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Old 06-27-2013, 05:33 PM   #1
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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
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Old 06-27-2013, 05:35 PM   #2
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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, 2018 Honda CRV . Full timers since Jan 2012.
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Old 06-27-2013, 06:07 PM   #3
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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
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Old 06-28-2013, 08:39 AM   #4
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it is a 2004 National sea breeze lx 35 ft. on a W22 work horse chassis with a vortec engine
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Old 06-28-2013, 08:50 AM   #5
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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.
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Old 06-29-2013, 06:57 AM   #6
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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
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Old 06-29-2013, 07:40 AM   #7
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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.
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