I have a 2005 CTD, and was towing my 5th wheel home this weekend. The turbo started making a blowing sound under acceleration. I'd hear the normal whine while cruising at 1600-1800 RPM, then the whine would turn to a blowing sound as I hit 2100+ RPM. It almost sounded like a vent inside the passenger side of the cab was blowing, if that helps diagnose the issue.

I can't quite tell if I lost power when this kicked in or not. Once or twice it felt like the case, but those were steeper climbs.

Thanks in advance.

 

That may have been your radiator fan clutched in. Those fans move quite a bit of air and are very noisy. The fact that you were towing points to this as well.

 

Note that after quite a few towing trips, this is the first time I've ever heard it. And this is not the hottest weather I've towed in either. I forgot to mention that I can now reproduce the effect when NOT towing. Same RPM range.

Also, this is a stock truck. Only thing aftermarket is the hitch and air bags...

 

Ahh, that is a horse of another color. Have you pulled the intake hose off the turbo and checked for anything out of the ordinary? Does the turbine spin freely, any play in the shaft, oil collecting inside the turbo (this indicate and seal/bearing going south on ya).

 

Check the clamps that hold the hoses on to the intercooler. If they aren't good and tight, they can leak and that will give you the blowing sound.
Been there and done that.

Shortround out

 

shortround is correct.........boot leak on intercooler. Feel around each connection and you will probably find where the boot is partially out of the clamp.

Waylan

 

I knew I forgot something. The boots. There are 4 of them, be sure and check each for a loose clamp or torn rubber.

 

Happened to me and I thought it was the fan clutch too...took it to DC and that was the first time I learned what a boost leak sounded like...bottom intercooler boot came loose...

 

Hopefully it IS a boot and not your intercooler. Good luck.

 

Thanks guys...sounds like a majority vote on the intercooler boots. I'll check that out in the morning. If I can't find it, I'll swing by the dealer.

So far, so good on this site!