[DERBS]

Could MVIM (variable induction system) cause a knock/loud tic come from the motor? My 2004 gts 5 speed is ticking loudly about 5 min after start up and quiets down or goes away completely around 2500 rpm I did full synthetic 7000 mile oil change and motor treatment still does it. I thought it was lifters.

 

[Murkrow]

There's several things that can cause loud ticking. Sounds like you need an actual diagnosis from a reputable shop rather than just guess.

 

[Rodger3G]

That sounds alarming. Definitely have it checked by an experienced mechanic.