RV Trip Planning Discussions

Go Back   iRV2 Forums > THE CHASSIS CLUB FORUMS > Freightliner Motorhome Chassis Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
 
Thread Tools Search this Thread Display Modes
 
Old 08-16-2019, 09:41 AM   #1
Senior Member
 
Kahoona's Avatar


 
Freightliner Owners Club
Join Date: Jul 2015
Location: Conch Republic
Posts: 1,055
Chuffing sound from rear when driving.

When I first start off from a stop I am hearing a sound like either scraping soft material or venting air but quieter. At first it goes in time with wheel rotations then levels out until about 10mph in spite of the wheels going faster. After about 20mph I hear nothing. Any ideas? I wondered about compressed air venting but didn't think it would be able to continue like that. The dryer has 23,000 mi on it and I have not replaced it yet. Scraping brakes would continue to increase in speed, not level off. We are traveling so I am nervous about it. Anybody else hear that on their rig?
__________________

__________________
33' 2008 National Tropical on a Freightliner chassis.RVM#189
Kahoona is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 08-16-2019, 10:07 AM   #2
Senior Member
 
Join Date: Jan 2018
Posts: 1,269
Sounds like maybe a boost leak. As you pick up speed the road noise doesn't stop, but it becomes hard to hear because of the wind and road noise.


Have one person drive and the other listen from over the engine. If it is a boost leak it increases with more throttle.
__________________

__________________
Been through all the continental states and provinces. Rinse and repeat. Present coach 2018 VTDP 3407.
Finance is offline   Reply With Quote
Old 08-16-2019, 10:43 PM   #3
Senior Member
 
Kahoona's Avatar


 
Freightliner Owners Club
Join Date: Jul 2015
Location: Conch Republic
Posts: 1,055
Quote:
Originally Posted by Finance View Post
Sounds like maybe a boost leak. As you pick up speed the road noise doesn't stop, but it becomes hard to hear because of the wind and road noise.


Have one person drive and the other listen from over the engine. If it is a boost leak it increases with more throttle.
Boost as in turbo? I will have the DW listen when we move it next on Tuesday or Wednesday and post the results. Is a boost leak dangerous?
__________________
33' 2008 National Tropical on a Freightliner chassis.RVM#189
Kahoona is offline   Reply With Quote
Old 08-16-2019, 11:59 PM   #4
Senior Member
 
Join Date: Jul 2014
Posts: 18,588
A boost leak would be from the turbo plumbing. Its only filtered air so not dangerous but it will rob power from the engine.

There are a few short hose connections, between the 3" pipes, that can leak, causing a noise.
Quote:
Originally Posted by Kahoona View Post
Boost as in turbo? I will have the DW listen when we move it next on Tuesday or Wednesday and post the results. Is a boost leak dangerous?
twinboat is offline   Reply With Quote
Old 08-17-2019, 01:43 AM   #5
Senior Member
 
Kuzzy's Avatar
 
Triple E Owners Club
Join Date: Jul 2013
Location: Nanoose Bay B C
Posts: 354
Do you have Centramatic wheel balancers?
I used them years ago and they sounded similar to what you are describing.
Kuzzy is offline   Reply With Quote
Old 08-17-2019, 08:18 AM   #6
Senior Member
 
Kahoona's Avatar


 
Freightliner Owners Club
Join Date: Jul 2015
Location: Conch Republic
Posts: 1,055
Quote:
Originally Posted by Kuzzy View Post
Do you have Centramatic wheel balancers?
I used them years ago and they sounded similar to what you are describing.
Good question.I hope so. I looked at the website. I don't have balance weights so I must have those or beads. I'll look and see. The DW says it is louder in the bedroom.
__________________
33' 2008 National Tropical on a Freightliner chassis.RVM#189
Kahoona is offline   Reply With Quote
Old 08-20-2019, 06:44 PM   #7
Senior Member
 
Kahoona's Avatar


 
Freightliner Owners Club
Join Date: Jul 2015
Location: Conch Republic
Posts: 1,055
Quote:
Originally Posted by Kuzzy View Post
Do you have Centramatic wheel balancers?
I used them years ago and they sounded similar to what you are describing.
No Centramatics. I checked.


Quote:
Originally Posted by Finance View Post
Sounds like maybe a boost leak. As you pick up speed the road noise doesn't stop, but it becomes hard to hear because of the wind and road noise.
Have one person drive and the other listen from over the engine. If it is a boost leak it increases with more throttle.
The chuffing does stop after up to a dozen chuffs.Throttle makes it into a longer chufffff sound


Quote:
Originally Posted by twinboat View Post
A boost leak would be from the turbo plumbing. Its only filtered air so not dangerous but it will rob power from the engine.

There are a few short hose connections, between the 3" pipes, that can leak , causing a noise.
I will get the DW's stuff out from under the bed and open the hatch to look.


Here are some things I have found.
It is the same sound as the air pressure relief. I have not changed the dryer yet as it only has 24,000 mi on it but it is an 2008.I have a new one, just not installed yet.
If I put the coach in neutral while at the stop and keep my foot on the brake it will not make the noise.
It only started about a thousand miles into this trip.


Does any of this suggest anything?
__________________
33' 2008 National Tropical on a Freightliner chassis.RVM#189
Kahoona is offline   Reply With Quote
Old 08-21-2019, 07:27 PM   #8
Senior Member
 
Kahoona's Avatar


 
Freightliner Owners Club
Join Date: Jul 2015
Location: Conch Republic
Posts: 1,055
I found some discussions about boost leaks and folks were talking about checking the boost level via the dash digital display. I have the Freightliner display. I have never been able to make any sense of it. Spent an hour and a half while on the Cape May Lewes Ferry. The DW tried to wade through the book to find out how to find the boost level or anything for that matter. I'd love to be able to work it. Are their any online courses about using that? The Manual makes me crazy!
__________________

__________________
33' 2008 National Tropical on a Freightliner chassis.RVM#189
Kahoona is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Is this just our RV? No sound on TV while running Generator while driving? vanbuskirk Technology: Internet, TV, Satellite, Cell Phones, etc. 5 09-06-2016 01:52 PM
Dash sound system and surround sound amp beau2x Winnebago Industries Owner's Forum 0 08-24-2015 03:17 PM
Whistle sound when driving Tenrv Monaco Owner's Forum 12 09-03-2012 07:59 PM
No Sound From Radio or Surround Sound DavidC1225 Winnebago Industries Owner's Forum 15 01-19-2011 10:06 AM
Tick-tick-tick sound in surround sound speakers wagonmaster2 Winnebago Industries Owner's Forum 22 01-17-2010 07:19 AM

» Featured Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:41 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.