Did I warp my hood trying to fix flutter? - Chevy Colorado & GMC Canyon
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post #1 of 20 (permalink) Old 05-23-2017, 10:24 PM Thread Starter
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Did I warp my hood trying to fix flutter?

So I got rid of the hood flutter on my '17 Canyon by injecting Great Stuff foam into it, but it looks like my hood now has some waving in the area where I applied the foam. I don't know if this wave was already there or if I caused it. They look even on both sides, so I'm not sure. I tried to capture it with my camera, but I had some trouble due to the black reflecting. Thoughts? If you have the same hood would you check to see if you have some undulating or slight wave toward the back of the hood near the windshield?









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post #2 of 20 (permalink) Old 05-23-2017, 10:54 PM
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It does not look normal to me, but I have a Colorado.....but still, under that light it looks a little warped.

How does it look outside though? Might just be the angles and the lighting you are using.

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post #3 of 20 (permalink) Old 05-23-2017, 11:06 PM Thread Starter
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Originally Posted by Toughsox View Post
It does not look normal to me, but I have a Colorado.....but still, under that light it looks a little warped.

How does it look outside though? Might just be the angles and the lighting you are using.


Yes, it looks a little warped when I look at it at certain angles, but it looks exactly the same on both sides. It also doesn't look like an abrupt hump or blob, which is why I'm unsure.


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post #4 of 20 (permalink) Old 05-23-2017, 11:13 PM
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I wouldnt use expandable foam inside a hood
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post #5 of 20 (permalink) Old 05-23-2017, 11:14 PM
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Great Stuff foam expands several times the amount that is applied. It is also going to dry under high heat to the point of turning into a powder. I am by no means and expert, but I would try to remove as much as I could
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post #6 of 20 (permalink) Old 05-23-2017, 11:27 PM
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Foam is ok as GM recommends it for professional repairs.

Any a I mean any adjustments should be fine eith care if you have little experience.

Trust me I learned this the hard way myself.
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post #7 of 20 (permalink) Old 05-23-2017, 11:27 PM
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I would be worried it would expands too much as it sounds like yours may have, also if you ever get a ding or any damage too it. It is going to make it very hard for a bodyshop to work with it
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post #8 of 20 (permalink) Old 05-23-2017, 11:27 PM
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Where did you apply it?

The tsb is specific on where it needs to be filled with Kent® Ure-Foam Expandable Foam Sound Deadener

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post #9 of 20 (permalink) Old 05-23-2017, 11:29 PM Thread Starter
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I found some pictures I took from when I first bought the truck. Looks like the warping wasn't there.
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post #10 of 20 (permalink) Old 05-23-2017, 11:40 PM Thread Starter
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Where did you apply it?

The tsb is specific on where it needs to be filled with Kent® Ure-Foam Expandable Foam Sound Deadener
Yes, I referenced the TSB, and applied it into the second hole from the outside in.
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post #11 of 20 (permalink) Old 05-23-2017, 11:51 PM
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Originally Posted by Hercules View Post
Yes, I referenced the TSB, and applied it into the second hole from the outside in.
You said you used Great Stuff, not Kent. That is the part that concerns me. I put great stuff in a wall once, and it pushed the drywall off the studs.

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post #12 of 20 (permalink) Old 05-23-2017, 11:59 PM
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What type of great stuff did you use
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post #13 of 20 (permalink) Old 05-24-2017, 12:04 AM Thread Starter
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What type of great stuff did you use






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post #14 of 20 (permalink) Old 05-24-2017, 12:32 AM
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What does the hood look like on engine side where the warping occured? Im guessing the foam made its way into a tight channel between the hood and expanded pushing the metal apart. And due to the channel being the same on both side thats why you experience identical warping on both sides
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post #15 of 20 (permalink) Old 05-24-2017, 08:22 AM
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May be we should call this Not So Great Stuff.


I wager the non Kent material just expended and harder than the recommended Kent Moore material. Most sound deadening is more a rubberized like material that is a coating where this stuff here is to fill gaps in buildings.


Odds are it did change the shape of the hood as it is hard to tell in the photos but my GMC has no dimple there.


Odds of removing the material are poor too as that stuff is a mess when you get it where you don't want it and can't cut it away.
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post #16 of 20 (permalink) Old 05-24-2017, 08:52 AM
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Originally Posted by Hercules View Post
I found some pictures I took from when I first bought the truck. Looks like the warping wasn't there.
I do not have any warping on my Colorado hood either. Also, do not notice any flutter so far on my 2017.

I do know that the hood metal is easily deflected and not as stiff as years back. I just applied the AVS Aeroskin hood protector which adheres with 3M tape. I was surprised how easily even the front edge of the hood and corners can deflect with moderate to firm pressure.

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post #17 of 20 (permalink) Old 05-24-2017, 09:09 AM
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I wouldn't be using regular Great Stuff, but GREAT STUFF Window and Door which has minimal expansion...even so there is a dealer TBS out on this, probably better to have them deal with it so if they mess it up they cover it.
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post #18 of 20 (permalink) Old 05-24-2017, 09:33 AM
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Curious if you tried to adjust the hood prior to the foam fix. My '17 Colorado had a fairly aggressive flutter and I lowered the center latch around 1/8"~1/4" and raised the outer 4 bump stops and it eliminated all (90% +) of the flutter.

I was pretty surprised at the results, as it was amazing how that simple adjustment did the trick.

Foam would have been my next option, but it's a non issue now.
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post #19 of 20 (permalink) Old 05-24-2017, 09:35 AM
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Quote:
Originally Posted by Hercules View Post
So I got rid of the hood flutter on my '17 Canyon by injecting Great Stuff foam into it,

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post #20 of 20 (permalink) Old 05-24-2017, 10:18 AM Thread Starter
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Originally Posted by jburbs22 View Post
What does the hood look like on engine side where the warping occured? Im guessing the foam made its way into a tight channel between the hood and expanded pushing the metal apart. And due to the channel being the same on both side thats why you experience identical warping on both sides
It's covered up now with the heat shield. But that sounds like a possibility. I'll need to check later.

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Originally Posted by hyperv6 View Post
May be we should call this Not So Great Stuff.
Ha! I had read some folks using it for this purpose with success. If anything, hope this serves as a caution for others.



Quote:
Originally Posted by sohccammer427 View Post
Curious if you tried to adjust the hood prior to the foam fix. My '17 Colorado had a fairly aggressive flutter and I lowered the center latch around 1/8"~1/4" and raised the outer 4 bump stops and it eliminated all (90% +) of the flutter.

I was pretty surprised at the results, as it was amazing how that simple adjustment did the trick.

Foam would have been my next option, but it's a non issue now.
I did try the adjust as per the guidance that's out there but it didn't fix the flutter, so I proceeded with the foam.

Thanks everyone for all your feedback on this and confirming what I thought happened. I'll just learn to live with it. I'm thinking of considering it my new mod as it looks like my hood has some fangs to it. Maybe I'll go for a wolf theme


Last edited by Hercules; 05-24-2017 at 10:20 AM.
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