flutter noise
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Joined: Jun 2003
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From: boyce LA
flutter noise
Hi,
I have a 1999 f350 7.3. The muffler has been removed and replaced with a pipe. The problem I have is a flutter or "popcorn like" noise when pulling a heavy load, mainly uphill. It don't seem to have the power it once did.
The noise is low pitched sound almost like popcorn popping. It is not loud, you can barely hear it. Maybe from the exhaust or turbo.
I know this sounds strange, but I hope someone knows what's going on.
Thanks,
Charlie
I have a 1999 f350 7.3. The muffler has been removed and replaced with a pipe. The problem I have is a flutter or "popcorn like" noise when pulling a heavy load, mainly uphill. It don't seem to have the power it once did.
The noise is low pitched sound almost like popcorn popping. It is not loud, you can barely hear it. Maybe from the exhaust or turbo.
I know this sounds strange, but I hope someone knows what's going on.
Thanks,
Charlie
Postmaster
Joined: Feb 2002
Posts: 2,773
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From: Bonney Lake, WA
The fluttering sound you're hearing is normal, and your truck has been making that sound all along. It's just that you're hearing it now that the muffler has been removed. The exhaust passes through the turbine blades of your turbo before exiting the vehicle. In the process, the exhaust stream is cut into little bitty chunks, creating the flutter. It's a similar sound, and concept, to talking into a fan. You can't really do away with the sound. You do have two choices, though: one is to create enough restriction in the exhaust system to flatten out the pulses, or learn to live with it.
Try to think of it as a unique Powerstroke sound, it might make it easier to live with.
Try to think of it as a unique Powerstroke sound, it might make it easier to live with.
Elder User
Joined: Feb 2004
Posts: 573
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From: Spring City, Pennsylvania
I think that with a turn down style tip you're aiming the sound directly at the ground and the exhaust sound is 'grounded out' so to speak. I know a few people that have straight piped exhausts and found them a little overwhelming at high RPM's. So they tried to turn down tip and didn't mind the 2100-2300 RPM exhaust note after that.
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Joined: Feb 2002
Posts: 2,773
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From: Bonney Lake, WA
I did the "turned down tip on a straight piped truck" thing, and everything was great, until my wife needed to use the truck, and I heard how the truck sounded from the outside.
I had a muffler laying in the driveway before she got home, and was putting it on before the engine got cold.
Merely aiming the sound away from you doesn't change the sound, it merely makes it so everyone else can laugh at you, without you knowing why.
That's only my opinion, of course, but I couldn't hack the flutter at all.
I had a muffler laying in the driveway before she got home, and was putting it on before the engine got cold.
Merely aiming the sound away from you doesn't change the sound, it merely makes it so everyone else can laugh at you, without you knowing why.
That's only my opinion, of course, but I couldn't hack the flutter at all.
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