6.0 engine whistle and whine

[good hands]

Leaving for a trip this weekend and need to tow my car. I brought it in to my mechanic and he said the sound I was hearing was it was in need of the bullet proof EGR . 2500 bucks later it is still doing the same thing. It only happens going up a large hill under full power with a 9000lb trailer. No difference in temps on any of the gauges. No other real symptoms. Any thoughts ? Thanks.

[BigRed6.0L]

Sounds like you might have a torn CAC tube boot or maybe even a cracked intercooler

[hughesis23]

Is there any noticeable loss of power during this? What year truck?

[good hands]

2006. Yes it really struggles going up a hill.

[kingranch250]

This is off topic but 2500 for egr delete is crazy!

[good hands]

Originally Posted by kingranch250

This is off topic but 2500 for egr delete is crazy!

My mistake. It is the bullet proof egr not the delete. oil cooler was changed, Seals, screens and o rings changed, EGR passages cleaned. oil change and lube done too.

Still sound ridiculous ?

This is my first diesel truck so I hope I can trust these guys.

[kingranch250]

Originally Posted by good hands

My mistake. It is the bullet proof egr not the delete. oil cooler was changed, Seals, screens and o rings changed, EGR passages cleaned. oil change and lube done too.

Still sound ridiculous ?

This is my first diesel truck so I hope I can trust these guys.

Sounds a lot better I just did all mine at one time studs egr etc. Was
1500 labor I supplied my parts that labor is cheap done by a buddy of mine that has his own shop and does it every day

[good hands]

The prior owner did the studs. I also have records that he replaced the EGR under waranty but it was replaced with the same Ford part. Pretty stupid if you ask me.
I am taking my mechanic for a ride today with my trailer on the truck so I can duplicate the noise. Hopefully we'll have an answer. If I didn't know the EGR needed to be replaced anyway at some point I'd be pretty pissed off that I spent that much money to fix this noise only to have it do nothing.

[Evil Eye]

Sounds like the flex section in either your up-pipe or y-pipe has split. I would also double check your CAC boots and intercooler piping to ensure those are not split or torn.

[a2elvis]

Boost leak or exhaust leak most likely. I have used an evap emissions smoke machine to find air leaks. Seems to be the fastest way to find boost leaks if thats the issue.