besides everything else , I've installed to my car an ALPINE SWX-1242D 12"
driven by MA AUDIO HK2000D amp , I also have used dynamat to the whole trunk
I still have vibrations and they seem to come from the rear bumber , any ideas how to eliminate those ?

 

What you have is "rattles" something rattling against something else, it is a difficult thing to get rid of and is an ongoing process, what you have to do is simple, doing it is the hard part, once you find what is rattling up against what, all you do is place something soft between them, sounds easy but can be a lot of work.
EG: you think it's from the rear bumper, so you would start by removing the bumper clip, [cover] maybe all it is is some stones have worked themselves up into the actual bumper. 94

 

there's an outlet on the rear outer quarter panel. basically it's a vent with a flap of rubber covering it. sometimes it's a bunch of air escaping from here.

http://www.barancoacuraparts.c...7C023

see the hole below the gas door? it's covered by the back bumper. you might want to remove the bumper to see if it's that. if it is, cover it up and add dynamat or whatever to other metal panels that may be resonating.

 

Ventilation vent, not sure you want to cover that up its there to remove condensation from behind trim paneling, but it is one of the things that buzz and rattle in your car, but its only because of the way it's mounted, the rubber flaps don't rattle, remount vent with a bead of sic one all the way around, rattle/buzz gone. I have even drilled holes and pop-riveted it into place along with silicone. IMO it should be left in place, Honda put it there for a reason. 94

 

there will always be vibrations.. but i think ur bumpers loose? lights? could be anything... use dynamat... and check your rear trunk for any loose bolts..

when its too loud it coudl loosen bolts

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fcm &raquo;</TD></TR><TR><TD CLASS="quote"> Ventilation vent, not sure you want to cover that up its there to remove condensation from behind trim paneling, but it is one of the things that buzz and rattle in your car, but its only because of the way it's mounted, the rubber flaps don't rattle, remount vent with a bead of sic one all the way around, rattle/buzz gone. I have even drilled holes and pop-riveted it into place along with silicone. IMO it should be left in place, Honda put it there for a reason. 94</TD></TR></TABLE>

I figured out what that vent was for. it serves to jobs. Tho keep a little air in the car for fumes. And to help you close your doors. I covered it up whe I did my sound system. You have to slam the doors because the air pressure in the car has to go somewhere.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wrx-killer-Sti eater &raquo;</TD></TR><TR><TD CLASS="quote">

I figured out what that vent was for. it serves to jobs. Tho keep a little air in the car for fumes. And to help you close your doors. I covered it up whe I did my sound system. You have to slam the doors because the air pressure in the car has to go somewhere. </TD></TR></TABLE> Makes sense to me. 94

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fcm &raquo;</TD></TR><TR><TD CLASS="quote">What you have is "rattles" something rattling against something else, it is a difficult thing to get rid of and is an ongoing process, what you have to do is simple, doing it is the hard part, once you find what is rattling up against what, all you do is place something soft between them, sounds easy but can be a lot of work.
EG: you think it's from the rear bumper, so you would start by removing the bumper clip, [cover] maybe all it is is some stones have worked themselves up into the actual bumper. 94</TD></TR></TABLE>

first off all , really thank you guys , i didn't expect so many replies

it's not rocks , that's for sure , neither the vent you're talking about.
the back door (hatch) seems to be fallen a bit back , and the bumber, (a bit of metal between the bumber and the tail lights) , and the taillights seem to come apart .
i ll try to post some images if that would help . the connection point which used to look like a line , it's now a huge gap.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by luckyzz &raquo;</TD></TR><TR><TD CLASS="quote">

first off all , really thank you guys , i didn't expect so many replies

it's not rocks , that's for sure , neither the vent you're talking about.
the back door (hatch) seems to be fallen a bit back , and the bumper, (a bit of metal between the bumper and the tail lights) , and the taillights seem to come apart .
i ll try to post some images if that would help . the connection point which used to look like a line , it's now a huge gap.</TD></TR></TABLE> Yes both the tail lights and the metal trim, [between bumper and hatch edge] are removable, [along with bumper clip and the actual bumper under the clip] and can work loose.

Take it all apart, and using Dynamat, [or the like] spray expanding foam, rubber gaskets, [made from old inner tube] closed cell weather stripping, remount it all, making sure everything is nice and tight. 94

 

are there any how-tos on the internet how to remove them ? I tried today but it seems that i'm missing something , i also googled it and i came up with nothing really usefull

 

First remove rear inside trim, tail lights are held in with nuts [4 or 5] spun onto studs, once the nuts are removed the light assembly can be pushed out using the studs, [leave a nut on two of the studs at the top of stud] so when the assembly "pops" lose it doesn't fall to the ground and get damaged.

The trim piece bolts are behind the trim along with the bumper clips upper mounts, there are also screws and plastic clips along outside lower edge.
It all comes apart very easily, other then the tail light assemblies, [that "stick"] the trim and clip will come off easily when bolts and plastic clips are removed. 94