UPDATE #2 IN OP - Not ANOTHER Engine Noise Thread Cross posted from the 2nd Gen sub-forum... OK - I have only had my 2005 Expedition a few weeks and after reading on this forum either my Ford has developed sympathetic conditions from all your vehicles, I have lost my mind and imagining things, or my truck is sick... When I got it there was no engine noise. It was louder, of course, than my 4.6 in my Explorer but no knocks, ticks, etc... Now there is a tick and a rough 'jumpy' idle that you can feel in the driver's seat. The tick started a week or so ago... The rough idle started when the temperature dropped below freezing this past week. My idle is between 500 and 600 and there is no discernible change in RPM or engine noise but driver and passenger can feel jumpy idle. I get stutter/hesitation with low acceleration but it goes away if I give it moderate/heavy acceleration. I read through the Rough Idle Thread but when I checked, what I hoped was the right line there was no change in the idle and no vacuum felt. No check engine light or any other indicators showing... And of course here is a vid from the front of the engine, both sides, both wheel wells, and exhaust. I have a OBD scanner coming from Amazon, it should be here next week. What the heck? I can't tell my wife I need to drop $$$ into this thing... 2005 Expedition Engine Noise - YouTube UPDATE Consistent code for misfire on #6 - swapping coils doesn't move the code. Worried about breaking the plug without having the tool. Posted to local forum and guy comes out and confirms #6 misfire and gets the plug pulled. It was a 5/8" champion plug that was extremely loose... Popped new motorcraft plug in and runs great. Now I have to check/change the other 7 Guy listens with stethoscope and says that the passenger timing chain is making the majority of the noise and that cam phasers MAY be part of the issue the timing chains need replacing. $200 for kit and $100 for all the gaskets and $500 for his labor.... Says I can still drive it and just to be aware of any changes in power, oil pressure, etc... that would indicate timing chain jumped teeth... Update #2 Timing chain was replaced as well as all the remaining plugs and all gaskets and seals too... Guy inspected the phasers and said they were fine and did not need to be replaced. The engine is still noisy but nothing like before. He said that it was normal engine noise.