I've been having an issue with my 2004 F-150 XLT 4x4 5.4 3v.

When i accelerate it sounds like a can of nails rattling. Its not the wheel hub, and I got the new IWE solenoid. Its not anything that is loose.
Heres a link to what it sounds like... (Its my video of my truck)


If you had this issue please help!

 

Timing chain?

 

Check heat shields around your cats and exhaust when the weld crack on them they tend to rattle.

 

That's what my dad says it is.

I check the heat shield. Its not loose.

 

If not that, your cats have broken apart into pieces inside. Mine sounded like this when I found the cat to breaking apart slowly. Eventually a large piece came off and plugged the whole exhaust.

 

I have the exact same noise (see my post from today). I know for a fact that it is not the cats, mine have been replaced.

I believe mine is spark rattle from the timing being way off.

 

sounds like detonation on the low end.had that with a non-pi 4.6 sounded just like it.try some 93 to see if it clears up some...

 

I wouldn't try to mask this problem. These motors shouldn't ever have detonation issues unless there is another problem. Even if the check engine light isn't on it could still have a code, I would run a scan and see what the computer will tell you

 

I didnt suggestit as a fix but if it helped he would know more about the problem.And for only 8$ more for a tank or two it dosent cost much ethier,

 

The honeycomb inside one of your CATS is broken. My truck has the same problem and I have been waiting for over 2 weeks now for Ford to send a new passenger side CAT to the dealer so it can be replaced under warranty. Roll down one of you rear windows when you are accelerating, or cruising above 1200rpm. You should be able to hear the noise coming from the tailpipe as well.

If not, it could be a timing / cam phaser issue. Maybe your tensioners are broken and there is slack in the timing chain.

 

Hopefully you're not trying to run a cold air intake without a tune...

 

I'll try 93 just to mark this off the list.
Im near empty anyways.

I've yet to have the time to take it to ford to check the cats but that will be this weekend.

I'll take it to my shop and have them check for codes. Yeah i don't have a check engine light.

I don't have an cold air intake.

BTW,
I also forgot to mention this only happens when i'm in drive. Does not happen when i'm in park and rev the engine.

Also thanks for your input. Greatly appreciated.

 

It's coming from the front end of the motor, has got to be timing related. But you won't know until you get it checked out.

 

Well man i put some 93 half a tanks worth and it cleared about 95% of it up.
It does it at initial acceleration for like a sec if that. Then it stops and it just sounds like i can hear my sexy engine roar now...


So since this was pinging related.. What could it be? What do i need to check/replace?

 

You likely have an issue with the a/f ratio running really lean, or you have a timing issue. Either way, it's not good.