Yesterday when I pulled into the parking lot at the golf course a guy came up to me and asked me if I had had my truck in the shop for 'that noise'? Asked him what noise. He said, 'when you pulled in, your truck made the same noise mine does'. (He has an 05 F250 also).

I confessed I had never heard it, but usually had the windows up with radio on.

Today when leaving work I happened to have the window down, and radio off. I was going maybe 20 or so, then let off the pedal. Heard what I at first would describe as a tire rubbing sound. Gave it some power and let off a couple more times and heard the same sound each time. Tried to get it to happen again after getting closer to home on some less busy streets. No luck.

Truck sat for an hour or so (90+ degrees here today). Tried again. At first no success, then it happened twice, same circumstances.

Will of course take it in to have it looked at, but wondered if any of you have experienced the same type thing and what might be the cause.

Am fairly certain that it isn't a tire rubbing, but that's the closest I can come to describing the sound. Appears to come from front drivers side. Maybe transfer case? Any ideas?

Thanks always,
dlp

 

yes im pretty sure its just the turbo, does it sound like a turkey gobble and its normal but it usually happens in manuels. does it do it when you boost up then let off real quick if so its ok its just the turbo.

 

Hold your foot very 'FIRM' on the brake.. (Do this in the street with 'nothing' in front of you).. Bring the RPM's up fairly 'hard' holding the brake 'TIGHT' (the more throttle the easier it'll occur) and quickly 'chop' or let off the pedal.. (Don't powerbrake for extended periods of time, as trans. temps rise quickly).. If you hear a 'flapping' type noise it's called Turbo Bark.. It happens when you bring the turbo boost pressures up, either by 'power braking' or under normal moderate/hard throttle/accellerating conditions and letting off.. The extra boost pressure has no where to go and backs out the intake..

A normal condition for the VGT as per Ford, although some are more prone to this condition.. This system has no 'waste gate'.. Mine seems to do it more cold, but haven't heard it towing ect. when you'd think it would be the most noticeable.. Under normal driving conditions, I rarely hear it unless I start to merge or cross an intersection and change my mind and back out of the throttle.. Usually pretty slight.. We have an 04 in our fleet that does it warm/cold on just a moderate accell. and backing off.. Almost all the time..

...................HP.................

 

I agree with the others, sounds like the turbo. I noticed mine the first time when I was accellerating up a hill and had to let off quickly because of a corner in the road. I heard the huffing noise. Startled me for a bit until I figured out that it only happened everytime I let off the pedal quickly after the boost had built up.

 

Thanks all. I was able to reproduce on demand using hayapower's advice so I'm going to forget about it and call it normal.

Sound like a turkey gobble? I guess sort of, although if I was out hunting them and heard one that sounded exactly like this, not sure I would want him!! On the other hand, with my luck the last several years, I would take whatever I could get.

 

I had a clicking sound coming from my frontend this last weekend. While I was washing the front wheels I accidently half way engaged the locking hub. I though something was really messed up, my stupidity i guess.

 

DL, the noise you describe is exactly how I described my truck doing this (tire rubbing noise). I believe the noise you are hearing is a result of your turbo's vanes sticking. To often people describe this sound as being "turbo fart". The noise you are hearing and the sound of "turbo fart" are not the same... My truck developed this problem while running fine... After a trip to my service department I was told it pulled no codes... I continued to drive the truck until the noise became much to often worse... After another trip to the service department I convinced them that my truck did not make this noise the first 14,000 miles and I wanted to know why now...

Long story short they replaced EGR valve and EBP sensor (truck continued to make this sound)... A new turbo was ordered and installed which got rid of the noise...

 

Matt (PSD 60L Fx4) has described the Turbo specified tolerances as being strictly adhered to in mfg....or NOT!

Kinda luck of the draw I suppose.

Glad you got a good one now.

 

i consider it a more of a "wa pa pa pa" sound instead of a gobblegobblegobble

 

The written word is just amazing sometimes...Don't you think?

 

Hey BASS.
How did they finally diagnose the turbo as being bad? I have the turbo bark, but the tire rubbing sound is happening when going up certian hills, and is distinctly different. Is this what yours did? Truck seem to run fine otherwise, but I don't want a scrambled turbo!!!!!!!!!!

 

Lol i like the gobble reference

 

Tiny, my service department tried to tell me the noise was normal after being noise free for 12'000 miles... They replaced the EGR valve twice, reflashed my PCM replaced the EBP sensor and VGT solenoid... None of these actions solved the noise my turbo made... After the reflash it did help at first (increased pulse width to injectors) but eventually the noise came back in full and I'm talking in less than 30 miles of driving... My truck lost power but cleared up after I shut the motor off and restarted...

Ford does not want to replace these "turbos" at $2200.00 a pop, so as you can see they tried to replace everything but the turbo in hopes it would solve my trucks problem... I told my service department manager that my truck would not get on the freeway one morning in rush hr. and basically put the ball in their hands that if I got my butt ran over they would be held accountable... They ordered a new "turbo" installed it and my truck is back to normal NO NOISE... I inspected the bad turbo and the vanes were carbon sooted up causing the vanes to stick....

These turbo's are designed to operate no greater than 25 to 27 psig of boost... If during high accelleration the turbo fails to open fully boost will exceed its design operating range and it has no where to exit therefore creating the noise were describing... My truck not only made this noise on quick deceleration but it had begun to do it on acceleration as well...

Bottom line I tell friends if your truck starts making an unusual noise that was not there from new I would be concerned... Call different service departments until you find one that will look at your truck objectively... Unfortunatley I believe these trucks have to be ran like you stole it in my opinion, use fuel additive, avoid excessive idling (wet stacking) and change your oil 4 to 5000 miles... My 2 cents sorry for the rambling....

 

yes while pulling a heavy load before the new turbo, i could hear it whuffing every 4-6 seconds, one huff at a time, until i got up the hill. you could feel the truck hesitate when it did that. who's idea was it to non-wastegate this turbo? >

 

My truck has run perfectly, no complaints at all (well, maybe fuel mileage, but it's not horrible and I hope it gets better as my 03 did).

Only time I hear this noise is if I increase boost and then quickly let off. I guess maybe I'll run by the dealer and see if someone will take a ride with me.

I don't want to ignore a potential problem, but I don't want to be without my truck unless needed either....

Turkey gobble? Tire rubbing? I just don't know the best way to describe this noise.