Compression Ignition Addict
Join Date: Jul 2007
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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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