Engine noise when letting off throttle
Junior User
Joined: Aug 2004
Posts: 83
Likes: 0
Originally Posted by jjsj38
i have an "05" truck with 17,600 and the same noise was heard. When you let off the throttle, it sounds like the fan blade hitting the shroud or something. took it the dealer and they replaced the turbo.
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New User
Joined: Jul 2006
Posts: 7
Likes: 0
Some of you have mentioned that you should get the turbo change soon due to getting close to the 36k warrenty... I just got off the phone with ford and they assure me that the turbo is covered under the 100k warrenty. And they argued with me that its normal How are you convencing your dealers to install a turbo when there saying theres no problem?
New User
Joined: Jul 2006
Posts: 7
Likes: 0
i guess i can assume that your talking about them hooking it up to diag. and them getting a their Rx (feedback) from the sensors. I would just need to get the truck in and ask them to hook it up and play with the throttle and see if they get a code. All i know is that it gives me an uneasy feeling everytime i hear it. So if it's not right i better do something about it.
Junior User
Joined: Dec 2005
Posts: 75
Likes: 0
well dang it,I thought this was normal sound,because the deisel tech at my dealer road with me and i got on the gas and let off for him to hear the whapp whapp whapp,he looks at me and said its completly normal.so should i take it some where else,i mean its running good,btw its 2006 xlt f250,with 8500 miles and the farting noise didnt start till 3k miles
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Tuned
Joined: Dec 2003
Posts: 465
Likes: 1
From: Metro DC
Mark's normal test:
New, the truck didn't wappa.
The wappa started around 24K miles.
Diag codes showed boost issues.
Dealer replaced turbo.
No more wappa.
Recap: Didn't make the noise new. Then did. Turbo replaced. Noise gone.
If the noise is normal, perhaps I should ask for my old stuck-vane turbo back! It is not normal just because a lot of them might do it. It may be familiar, but it's not supposed to happen.
New, the truck didn't wappa.
The wappa started around 24K miles.
Diag codes showed boost issues.
Dealer replaced turbo.
No more wappa.
Recap: Didn't make the noise new. Then did. Turbo replaced. Noise gone.
If the noise is normal, perhaps I should ask for my old stuck-vane turbo back! It is not normal just because a lot of them might do it. It may be familiar, but it's not supposed to happen.
Junior User
Joined: Aug 2004
Posts: 83
Likes: 0
Originally Posted by mrc59
From what I've seen, if there are codes, you get a new turbo. It doesn't benefit the dealership to deny real work. If you have the "need more info" code, they may want to wait. But it's not "normal"!
Cargo Master
Joined: May 2006
Posts: 2,116
Likes: 6
From: Florida
answer. Look at all of the; it's a normal sound responses and all of the turbo replaced responses fixed it. Some of you guys need to go get your truck fixed. The noise described in this thread is NOT normal for a correct functioning "air management" system on your stock 6.0. Unless you have a sticking VGT or you are over boosting (over speeding the turbine driver) the turbo with high performance parts the VGT is designed to control turbine speed and will not make the noise you are describing. Ford, Navistar designed air to flow into the motor not in and then back out of the motor when you let off the throttle. The waste gated 7.3 uses a waste gate to control turbine speed by releasing boost out the exhaust, the 6.0 VGT controls turbine speed by the electronic oil actuated opening and closing position of its vanes to control turbine speed. If the opening and closing response is operating properly like my truck does you cannot make the fan rubbing chopper sound being described here. fficeffice" /><O></O>
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New User
Joined: Mar 2006
Posts: 6
Likes: 0
The noise in itself is not the BIG problem. It is the loss of boost at low RPM that robs power, and milage.
When the noise is present there is very low boost at low RPM. At times when the turbo is working properly at low RPM there is 3-4 times the boost than when it is not.
This is evidenced by watching the guage on the dash. You can see the boost jump up at about 1500 rpm. Not rise evenly through the power curve.
When the noise is present there is very low boost at low RPM. At times when the turbo is working properly at low RPM there is 3-4 times the boost than when it is not.
This is evidenced by watching the guage on the dash. You can see the boost jump up at about 1500 rpm. Not rise evenly through the power curve.
Freshman User
Joined: Oct 2005
Posts: 36
Likes: 0
From: Maryland
Basscat has it right. Hey all of you still out there "turbo farting" down the highway. If your Ford Service says it's normal, find another FORD Service Center. Too many of us heard that story that it is normal. I suffered with it for 15K miles. Ford Service replaced the EGR as well as the turbo, now no more wa-pa-pa all the way home. 