Moan/drone from exhaust - Ford Powerstroke Diesel Forum
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Old 11-09-2007, 07:02 PM
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Moan/drone from exhaust

I just picked up my truck from the dealer after they've had it a week trying to repair a droning noise coming from the exhaust. It's still doing it after they pulled the turbo and cleaned it.

It's not super loud, but it's extremely annoying. You can hear it at lower speeds mainly. It's like a medium pitch resonating drone that corresponds to turbo boost. You can hear it as it spools up and as it's spooling down. If I power brake it, it makes the noise then too, so it's definitely not coming from the driveline. It does when you rev the engine in park, but it's a lot worse under light load, like accelerating from 20-30 MPH under light throttle.

On the test drive with the tech, it wasn't doing it badly, and he said the noise I heard was normal turbo noise, but after driving another identical truck, I know this is not normal. My cousin's 05 Powerstroke does not make any noise at all other than a little turbo whistle.

Do any techs have any ideas what else could be causing this? I did notice Ford has a bulletin about this exact issue, but I can't find the text of it. The bulletin is titled "Turbo-Induced Exhaust Moan/Drone At 1500-2000 RPM Bulletin. FCS121780519 - Technical Service Bulletin #2005-19." Should I try to get my tech to change the turbo? This noise is driving me nuts.
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Old 11-09-2007, 07:09 PM
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Bogged turbo sound

I brought our 05 E-350 ambulance into the dealer for the same sound. you described it to the tee. mech. gave me the runaround. that was new. we have 65,000 miles now. it still makes the noise, but nothing has launched yet.
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Old 11-09-2007, 07:10 PM
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Found this on another forum. Hope it helps!!

05-19-12***TURBO-INDUCED EXHAUST MOAN/DRONE AT 1500-2000 RPM - 6.0L BUILT AFTER 9/29/2003
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Old 11-09-2007, 07:16 PM
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My truck recently developed a moan/drone (sounds like a faint, wailing ghost sorta) that kicks in around 1500 rpm and disappears by 2000 rpm. I don't get it. The trucks performance hasn't changed. But the sound is new, and a little annoying when I notice it (when the stereo is off or turned down) I drive it hard and open it up plenty. I also use a fuel additive at every fill up and B20 when I can get it. I would figure my turbo is nice and clean from doing these things? Maybe I just need to really really race the sh*t out of it and keep the EGT's upwards of 1000* for more than a few minutes to really clean it out? Could the vanes be sticking and that's causing the faint moaning? It's an '06 truck so it shouldn't need a new pedestal or anything like that?


Edit: guess maybe I'm one of the one's that needs the A-brace??? Or maybe to hell with the A-brace and I just live with it?

Last edited by DieselViking; 11-09-2007 at 07:19 PM.
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Old 11-09-2007, 07:44 PM
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Quote:
Originally Posted by matt1030 View Post
Thanks. That's the exact ammunition I need to make the dealer do something. I'm highly annoyed that they didn't know enough to check for TSBs. They were supposed to pull and clean the EGR too, but they didn't do anything but clean the turbo. They're definitely not getting another 100 bucks out of me. They should have known how to fix it the first time.


Viking, I'd make them fix it. 10 to 1 they will try to say yours is just coked up too. I'd print out the TSB and bring it to them. The noise in mine just started recently too. It's getting progressively worse over time.
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Old 11-14-2007, 09:02 AM
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I had the same situation with my 04. It started after the dealer had it for a few days changing the turbo and a couple of injectors and other pieces. That was at 30,000. I now have 40,000. My last trip down with the trailer it was really loud at idle just running there in the driveway cooling down the turbo. I went over and put my foot on the tailpipe and was able to change the sound. I put in some time on the computer on several powerstroke sites and someone mentioned aligning the exhaust in one of the threads.
So I decided to give it a try. I loosened the clamp at the cat and the clamp at the turbo exit. I just jiggled it around a bit and started the engine while loose. Then tightened the clamps. It was quiet. The next day(yesterday) I drove it down to fill the tank and noticed that the buzz was back. I decided to give it another try with it hot. Same deal, loosen the clamps and start the engine. I carefully tightened the clamp bolts at the cat a little on each side while listening for the buzz. Too much on one side and it would buzz. Then I snugged up the clamp at the turbo. Off I went on a 250 mile trip with my trailer. Noise gone. GONE! What a difference. I feel like a idiot for not doing this ages ago.
So, try aligning your downpipe with it hot and the engine running. It worked for me.

Last edited by mr.c; 11-14-2007 at 10:47 AM.
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Old 11-14-2007, 07:55 PM
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Quote:
Originally Posted by mr.c View Post
I had the same situation with my 04. It started after the dealer had it for a few days changing the turbo and a couple of injectors and other pieces. That was at 30,000. I now have 40,000. My last trip down with the trailer it was really loud at idle just running there in the driveway cooling down the turbo. I went over and put my foot on the tailpipe and was able to change the sound. I put in some time on the computer on several powerstroke sites and someone mentioned aligning the exhaust in one of the threads.
So I decided to give it a try. I loosened the clamp at the cat and the clamp at the turbo exit. I just jiggled it around a bit and started the engine while loose. Then tightened the clamps. It was quiet. The next day(yesterday) I drove it down to fill the tank and noticed that the buzz was back. I decided to give it another try with it hot. Same deal, loosen the clamps and start the engine. I carefully tightened the clamp bolts at the cat a little on each side while listening for the buzz. Too much on one side and it would buzz. Then I snugged up the clamp at the turbo. Off I went on a 250 mile trip with my trailer. Noise gone. GONE! What a difference. I feel like a idiot for not doing this ages ago.
So, try aligning your downpipe with it hot and the engine running. It worked for me.

This might be exactly MY problem too??? Read my recent post in this forum entitled "Vibration: Muffler not cure" Dadgumbit, I think you presented a solution! I'm gonna try what you tried man and see what happens. Oh I hope it works...
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  #8  
Old 11-14-2007, 08:01 PM
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noise

2 questions to start off. Does your truck have the factory exhaust and do you have a hide away hitch in your bed?
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Old 11-14-2007, 08:07 PM
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Well Marc gave me the same advice but I did it cold I will have to try it after it warms up. Thanks for the post you dont know how happy I will be if I can put change in my ashtray again. I cant stand the noise it makes with this idle vibration.
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  #10  
Old 11-14-2007, 08:09 PM
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What does the hitch do I have aftermarket exhaust see thread?
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