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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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