Ok, 94 GP SE with 155k mi has been knocking.
When inside the vehicle after a cold start, the knocking is a muffled tap tap sound, and a slight vibration can be felt in the floor. However, when the hood is up and I'm standing in front of the car the knock sounds like something is whacking the engine with a hammer from the inside.
I only notice this while idling in the morning or when first started. The engine sounds rough in general and eats about a quart of oil a month.
I bough a new EGR valve last week and put it in because I had a CEL that read out EGR solenoid. Does this have anything to do with the knocking and rouch running?