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jtrippy 10-27-2013 02:25 PM

Roaring Sound Under Carriage
During our last trip we noticed a roar sound on and off under our 2300. This is the first time we have heard the sound. We took it to our local RV dealer and he is completely stumped. He said he has no idea. We thought it was just when moving and the motor running. We discovered yesterday, just closing the door started the sound. Any ideas. It is very annoying.

My wife just told me that it sounds like a gas furnace when it first starts up but continues and then quits.

bgilly 10-27-2013 09:18 PM

Check the engine exhaust pipe hangers. The noise might be the rub/vibration of a loose or broken hanger. There are about 3 hanger positions down the coach. You might also check the heat reflector plates. There are at least two heat reflector plates, one as it passes the propane tank and one as it turns to come out from under the coach.

I found my mid-hanger was loose from the exhaust pipe - the J-hook weld broke from the exhaust pipe. Now I have to determine if it is a Forest River fix or a Ford fix since some frame add-on is done after it left Ford.

bclemens 10-28-2013 08:44 AM

I'm guessing that is a FR fix since we handle all of the exhaust work. Heat shields is normally us too.

bgilly 10-28-2013 08:49 AM

Now I need to find someone closer to do my FR warranty work. My selling dealer is over 60 miles away.

RoadTrip 10-28-2013 09:41 AM

Weird. First thing I thought of was that maybe you ran over a lion or cougar or something on your last trip and it was still stuck under there.

But that seems pretty unlikely…can you tell me more about what conditions the roar happened. In my mind, you're driving down the road and then "roar". And then you standing in a parking lot, engine off all closed up and wife closes her door and "roar".

Was it happening with the engine both on and off?

Have you checked the furnace? It will automatically cycle if left on. I found that out our last trip when it turned on in the garage one evening. Hadn't turned it off from the last trip...

jtrippy 10-28-2013 02:46 PM

Sound Under Carriage
I had my guy check the exhaust system etc. while the sound was happening. No luck. He said it may be a muffler baffle blown, (it does resemble that type of sound) but since it will do it when the engine is off, that is out.

It happens when you close the door or the other day while I had help with putting on the cover, the person on top was walking along and the vibration started.

Could it be the Firestone air springs making this blabbing vibration sound when the coach is shaken, the vibration starts and ends in about 10 or 15 seconds. When you are driving, it comes and goes with the coach going up and down with the road.

bgilly 10-28-2013 02:51 PM

I didn't understand the noise occurred when the engine is off. You got me stumped on this one.
I can't think of anything sounding like the furnace with everything off (refrigerator with an outside fan? )


jtrippy 10-28-2013 04:10 PM

Everything is off.

It is like you shake something that vibrates and you quit shaking, it stops. When you close the door, it vibrates the unit and then the vibration from whatever starts and quits in 10-30 seconds.

Do you think is may be the Firestone bladder letting off air or something?

paulmlac 10-28-2013 04:23 PM


Originally Posted by bclemens (Post 488995)
I'm guessing that is a FR fix since we handle all of the exhaust work. Heat shields is normally us too.

Oddly enough, I had just noticed what seems like a louder than normal exhaust sound too. Are you saying the exhaust system from engine to side exit is FR and not Ford? Seems like that would be Ford as part of the chassis.

bgilly 10-28-2013 05:49 PM


Originally Posted by jtrippy (Post 489306)
Everything is off.

Do you think is may be the Firestone bladder letting off air or something?

No, I don't believe it is your rear Ride-Rite air assist system unless you have an onboard air compressor that would be a pressure maintainer - but not likely.

Do you have auto leveling system? Maybe one of the hydraulic pumps are cycling from a short which reminds me of another reported noise a while back with the battery isolation monitor:


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