Yeah same here.

4.6w, 74500 miles.

 

Were having major roadwork in the are and have those like 6inch temporary replacement curbs and they amplify the noise really bad
I think im gonna go somewhere and see if they can hook up the engine to one of those carbon cleaning machine because I've heard the pinging is usually cause be carbon build up in the EGR ports.

 

The pinging sound I believe could be your timing out of whack. I would advance the timing in my 5.0L Mustang and if I advanced the timing too much it would make a pinging sound when accelerating and if I used 93 octane the pinging would go away. My guess is get your timing checked and advance or retard the timing to factory specs. Let me know if it works.

 

I beleive the timing on our trucks is computer controlled.

 

here is a novice question for you, what is knocking, and whoat does it sound like? what about piston slap?

 

I think I have the same problem which is carbon build up on the pistons which is causing excessive heat (labor knock) The carbon has to be cleaned out and probally the computer being reset. The Ford engines are worse than other engines about building up carbon somewhere around 60-80000 miles. I ran seafoam through mine about a month ago and the pinging stopped with 87 octane, however it has returned a little so I may do it again.

 

I have worked on this problem quite a bit over the last few years. My advise would be to start out by disconnecting the negative battery terminal and turning on your headlights for about 10 minutes to drain the juice and reset the computer. (This along with other things will reset your timing.) While the battery is disconnected, check your air filter, and clean your MAF sensor (both will take you less then 10 minutes.) Then reconnect the battery terminal, start the truck back up, and let it idle for 5 to 10 minutes for the computer to 'relearn' it's idle properties. Over the first couple hundred miles the computer will be relearning your driving habits, so you might try driving a little more aggresively over this period, especially at the points in your RPM range where you have expierenced pinging the most. If your problem persists at that point, it's time to go a step farther and clean out the throttle body and EGR system, replace your fuel filter, and then check the gap on your spark plugs, aswell as your DPFE sensor and IAC valve. At that point I would replace your oxygen sensors before having a customer chip burned to overcome the problem. If you will look in the passenger side door seal, you will see a white sticker with your computer 'program' on it it. If you have the FOU1 (like me) you will notice the problem the most as it is a common problem with the FOU1 program, and will most likely have to have a custom chip burned to overcome the problem completely. Generally speaking, the dealership is pretty useless in attempting to correct this problem. About the most they will usually do is replace the MAF sensor while your still under warranty.) I have been thru all of the above with the exception of having a chip burned, and still run 89 octange on a regular basis to keep from having any problems with predetonation. For whatever reason, my truck just likes a little more octane.