Quote Originally Posted by 99_VX View Post
I do not hear a knock on idle but do from 2.5K to 3.5K rpm or so. I also believe the knock gets louder on load (driving it in 1st gear for example).
Since the knock gets louder "under load" (gas pedal input), then I suspect cheap low octane gasoline causing "detonation" (knocking when applying gas pedal input). Run your VX to near bone empty, and then put in a full tank of high octane "Premium" grade gas from a reputable brand (i.e. Chevron, Shell, 76, BP, Texaco). Never, never, use ARCO (their gasoline totally sucks).