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Old 05-17-2022, 10:13 PM   #1
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noise drivers side under dash board

i have a noise, that sounded like a speedometer cable.
starts about 55 mph and goes to about 62 mph, but.......

wind gusts while driving causes it to make noise while driving, sometimes as low as 45 mph . i thought at first it was a speedometer cable that needed lube, but now i am sure its something flapping.
sound is comming from under board area drivers side.

any ideas?
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Old 05-18-2022, 03:52 AM   #2
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Originally Posted by fenderworks View Post
i have a noise, that sounded like a speedometer cable.
starts about 55 mph and goes to about 62 mph, but.......

wind gusts while driving causes it to make noise while driving, sometimes as low as 45 mph . i thought at first it was a speedometer cable that needed lube, but now i am sure its something flapping.
sound is comming from under board area drivers side.

any ideas?
It could be a piece of rubber used to control the airflow on the underside of the engine, up by the radiator. Have you had any work done on the RV lately? Perhaps it wasn't put back into place completely.

Can you get someone to pace you at speed to look for something flapping under the rig?

I often have some vinyl insert come partially out of its trim channel. It doesn't look wrong sitting still, but when we get up to speed it starts flapping around.
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Old 05-18-2022, 04:38 PM   #3
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scoutmaster,

thanks for the reply. no work done recently.
yes, i have checked plastics and rubber, anything that is loose.
everything looks ok.....i just have not found it yet.

i will track it down or turn up the radio.
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Old 05-19-2022, 08:21 AM   #4
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I will assume this is a Ford V10. One common noise the V10 makes is a "flutter" noise from the serpentine belt. Drivers side front of engine. Belt vibrates under acceleration in the speed range you mentioned. The cure (if this is your problem) is an aftermarket replacement belt. There are threads on this and other sites about it. Hope this is of help. My 2019 Greyhawk does this and I have learned to ignore it. Sounds like engine preignition to me but it does make noise relative to engine load and speed.
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Old 05-19-2022, 08:42 AM   #5
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I will assume this is a Ford V10. One common noise the V10 makes is a "flutter" noise from the serpentine belt. Drivers side front of engine. Belt vibrates under acceleration in the speed range you mentioned. The cure (if this is your problem) is an aftermarket replacement belt. There are threads on this and other sites about it. Hope this is of help. My 2019 Greyhawk does this and I have learned to ignore it. Sounds like engine preignition to me but it does make noise relative to engine load and speed.
This noise can be fixed by adding another idler pulley on the drivers side of the engine if you don’t have one to keep the belt tight. Easy cheap fix
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Old 05-20-2022, 04:33 AM   #6
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Here is the thread mentioned above: "e-450 engine rattle - serpentine belt". Adding the idler is super easy, inexpensive, and fullproof.

https://www.jaycoowners.com/forums/f...elt-82252.html
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Old 05-20-2022, 06:55 AM   #7
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Just replaced belt with only 18,000 miles on it. Checked and belt had stretched. Put a high quality belt on it.
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Old 05-20-2022, 04:50 PM   #8
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i read the section on "belt flutter".
this could be it, i will have to investigate next time out.

but, it really sounds like something is "flapping in the wind".
it seems to be a speed thing, not a rpm thing.

but again, more investigating is needed.
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Old 04-26-2023, 08:28 PM   #9
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Well.......I still have the "flapping" noise. Added the extra idler pulley. But still have the noise. It seems to happen more when it's windy and sideways wind. It's an odd one for sure. Also have duct taped anything that could flap, nothing working yet. I will figure this thing out...someday!
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Old 04-26-2023, 08:37 PM   #10
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Do not know what type of fresh air vent these things have on them but is it possible the out side air being forced through the vent may be flapping the vent that shuts the outside air off.
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Old 04-27-2023, 05:11 AM   #11
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I smiled when you mentioned it could be a speedometer cable...my 67 Camaro made a ruckus because of the speedo cable.

However, our modern vehicles today no longer use cables. They are all electronic now with speed sensors used as a trigger to operate an electronic type speedometer.

Unless you have a very old RV.

Hope you are successful in locating the noise. I know these things drive me nuts. My wife just tells me to turn up the radio. That doesn't help me!
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Old 05-08-2023, 08:21 PM   #12
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EUREKA!!!!!!!!!!!
I have finally found the problem. only 4000 miles later.
its amazing how much time it has taken me.

anyway,
drivers side front windshield rubber molding on the outside. the molding was loose and not pushed into the groove. pushed into the windshield groove and all is now good.

it sure did not sound like it was coming from that area.

WHEW!
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Old 05-09-2023, 11:13 AM   #13
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Congratulations!!

Now you can turn the radio down again.
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Old 05-09-2023, 04:09 PM   #14
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huh? what? oh ya, turn the radio down
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