mustang help needed asap

[1lonlyranger]

i have a 2004 ford mustang. the problem is the harmonic balancer is making noise at idel only. i thought it was the water pump. i replaced that then i took the serp belt off and the noise was still there. i took the harmonic balancer off re greased it and put it back on. there was no squeek for one day but now it has came back. i have been reading online that is coulb be the cam shaft senser sycronizer (bad speller i know). does any one have advise i would greatly apriciate it.



some info on the car 3.9l 70000 miles does have a aftermarket underdrive pulley on it

monday i am going to change the front seal and clean everything fully.

 

[topnotchoffroad]

Did you watch for movement in the balancer? My 97 V6 stang did that and the balancer wad bad.