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Does it only do it when your idling? I know with the tc's the cai piping would rattle against the hole the piping went through when at an idle in D or R. Don't know how they mount in an xB but I suppose it's worth a look.

 

this sounds like it is definatly your cold air intake. you just have to adjust it so in is not sitting that close to anything. i had the same problem

 

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I think I know where your rattle is coming from. Everything that you stated applies to me. I also have the TRD intake, and thought that it was the problem.

Check your fuse box in your engine compartment. I was sitting at an idle in drive, with my foot on the brake, and sure enough the rattle started. Open you hood while this rattle is going on, have someone put their hand on the fuse box, and you will notice that the rattle will go away when they do that.

The rubber connector for our intakes barely comes in contact with the fuse box at a low idle, thus causing the rattling.

Hope this helps,

Slugo

 

I remember a friend who had a TRD CAI on their xB2 and it was installed in a way that the negative battery terminal was very close to the intake and caused rattles upon acceleration. So, check that?

 

It could also be the latch for the hood. Under the hood you will see rubber stoppers that twist in and out to adjust their height. They may not be extended enough to keep the hood from moving so check those as well.

 

This is what it probably is, it sounds like you have the same problem as me. When Im in drive it rattles from the engine bay, when im in neutral it doesnt do it. I adjusted these runner stoppers and fixed the problem. You may want to try and do this...

 

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If you get the rattle sound when the hood is open, then it's NOT the hood bump stops.

 

could be a exhaust leak. tighten everything that was involved with the CAI.

 

Its the where the header meets the down pipe. I have the same problem.

Ahhh welcome to aftermarket

 

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Double nut all of your flanges.

 

i have this problem every other day. different aftermarket parts scrambled amongst the engine bay with eventually rattle. and the amount of crap crammed under my hood leaves lots of room for ping and pangs. you just have to find out exactly where its comming from. do you have HID's?? cause the box can cause rattling. CAI pipes against the frame. what pasquale said about the header. and many other little things. you could have left a tool or a bolt under there. the possibilities are endless, and i hate when that happens! but just keep looking yourself. you'll find it. and when you find it, either wrap it in heat wrap, or reposition it to kill the noise!

 

This is one of those problems that needs hands-on trouble-shooting. Bring your car to me and I'll have a look, otherwise I won't even hazard a guess. Too many possibilities.

Recently my mom thought her Highlander needed a new transmission because it makes a "shrieking sound" when placed in drive or reverse when cold. It turned out to be nothing more than a noisy A/C compressor clutch. Check everything.

 

Check to see if the s-pipe is hitting the frame. The Strup header is longer than the oem and places the s-pipe closer to the frame cross member.

 

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Check your gas cap and make sure it is screwed on all the way. My dad put some gas in my xB a few months ago, forgot to tighten the cap all the way until it clicked, and the same thing happened to me. After I tightened my gas cap, the warning lights on the dash went away after a few miles of driving. I hope this turns out to be the issue and an easy fix for you.

Good luck,

Slugo