Exhaust changing tones - Ford Powerstroke Diesel Forum
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post #1 of 17 Old 03-23-2010, 11:22 AM Thread Starter
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Exhaust changing tones

I have a 5" MBRP turbo back exhaust and recently put a muffler on it. I have noticed that when the truck is idling the exhaust sound changes to a deep throaty noise that you would expect to come out of a gas truck. This only last for a few seconds and then the turbo noise kicks back in and the truck sounds normal. Any ideas on what this could be?
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post #2 of 17 Old 03-23-2010, 11:24 AM
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Originally Posted by rolltideroll989 View Post
I have a 5" MBRP turbo back exhaust and recently put a muffler on it. I have noticed that when the truck is idling the exhaust sound changes to a deep throaty noise that you would expect to come out of a gas truck. This only last for a few seconds and then the turbo noise kicks back in and the truck sounds normal. Any ideas on what this could be?
It's the vanes opening and closing (cycling) in your turbo. If I'm wrong I will sell my truck for $3.00 to the person who corrects me..
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post #3 of 17 Old 03-23-2010, 11:29 AM
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It's the vanes opening and closing (cycling) in your turbo. If I'm wrong I will sell my truck for $3.00 to the person who corrects me..
your wrong. i dont feel like going into details but do you take paypal?

thats kind of odd. so it changes tone while runing? why i start mine up it has a deep v8 rumble for like maybe 3 or 4 seconds before turbo kicks in but that tone never comes back at idle after the truck has been started
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post #4 of 17 Old 03-23-2010, 11:45 AM
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Originally Posted by mx730md View Post
your wrong. i dont feel like going into details but do you take paypal?

thats kind of odd. so it changes tone while runing? why i start mine up it has a deep v8 rumble for like maybe 3 or 4 seconds before turbo kicks in but that tone never comes back at idle after the truck has been started
In all reality, I will sell my truck for cheap.... Reason being??? It doesn't run.. lol
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post #5 of 17 Old 03-23-2010, 12:07 PM
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As mentioned, that's the vanes in the turbo. When the truck first starts, they're in a position optimal to starting. Once the motor begins idling and the computer has "caught up", so to speak, the vanes change their pitch and the exhaust note changes.

During idling, the vanes will change pitch slightly based on system conditions and you'll hear the exhaust note change during these times.

Perfectly normal.
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post #6 of 17 Old 03-23-2010, 12:48 PM
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the new flash VXCF9 causes the VGT solenoid to cycle and causes that sound itll do it every time you start your truck from the exhaust but itll do it in park and idle at stop light or somethin like that as well. Perfectly normal it does it to keep the vanes from clogging or at least try to stop it from clogging.
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post #7 of 17 Old 04-13-2016, 03:08 PM
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I know this is an old thread but I am am having this same issue. It's always done it at idle but now it's doing it off and on while driving.

Anyone had that issue?

2006 e350 6.0 with 230k

Edit.. cel is on now. Will have it checked tomorrow. I'll bet it's a vgt solinoid code.


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Last edited by offroadohio; 04-13-2016 at 03:33 PM.
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post #8 of 17 Old 04-15-2016, 07:14 AM
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Yep vgt solinoid code


What are the odds I need a solinoid and the turbo is o


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post #9 of 17 Old 04-15-2016, 07:39 AM
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Odds are pretty good that you'll need a solenoid, if there's no other problems at you may need a new unison ring as well if that's the orig. turbo @ 230k.

Good thread revival


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post #10 of 17 Old 04-15-2016, 07:44 AM
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It is not the original turbo although I am not sure how many miles are on the reman that is in it.

I can still hear it going which makes me assume that it is ok but I don't have a boost gauge so I'm not sure what is putting out

I know absolutely nothing about turbos

But I have had the turbo off Anna part 1 and I didn't see any visible issues or grown up that would prevent it from working however that was about 20,000 miles ago


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Last edited by offroadohio; 04-15-2016 at 07:47 AM.
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