I've got a 2.8 V6 with 105K miles. I've owned since new and always changed the oil every 3 to 4k. Never any problems with it until last year when I had a cam exhaust lobe go and changed the cam and lifters, timing chain and gear while I was in there. Everythings been great for the next 7k miles. Now I've developed a knock. Only at idle and only once the oil is up to temp. I rev it to 1500 and the knock goes away. It's definitely not a valve train knock, I'm certain it's in the bottom end. I pulled the serpentine belt off to eliminate all the accesories, checked out the rockers, pushrods, ect. The stethoscope seems to lead me to the block, not the heads. Car runs great, makes no noise going down the road or anytime when it is cold. Oil looked great as did the filter when I cut it open. Oil pressure is low when warm at idle in gear, about 15psi at 900-1000 rpm. The knock isn't constant it comes and goes radomly when idling. I'm hoping the bearing clearnaces haven't opened up enough to be causing this, I would hope with only 105K and frequent oil changes over the last 13 years this wouldn't be the case already. My plan is to put a direct gage in place of the sending unit to verify the factory gage and sending unit are fairly close to correct, then pull the pan and replace the pump and pickup and check the bearings. It's a pretty easy job to do, just want to make sure no one else has had any experience with this before I go ahead with it. Can anyone think of anything I might be overlooking?