Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
Thread Tools Search this Thread Display Modes
Old 06-27-2013, 05:33 PM   #1
Junior Member
Join Date: Jun 2013
Posts: 2
bumps in the road

I need some help when i hit a bump at high way speed my class A MH starts bouncing front to back any suggestions on what may be causing this,tire pressure is at105 psi

steadyhand 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 06-27-2013, 05:35 PM   #2
Community Moderator
bdickson's Avatar

Thor Owners Club
Ford Super Duty Owner
Join Date: Apr 2012
Location: Wherever the rig is parked
Posts: 6,648
Originally Posted by steadyhand View Post
I need some help when i hit a bump at high way speed my class A MH starts bouncing front to back any suggestions on what may be causing this,tire pressure is at105 psi
We would need to know the brand of motor home including chassis manufacturer and type in order to be able to help you. If you put that information in your signature line then you will not need to type it every time.

Oh, and welcome to the forum!

Bruce Dickson 2013 Thor Challenger 37GT, 5 Star Tune, Safe-T-Plus Steering Control with Air Trim, Roadmaster front and rear Sway Bars, SuperSteer rear Track Bar, Crossfires, 2012 Honda CRV on Blue Ox Aventa LX tow bar. Full timers since Jan 2012.
bdickson is offline   Reply With Quote
Old 06-27-2013, 06:07 PM   #3
Senior Member
Hooligan's Avatar
Freightliner Owners Club
Join Date: Apr 2002
Location: Pensacola
Posts: 1,965
Most common cause of porpoising:
Symptom: Porpoising over bumps or uneven roads. Porpoising, aka bouncing, dipping, diving. Vehicle keeps going up and down after you go over a bump.
  • Worn shocks or struts, or
  • Broken or slipped leaf spring - inspect leaf springs and repair or replace as needed.
Of course difference chassis/suspension may have various causes, air suspension, ride height etc...
Hooligan, Pensacola, Fl -U.S. Coast Guard 1956-1985
2016 Thor Siesta Sprinter 24ST diesel
Our Pug "Lily" & "George" the Newfoundland
Hooligan is offline   Reply With Quote
Old 06-28-2013, 08:39 AM   #4
Junior Member
Join Date: Jun 2013
Posts: 2
it is a 2004 National sea breeze lx 35 ft. on a W22 work horse chassis with a vortec engine
steadyhand is offline   Reply With Quote
Old 06-28-2013, 08:50 AM   #5
Senior Member
Dmorgan6375's Avatar
Join Date: May 2013
Location: Hickory, NC
Posts: 3,200
Just my opinion here, but for starters i would have to say shocks. Crawl under and with a good flashilght check to see if any of them are leaking, just look for any type of wetness and it will be oily to the touch. Of course check to see if you have any broken springs. If they are all dry, next on my list to consider would be tire pressure and how the load is set up in the rig, maybe to much weight towards the back of the RV along with a full tank of fuel just might cause it to bounce.
Doug & Darlene Morgan RVM96 & Abby Gabby(pooch)
04 Dolphin 6375 LX W-24 Chassis #434136
"The Journey is our Destination"Hickory,NC
Dmorgan6375 is offline   Reply With Quote
Old 06-29-2013, 06:57 AM   #6
Senior Member
rvjimmy's Avatar
Newmar Owners Club
Freightliner Owners Club
Join Date: Mar 2011
Location: Almond, Wisconsin
Posts: 1,440
If it does turn out to be shocks don't scrimp buy good ones. Most people use Koni or Bilstein shocks, I like the Bilstein shocks but I hope that doesn't open up a big debate on which is better. Good luck and safe travels. Jim
2002 Newmar Dutch Star DP3569 330 CAT - Toad Jeep Liberty, DW is the Nagivator. Work to travel and everything revolves around the price of diesel.
rvjimmy is online now   Reply With Quote
Old 06-29-2013, 07:40 AM   #7
Community Moderator
"007"'s Avatar

Nor'easters Club
Workhorse Chassis Owner
iRV2 No Limits Club
Join Date: Oct 2004
Posts: 24,455
Welcome to irv2.
Workhorse had problems with porpoising in the front end when traveling over dips in road.
You need to change the shocks and I would do all four.
I have Bilstein's also would probably change to Koni's now to do over.
My tire pressures are 95 front and 85 rears Michelin's. You maybe a little hard riding on your fronts.

98KSCA, 99MACA, 03 KSCA-3740- 8.1 Chev-- ALLISON Trans, now in good hands
"007" is online now   Reply With Quote

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

» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 06:35 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.