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Open Roads Forum  >  Class C Motorhomes  >  Class C

 > Trying to diagnose a loud rattle coming from the floorboard

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klutchdust

Orange, California

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Joined: 06/09/2004

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Posted: 10/19/21 09:47am Link  |  Quote  |  Print  |  Notify Moderator

All of my delayed rattles have been exhaust related. My Jeep, motorhome and diesel pickup. Inspect very closely, there is metal touching metal somewhere. My GMC it was the bracket that holds the exhaust as it leaves the manifold, my jeep a crossover bracket connected to the cat and my "C" a exhaust shield bracket under the shield and difficult to see.

I found my rattle on my C by driving home after smog inspection with the dog house off, kind of tough to do and only a few miles but the rattle noise with and without the dog house sounds like two totally different areas.
To check your motor mount, raise hood, apply parking brake and gently accelerate and see if the engine tilts or lifts. You can have someone watch from a safe distance or record with your phone. Hold foot brake as well, just a touch on the accelerator will do it.

* This post was edited 10/20/21 09:30am by klutchdust *

gidyupgo

MidWest Georgia

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Joined: 02/24/2021

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Posted: 11/01/21 06:53am Link  |  Quote  |  Print  |  Notify Moderator

pnichols wrote:

I wonder it it's the infamous E350/E450 serpentine belt "rattle"?

This has been discussed a lot in the Ford owners forums. I believe the solution has something to do with an additional, or different, idler pulley between installed at a certain place in the belt's path so as to better support the belt at certain engine speeds.


If your "rattle" is from the pulley referenced above,it occurs at ~ 2100 rpm only. This is due to belt vibration at that RPM. A new belt will stop the noise (sounds like ignition ping) for a few thousand miles, but it comes back.

Here is a link if you want to read more.

https://www.jaycoowners.com/forums/f5/e-........le-serpentine-belt-82252.html#post921181


Gary
Midwest Georgia, 2017 Sunseeker 3010DS, GMC Acadia AWD TOAD

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