2015 hood flex help!!
- Thread starter greasy knuckles
- Start date
jrandom
New member
probos
New member
I had just had a glass of wine,......yeah,.......that's it.
Robert Morris
New member
Hood Flexing solved for $3
I too was having this very distracting flexing in the center of the hood at speeds of 70 or more, also In windy situations at lower speed. This made the truck appear cheap and generally poorly made. I was affraid it would ultimately crack the paint or worse.
I found after removing the black cover from the underside of the hood, that there was a gap between the sheet metal and the structural supports. If only those gaps were filled with something flexible yet light? I decided to solve the problem, here is how I did it.
First drop $3 on some Great Stuff foam sealant at your local hardware store. This is the insulating foam that you spray from a can and it expands, I used the Blue can because its supposed to be more flexible.
https://www.toyota-4runner.org/atta...6d1558386120-2015-hood-flex-help-img_4172-jpg
Next remove the black cover from the under side of the hood and place it black side down to cover the engine. You could also use a tarp, this stuff can get messy.
https://www.toyota-4runner.org/atta...7d1558386120-2015-hood-flex-help-img_4157-jpg
You can clearly see the gap between the sheet metal, I filled them "ALL OF THEM" once filled i allowed the foam to setup for around an hour.
https://www.toyota-4runner.org/atta...8d1558386120-2015-hood-flex-help-img_4160-jpg
The whole thing looked a bit messy, but it can be cleaned up with a little acetone (Fingernail Polish Remover) or, in my case, I just put the damn cover back on! Don't worry about any foam extruding from where the clips go. They will just snap on and all is good and right in the world now!
https://www.toyota-4runner.org/atta...9d1558386120-2015-hood-flex-help-img_4171-jpg
This resolved the issue, I have absolutely no bounce, flex or any such movement. I will update with further observations but I can say, whatever you can fill the gaps with, fixes the issue. Just to be sure, I tested at 100mph. ;-)
I too was having this very distracting flexing in the center of the hood at speeds of 70 or more, also In windy situations at lower speed. This made the truck appear cheap and generally poorly made. I was affraid it would ultimately crack the paint or worse.
I found after removing the black cover from the underside of the hood, that there was a gap between the sheet metal and the structural supports. If only those gaps were filled with something flexible yet light? I decided to solve the problem, here is how I did it.
First drop $3 on some Great Stuff foam sealant at your local hardware store. This is the insulating foam that you spray from a can and it expands, I used the Blue can because its supposed to be more flexible.
https://www.toyota-4runner.org/atta...6d1558386120-2015-hood-flex-help-img_4172-jpg
Next remove the black cover from the under side of the hood and place it black side down to cover the engine. You could also use a tarp, this stuff can get messy.
https://www.toyota-4runner.org/atta...7d1558386120-2015-hood-flex-help-img_4157-jpg
You can clearly see the gap between the sheet metal, I filled them "ALL OF THEM" once filled i allowed the foam to setup for around an hour.
https://www.toyota-4runner.org/atta...8d1558386120-2015-hood-flex-help-img_4160-jpg
The whole thing looked a bit messy, but it can be cleaned up with a little acetone (Fingernail Polish Remover) or, in my case, I just put the damn cover back on! Don't worry about any foam extruding from where the clips go. They will just snap on and all is good and right in the world now!
https://www.toyota-4runner.org/atta...9d1558386120-2015-hood-flex-help-img_4171-jpg
This resolved the issue, I have absolutely no bounce, flex or any such movement. I will update with further observations but I can say, whatever you can fill the gaps with, fixes the issue. Just to be sure, I tested at 100mph. ;-)
Attachments
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4RunnerRound
New member
That's a great idea. I have seen other car manufactures that put some kind of filler between the supports and sheet metal.
How hard was it to remove the black cover?
How hard was it to remove the black cover?
Whippersnapper02
Senior Member
I wonder how that foam will handle heat over time.
My Hood Flutter Is Fixed!
I had it on my 2018 Tacoma and I fixed it
I had it on my 2019 4Runner and I fixed it
This is what you need...Simply apply between the under Hood braces and it fixes it!
I used 2 tubes
Bought all this on Amazon
3M 04274 NVH Dampening Material - 200 ml
by 3M
5.0 out of 5 stars 4 customer reviews
Price: $47.83 & FREE Shipping. Details
You will need the caulk gun
COX M200LVMR 100 ml. x 100 ml. Cartridge Multi Ratio Low Viscosity Manual Epoxy Applicator
by COX
I had it on my 2018 Tacoma and I fixed it
I had it on my 2019 4Runner and I fixed it
This is what you need...Simply apply between the under Hood braces and it fixes it!
I used 2 tubes
Bought all this on Amazon
3M 04274 NVH Dampening Material - 200 ml
by 3M
5.0 out of 5 stars 4 customer reviews
Price: $47.83 & FREE Shipping. Details
You will need the caulk gun
COX M200LVMR 100 ml. x 100 ml. Cartridge Multi Ratio Low Viscosity Manual Epoxy Applicator
by COX
Robert Morris
New member
Update on $3 fix for hood Flexing
It Still kicks ass! Even when going through the automatic carwash. The air blower used to cause massive flex. Now, not one bit of flex! best $3 bucks I've ever spent!
It Still kicks ass! Even when going through the automatic carwash. The air blower used to cause massive flex. Now, not one bit of flex! best $3 bucks I've ever spent!
ElectroBoy
Banned
I understand the annoyance of driving at highway speed and seeing your hood flexing and buffeting in the wind.
So I went to my local HD store and got a tube of polyurethane sealant. I’ve used this type of material in housing caulking projects and love it. It takes a long time to cure but it sets up very tough and still slightly compressible. There must have been a dozen variations of the product among several manufacturers; I picked the Loctite PL Window Door and Siding Polyurethane Sealant in white.
I used a caulking gun to fill all the crevices under 1/4 inch or so. Then I cut some shims out of an old remnant of a foam backpack sleep pad; 3/8 inch closed cell foam, tough and slightly compressible. I jammed those into the larger gaps and backfilled around them with the caulk. I didn’t fill every gap under the hood, mostly the areas that seemed to provide good support toward the center of the hood. I left the hood up overnight to give the polyurethane some time to cure as it smells kind of strong as it’s outgassing. I actually let it sit all the next day since I didn’t need to drive so it cured even more. Then I reinstalled the fiber hood cover. I broke a few of the push clips when I removed them, so I had to buy some at the local auto parts store.
I haven’t given it the 80 mph test yet, but it seems to have dampened out the vibrations at 60-70 and on bumpy roads.
So I went to my local HD store and got a tube of polyurethane sealant. I’ve used this type of material in housing caulking projects and love it. It takes a long time to cure but it sets up very tough and still slightly compressible. There must have been a dozen variations of the product among several manufacturers; I picked the Loctite PL Window Door and Siding Polyurethane Sealant in white.
I used a caulking gun to fill all the crevices under 1/4 inch or so. Then I cut some shims out of an old remnant of a foam backpack sleep pad; 3/8 inch closed cell foam, tough and slightly compressible. I jammed those into the larger gaps and backfilled around them with the caulk. I didn’t fill every gap under the hood, mostly the areas that seemed to provide good support toward the center of the hood. I left the hood up overnight to give the polyurethane some time to cure as it smells kind of strong as it’s outgassing. I actually let it sit all the next day since I didn’t need to drive so it cured even more. Then I reinstalled the fiber hood cover. I broke a few of the push clips when I removed them, so I had to buy some at the local auto parts store.
I haven’t given it the 80 mph test yet, but it seems to have dampened out the vibrations at 60-70 and on bumpy roads.
Attachments
DallasTRDPro
Member
I'm gonna have to try this. I just got my 2020 and its annoying as hell. I have had multiple Jeeps so I know what hood flutter is and that can be dangerous but easily fixed. The hood flexing on my 4R is just annoying so a $3 fix would be ideal.
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DallasTRDPro
Member
Well I decided to see if I could fix this hood vibration. Having a Magnetic Gray I think it was more pronounced than say white or silver. I started with some Dynamat type material that I had left over from my last Jeep. I took it for a test drive and it made about 25% difference. Then I decided to go to Home Depot and buy some Great Stuff. Filled any place I thought I could. Took it for a test drive and it probably helped another 10%, but it hadn't set yet. Then I decided to adjust the rubber hood stops on the front of the hood and then drove to work. Now I don't know or care if the Great Stuff finally having a couple of hours to set or adjusting hood stops made the most difference, but around town and over bumps I would say 90% is gone. I will take it on the highway tomorrow to see how much it helped on the highway. So far around town and over bumps, I'm really glad I did this. Definitely not the cleanest job to work with the Great Stuff.I will post tomorrow once I see how it does on the highway. Even if its not totally gone, I'm still satisfied and its definitely not something someone will notice like before.
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