Noise from behind the dash, rattle at specific rpm

[BestCarEver]

I was driving across a 10 lane fast bridge when I heard a noise from something getting hit underneath. I figured the car should easily take that kind of hit, I did not worry.

Then I noticed that at a certain RPM, I would get this cheap rattle sound behind the dash. Being a new car, I was at the dealer, like as soon as I could replicate it.

They took the dash out, had a look, checked everything out, nothing. I took the tech for a drive, replicated it and he found it.

That thin aluminum plate under the engine deformed and at a certain speed set up some kind of resonance that came up through the firewall, sounding like it was from the dash.

They bent it back the best they could, but it still made the rattle, so I used some Gorrilla Tape, and it is as it was new. I bought the new bits, will get them on when the weather is pleasant.

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[NMRod]

I get something similar around 2700 rpm, havent found the scource, maybe ill look under the car

 

[BestCarEver]

I was driving across a 10 lane fast bridge when I heard a noise from something getting hit underneath. I figured the car should easily take that kind of hit, I did not worry.

Then I noticed that at a certain RPM, I would get this cheap rattle sound behind the dash. Being a new car, I was at the dealer, like as soon as I could replicate it.

They took the dash out, had a look, checked everything out, nothing. I took the tech for a drive, replicated it and he found it.

That thin aluminum plate under the engine deformed and at a certain speed set up some kind of resonance that came up through the firewall, sounding like it was from the dash.

They bent it back the best they could, but it still made the rattle, so I used some Gorrilla Tape, and it is as it was new. I bought the new bits, will get them on when the weather is pleasant.

I get something similar around 2700 rpm, havent found the scource, maybe ill look under the car

Hope it works..

 

[splat]

What RPM? I get a resonance from what sounds like the front right of the engine bay at 2100-2200 RPM. I didn't think to check the underbody trays.

 

[NMRod]

Thats about the rpm mine is at and only when accelerating or clutching around there

 

[BestCarEver]

I am getting an oil change this morning and I will ask them to put back a new cover I bought a while ago. I get the sound more reliably from wind underneath the car about 70km/hr. I will take a test drive after and follow up, hopefully with some pictures..

 

[BestCarEver]

I am getting an oil change this morning and I will ask them to put back a new cover I bought a while ago. I get the sound more reliably from wind underneath the car about 70km/hr. I will take a test drive after and follow up, hopefully with some pictures..

The weird noise is now gone... I am going to straighten this one out as best I can on a flat surface. Gonna take my time to get it perfect, because the air gets underneath it at rattles it like the skin on a drum. Almost thinking some weather stripping would take this repair up to 11...

 

[BestCarEver]

The weird noise is now gone... I am going to straighten this one out as best I can on a flat surface. Gonna take my time to get it perfect, because the air gets underneath it at rattles it like the skin on a drum. Almost thinking some weather stripping would take this repair up to 11...

The part is called Engine Cover Lower... It is a really cheap part less then $16... My dealership sold me the entire bottom plastic surround as well for over $115... Geez, that stings.. Just buy one of these puppies and swap it out next oil change and see if the miracle occurs...

https://www.hondapartsnow.com/genuine/honda~plate~fr~engine~cover~lower~74114-tr0-a00.html

 

[Rickmeister 48]

If you guys go to the dealer for oil changes, check this thing every time. The dealer put mine on half assed and caused it to bend all up as they put it over the clips instead of sliding it onto them.

 

[a c i d.f l y]

I've got a slight buzzing occasionally around the 2-2.5k rpm range. Sounds like it's directly behind the head unit. I'm guessing it's a resonance issue since it only started happening after I installed my aftermarket intake. Could probably just be the one plastic clip I lost in the engine compartment abyss. Not enough to really bother me ultimately, but being attuned to every little detail it does drive me a little batty sometimes when I'm driving in quiet mode (no tunes, at night on a long calm strip of highway).

 

[BestCarEver]

I've got a slight buzzing occasionally around the 2-2.5k rpm range. Sounds like it's directly behind the head unit. I'm guessing it's a resonance issue since it only started happening after I installed my aftermarket intake. Could probably just be the one plastic clip I lost in the engine compartment abyss. Not enough to really bother me ultimately, but being attuned to every little detail it does drive me a little batty sometimes when I'm driving in quiet mode (no tunes, at night on a long calm strip of highway).

I am thinking of using some durable weather stripping to reduce vibration. Hope you find the clip... happy hunting!

 

[Rickmeister 48]

The part is called Engine Cover Lower... It is a really cheap part less then $16... My dealership sold me the entire bottom plastic surround as well for over $115... Geez, that stings.. Just buy one of these puppies and swap it out next oil change and see if the miracle occurs...

https://www.hondapartsnow.com/genuine/honda~plate~fr~engine~cover~lower~74114-tr0-a00.html

That part says it only fits up to a 2015 civic, mine is a 2017 and you have to buy more than just the metal piece and its 106.00 part # 9 ...
https://www.hondapartsnow.com/parts-list/2017-honda-civic-2dr-ex-turbo-cvt-ka-cvt/under-cover.html

 

[BestCarEver]

Crazy... I paid $115 for the whole thing, what a waste. Maybe in a while it will be available. This part is removed when the oil is changed, as such I see no reason to bundle it. Anyhow... The part number on the stamping is 74114 TBA. I would take it off, straighten it out, put some weather stripping on it to compensate for irregular shape... and back she goes...

 

[chinchilla978]

Hi all,

Just out of curiosity, did the rattling sound like this? I recently purchased a certified used 2019 Civic Coupe Sport 2.0L and I've been having this noise occur around 2k-3k rpm. It's been to two different dealerships who ruled out anything engine related, but they can't seem to pinpoint where this metal rattle is coming from. I looked under the car and saw that my engine cover looked a bit similar to OP's. Anybody know what this noise could be? It's driving me insane. Any suggestions are appreciated!! (You can hear it clearly around the 15-18 second mark...)