Sir;
You asked a question, and I provided you an informed, professional opinion. I am an ASE certified master technician, with 26 years of experience in engine repair and related diagnostics.
It is indeed VERY common for these noises to be present in Ford 8 cylinder engines at this mileage. If you take the vehicle in to your local Fords dealer for noise diagnosis, I am sure you will learn this to be correct.
I have provided you as accurate an answer as possible, based on the information you have provided, without being able to inspect the vehicle in person. Providing you the answers to your questions involves an investment of time and effort on our part to do the research required to provide you the best answer possible; and the payment you offered when you posted your question is how we get paid for our investment of time, cost of purchasing the repair data we consult to answer your question, and our knowledge gained from years of hands on experience and classroom training.
My answer is based on my experience and training, as well as searches of professional repair databases for related information. It is the best i can do for you. It is not intended as entertainment; this is how we earn our living. If you are searching for a free entertainment site, there are many of them out there on the web. If you are looking for an informed, professional opinion then this is the site for you.
RE: your engine noise:
My original answer is correct, you should check for the common causes of this noise in your engine (wrist pin clearance & piston slap). There is also a Ford TSB out on this model year for cold knock caused by excessive engine main bearing clearances (the cure is to replace the main bearings on the crankshaft if this is the source of the noise as determined by the listening procedure I recommended originally). I suspect this may not be the cause of the noise you are experiencing, because in my experience the main bearing clearance issues in these engines were present from the factory and usually if this is the source they knocked on startup since they were new,. You seem to have a new, recently occurring knocking noise you find unusual. there is a TSB (#92-18-6) detailing a knocking noise due to incorrect torque converter clearance with the AOD transmission causing premature thrust bearing wear on this engine. Usually though, this is described more as a metallic scraping sound with an intermittent knock, often warm.
A search of a database where professional technicians share repair information and diagnostic information turns up several mentions of the main bearing wear issue, as well as mentions of wrist pin and piston noise.
I hope this is helpful to you, and helps you understand that we DO provide a very inexpensive, professional service here; it is not a game site or for entertainment purposes.
If you choose to have the problem professionally diagnosed, and you find that my answer is correct, the honorable thing to do would be to pay the amount you offered for an answer to your question.
Thanks and good luck...
