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Hello

Maybe you guys can help me out on this. Whenever I put my 2004 Civic sedan on idle for about 5 minutes a muted, vibrating sound starts coming from the back. It sounds like two pieces of plastic vibrating against each other. I've already made sure that the split-folding seats are securely shut as well as the plastic covers for the child seat anchors. The rattling also happens when I'm rolling slowly during rush hour. Any ideas on what it could be? Thanks

 
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Could it be that plastic thing covering the rear speakers? try stuffing a towel between the plastic and the rear window. Or something that will put preasure on that plastic near the window.

 
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Yeah its that rear deck mine has always done it ....i just never pay any attention to it

 
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It's damn annoying. I also hear when I shut the driver's door from the inside. I've noticed also that the rattles come out when the engine is reving around 900-1200rpm, or during the "warming up" idle.

I've looked inside the trunk and all over to the back to see what might be causing it, and still no clue.

 
Rep Power: 812

It's the stupid rear deck. The part that's closest to the brake light. I put foam and stuff in there, but it still does that in the winter. Find some thicker foam and just shove it back there.