4.7 Leaking Head?

Dude, I'm telling you, there's an extremely high chance this is the coolant crossover lines at the back of the engine. It's happened to several other people here. In 5+ years of posting on here - look at my post count dude, I'm a friggin' slave to this place - I've seen all of maybe three head or head gasket issues? It's extremely unusual with the 4.7, much more common with the 5.7

If you're open to doing the work - you've got the 2000-2004, which is far easier to pop the intake on than the 2005-2006 - it's not a hell of a lot of work. @bmf4069 is one person I can think of that's done it several times. You should replace the lower intake gaskets if you do, which is inexpensive (don't use aftermarket, this is why BMF had to pull his intake two of the four times I know he's done it now, aftermarket intake gaskets failed in no time at all).

I'm not as familiar with the 2000-2004 because I don't have one, but I can't help but wonder if you can use a mirror to look at those spots while running and the pedal held at 1000-1500 RPM, and peer for leaks before taking action. OR maybe wad up some paper towels and press them up into both joints (one toward each bank) to see if you see coolant; if you do, you know that's the issue.

This is really not an expensive or complicated issue to fix. And it's a common-enough issue. It's just tedious popping the lid. @bmf4069 can give some tips. There's also quite a few videos I've seen on YouTube addressing the subject, and we've also linked (3rd bullet point in reply #11 above) the exact problem I suspect this will end up being. But here's that link, to save you some scrolling: https://www.tundras.com/threads/coolant-leak-by-trani-1st-gen-4-7.92524/page-2#post-2334948

 

Oh, and on that link (this one) if you go to the 1st page of that thread, he was able to use a mirror at the back of the engine AND look between the intake runners to see there was clearly pink dried coolant and/or leak back there.

 

If you do end up pulling the intake, take the opportunity to wrap the wires down there in Rodent tape. Critters love to chew on those wires.

 

I bet I could have that intake of in 15 minutes at this point. Like he said, oem or felpro on them gaskets.