[hardk0re]

ANY exhaust leak BEFORE your first O2 sensor can have catastrophic effects on your air fuel readings and set you up for some lean conditions causing detonation or (knock). Get your exhaust fixed up ASAP, check the PCV valves, clean the maf with some maf cleaner, and check the plugs to make sure they are not fouled up. Make sure you've got the right plugs, motorcraft platinums. If its any other plug throw it away and pickup some motorcraft ones. also check the wires going into the coil pack, as those fail often causing lost of spark in some occasions.


That said knock really only occurs under load, so are you WOT when the knock occurs or just cruising? Does it sound just like a knock or bang, or is it like marbles in a tin can?