Go Back  Diesel Bombers > Dodge Cummins > 12 Valve 2nd Gen Dodge Cummins 94-98
12 valve with a terrible fluttering paper bag sound from exhaust. HELP!!! >

12 valve with a terrible fluttering paper bag sound from exhaust. HELP!!!

12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

12 valve with a terrible fluttering paper bag sound from exhaust. HELP!!!

  #31  
Old 02-19-2019, 05:40 PM
Bigg Redd's Avatar
Diesel Bomber
Join Date: Oct 2010
Location: TEXAS
Posts: 2,384
Received 298 Likes on 287 Posts
Default

Interesting thread.... and issue.
Have you considered maybe getting a mechanic's stethoscope and probing around in an attempt to "pinpoint" that noise? Just tossing it out there....
There's gotta be a logical explanation...Ö.
 

Last edited by Bigg Redd; 02-19-2019 at 05:42 PM. Reason: more info
  #32  
Old 02-19-2019, 10:43 PM
Newbie
Join Date: Feb 2019
Posts: 9
Likes: 0
Received 0 Likes on 0 Posts
Default

Never had luck with a stethoscope on a 12 valve .
 
  #33  
Old 02-20-2019, 04:41 AM
JBearSVT's Avatar
Diesel Bomber
Join Date: Oct 2010
Location: New England
Posts: 1,316
Likes: 0
Received 59 Likes on 58 Posts
Default

Indeed. Mine doesn't sound like that on a cold start, but that could be because you didn't exactly give it any help in that video. Dunno if you did it that way to reinforce a point or if that's how you always cold start it, but either way- years back we were talking about the sound of exhaust from different brand diesels and someone commented that to them a Cummins sounds like a moose farting in the wind. It wasn't until this topic that I had any idea WTF he meant by it. Regardless, I wonder if it would still do that if you start it according to the owner's manual. As for the TC, I believe his issue doesn't go away with warm up, and only lessens as RPM rise but doesn't go away. So it's possible that his idle is set too low, but it sounds like that is only exacerbating the situation not causing it. .
 
  #34  
Old 02-20-2019, 09:37 AM
Bigg Redd's Avatar
Diesel Bomber
Join Date: Oct 2010
Location: TEXAS
Posts: 2,384
Received 298 Likes on 287 Posts
Default

Originally Posted by cfm56 View Post
Never had luck with a stethoscope on a 12 valve .
Good point!! Doh!!!!
 
  #35  
Old 02-23-2019, 01:08 PM
Newbie
Join Date: Feb 2019
Posts: 9
Likes: 0
Received 0 Likes on 0 Posts
Default

I honestly think its your idle, get a Tach kit for a 12 valve, they arent expensive.
 
  #36  
Old 02-23-2019, 02:52 PM
Fievalfon's Avatar
Diesel Fan
Thread Starter
Join Date: Nov 2018
Location: Las Vegas NV
Posts: 21
Likes: 0
Received 0 Likes on 0 Posts
Default

Thanks a lot again guys for all the replies and the help. I just purchased a hand held tach and if this thing is reading correctly Iím idling at 700rpm with the A/C off. Iím going to bump it up to 900rpm and see how it sounds. I will let you all know how it goes and if it at all remedyís the moose fart 🤣🤣
 
  #37  
Old 02-23-2019, 02:58 PM
Fievalfon's Avatar
Diesel Fan
Thread Starter
Join Date: Nov 2018
Location: Las Vegas NV
Posts: 21
Likes: 0
Received 0 Likes on 0 Posts
Default

Just another quick thought. Might be a dumb question but Iíve always been told no question is a dumb question so would a bad overflow valve not producing the right fuel pressure causing the injectors not to spray enough fuel or atomize correctly cause such an issue? To me it sounds like it could not be firing 100% causing the flapping noise. Truck has 250k miles on it and I have to assume it has never been replaced.
 
  #38  
Old 02-23-2019, 07:02 PM
Fievalfon's Avatar
Diesel Fan
Thread Starter
Join Date: Nov 2018
Location: Las Vegas NV
Posts: 21
Likes: 0
Received 0 Likes on 0 Posts
Default

Well boys, all that happened by bumping up the idle is that it just makes the flutter faster.... I dont know what move to make from here unless someone says the overflow valve could be it but I highly doubt thatís the case.
 
  #39  
Old 02-24-2019, 07:35 AM
JBearSVT's Avatar
Diesel Bomber
Join Date: Oct 2010
Location: New England
Posts: 1,316
Likes: 0
Received 59 Likes on 58 Posts
Default

I doubt it too, but they're cheap.
 
  #40  
Old 02-24-2019, 08:26 AM
JBearSVT's Avatar
Diesel Bomber
Join Date: Oct 2010
Location: New England
Posts: 1,316
Likes: 0
Received 59 Likes on 58 Posts
Default

On a side note, what is your username supposed to represent? I've been scratching my head for weeks trying to figure it out.
 

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.