aaloon,
my i know what brand of the timing belt have u been install?
its the same problem occur to me when i install the Power Enterprise timing belt.
the "sound" came from you engine bay... in the pulley area after the long stop/rest.
the mechanic claim that the timing kinda "keras" or old stock... maybe faulty unit.
then the mechanic replace to the OEM Mitsubishi... then its ok...
you may refer to this link regarding the "noise" problem for timing belt.
http://www.zerotohundred.com/newfor...wners-club/303726-wta-evo8-or-evo8-mr-11.html
p/s: the Power Enterprise timing belt paid by the seller. but the OEM by the mechanic.
hope this might help u....