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-   -   12 valve with a terrible fluttering paper bag sound from exhaust. HELP!!! (https://www.dieselbombers.com/12-valve-2nd-gen-dodge-cummins-94-98/135603-12-valve-terrible-fluttering-paper-bag-sound-exhaust-help.html)

Fievalfon 11-14-2018 10:33 PM

12 valve with a terrible fluttering paper bag sound from exhaust. HELP!!!
 
I have a 96 12 valve Cummins that I purchased about 5 years ago and itís had a strange sound from the exhaust since day 1. Literally sounds like a plastic bag is flapping around inside the exhaust, thatís the best way I can describe it. Iíve researched and researched and researched and googled my ass off for days now with no good leads on a possible cause. Anybody out there ever have this issue or know someone that has? In all my years Iíve never heard a Cummins sound like this so I have no idea....sounds like shit, makes me not even want to drive it. Someone out there please help. I tried uploading a video but the site wonít let me for some reason.

Fievalfon 11-14-2018 11:06 PM

No one out there with a similar issue or idea on a possible problem and solution? Dying to be rid of a sound thatís just down right embarrassing, especially for a Cummins. Iíd like to add that the sound I speak is the same directly out of the turbo with the down pipe pulled. I only mention this because I was certain it sounded the way it did at first due particular bends and such throughout the exhaust system that was causing the issue but itís absolutely not.

JBearSVT 11-18-2018 06:45 AM

I've never heard a 12V that didn't sound like that, particularly with an aftermarket exhaust, but without a sound clip it's hard to say. If it's the same without the exhaust attached though, it must be crazy loud. Is it the stock turbo? Any shaft play? Any oil in the exhaust? Does it run well? Seems very unusual to be coming from anywhere in the combustion chain and not be running like crap, but I've been a lot of miles without encountering it, so maybe someone else will chime in.

Fievalfon 11-18-2018 01:11 PM

Thanks for finally chiming in Jbear. Man, If every 12 valve sounds like this then Iím no longer a 12 valve fan, this thing sounds like shit. Has an upgraded HE351 but the exhaust has sounded this way since the hx35. No shaft play and no oil in the exhaust. Just recently added injectors, delivery valves and afc live and the truck runs great but still sounds like crap. I havenít found a YouTube clip yet of a 12 valve that sounds like mine. If I could figure out how to load a sound clip of mine I would but something tells me you wonít pick up on it in a video.

JBearSVT 11-18-2018 02:08 PM

If you can hear it without an exhaust on the truck it has got to be some kind of loud. Could it be the fan? Anything that turns could be doing it. I've heard alternators that sounded like a supercharger, and tensioners that sounded like a coffee can full of marbles. These things are skeletons now, you just have to keep whacking at them and see what falls off...

Fievalfon 11-18-2018 02:12 PM

No, itís 100% coming from the engine out the tail pipe. Pulled the exhaust and you can directly hear it coming out the turbo. I really wish I could post a video, it might really help explain.

Fievalfon 12-06-2018 11:23 PM

Come on people, help me out
 
Still no one out there that has any thoughts on this issue? Every time I hear a 12 valve and the fact mine sounds nothing like it I get pissed. Someone out there has had to have had some sort of encounter with what Iím dealing with, I canít be the only one can I?

JBearSVT 12-07-2018 05:05 PM

What do you have for an exhaust?

Fievalfon 12-07-2018 11:31 PM

4Ē turbo back to a muffler and then out to 6Ē stacks. But like I stated earlier, I have pulled the exhaust completely off at the turbo and it sounds exactly the same, louder obviously but the same phhh phh phh phh flutter. Many 12 valves I hear even have that cool turbo noise out the end of the pipe when you decel and shift gears and I donít get that in the slightest. I donít know why my truck sounds so different but I am beyond desperate to figure something out here.

JBearSVT 12-08-2018 05:41 AM

I was thinking about a resonation, but on the other hand, I was also drunk. So.

Does it change with load or rpm? Is it the same going down the road as it is at idle?


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