Godzilla motor in my MH going up heavy grade making strange noise
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7th Gear
Joined: Sep 2016
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Godzilla motor in my MH going up heavy grade making strange noise
https://youtube.com/shorts/WFWfG7Xnt1s?si=ZqXsTbTMb3AsPFGV
Time stamp 12 seconds in you will hear a hissing sound and it won’t go away till I’m going downhill for a while. This is the 3rd time I’ve heard this sound and managed to video it as I anticipated it would happen again on this same grade. Motorhome is at Ford dealership in Arizona under the bumper to bumper warranty as it’s 3 years new September 2, 2024.
it has never made this sound before on these same grades and some other heavy grades I have gone up.
this video I didn’t have the tow vehicle hooked up so it was a lighter load. Vehicle didn’t deliver any fault codes. I would like to pass along your thoughts to service as they are currently trying to resolve this issue. I posted this on a MH forum too. It sounds like one other currently has this same issue unresolved.
thanks for your anticipated feedback.
hopefully forum will let me link the YouTube video I made.
video link is in first comment.
Time stamp 12 seconds in you will hear a hissing sound and it won’t go away till I’m going downhill for a while. This is the 3rd time I’ve heard this sound and managed to video it as I anticipated it would happen again on this same grade. Motorhome is at Ford dealership in Arizona under the bumper to bumper warranty as it’s 3 years new September 2, 2024.
it has never made this sound before on these same grades and some other heavy grades I have gone up.
this video I didn’t have the tow vehicle hooked up so it was a lighter load. Vehicle didn’t deliver any fault codes. I would like to pass along your thoughts to service as they are currently trying to resolve this issue. I posted this on a MH forum too. It sounds like one other currently has this same issue unresolved.
thanks for your anticipated feedback.
hopefully forum will let me link the YouTube video I made.
video link is in first comment.
Last edited by Jgkopp; Jul 16, 2024 at 02:59 PM.
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7th Gear
Joined: Sep 2016
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That’s the first thing I suspected and dealership manually ran the fan clutch through all its stages and didn’t find anything wrong with it. I then picked it up and performed the test drive I made video on to more or less document this event. It happened two more times as I was going up grades on the way back to dealership. It also lost a little power right when this noise started.
Mountain Pass
Joined: Feb 2024
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I can't tell for sure based on this video, but I'm assuming the sound is getting louder as you step on the accelerator, and gets quieter as you back off? My guess is that you drove through a dust storm one time and clogged your air filter (it's happened to me). Or maybe your air filter got soaked and ruined it. Something like that is happening, anyway, and it's pulling air from around the filter, through a leak in an intake hose, or a leak in the throttle body.
Lead Driver
Joined: Jan 2002
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From: Itinerant
I would check all air plumbing first myself. Retighten all clamps, bolts and purchase new filter.
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It sounds like the clutch fan engaging do to heat under load, when it engages you can feel the lose in power because the power it takes to turn the fan over. It's doing what's it's supposed to do.
Denny
Denny
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Your probably right, but my '98 E40D made a similar sound when the transmission got hot, and this mystery sound did seem to change when either the OP let off the gas or gear shift occurred.
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