I have a 2000 civic hatch with a 2000 GSR motor. Ever since I got the car, I have had a metal buzz/rattle sound coming from the shifter/cat area under the following conditions:

* the car is in 4th or 5th gear
* RPM's are above 3,000
* my foot is OFF the gas (decelerating)
* noise stops as soon as I get back on the gas or take it out of gear

Since getting the car I had replaced the exhaust, mounts, linkage, tranny and intermediate shaft, and the noise has not gone away. The only thing that has not yet been replaced is the cat.

Any ideas/suggestions are appreciated - I really don't know what else it could be so any ideas would help.

TIA

 

Check the heat shield, the bolts might be loose.

 

Ok let me clarify this - there are no heat shields anywhere, and I have spent hours pounding the undercarriage of the car looking for any kind of a noise. Everything is solid, but the noise is still there, which leads me to believe it may be somewhere internal. Any other ideas?

 

Up for this problem since im experiencing the same thing. I personally think its something internal (but im hoping im wrong)...when i hold my shifter when its vibrating it feels like a rotating type of vibration (dont ask me how to describe it any further... )

It started happening after I ran R-compounds after an atuox and never stoppped since.

Much of my vibration occurs around 3k-3.5k and doesnt stop. (unless i hold the shifter pretty good)

 

It is driving me crazy and what's worse is that no one seems to know what else it could be, and the sound happens at too high of speed to be able to diagnose it effectively. I am getting a different cat to try either today or tomorrow, but I really doubt that the cat is the problem.

 

Up... someone has to know this!

 

Do you have a resonator on the car?

When my car did it I could just rev it and let off and you would hear it. I put a 12" resonator in the exhaust and the noise went bye bye.

 

Yes, I do have the resonator.

My exhaust setup is as follows:

USDM ITR header -> GSR cat -> Mugen twinloop b-pipe (with resonator) and the Mugen twinloop muffler.

 

The only other thing I can think of is if you have a differrence in pipe size.

From the Header collector 2.5" to 2.25" cat, or 2.5" cat to 2.25 exhaust.

When I had mine done the dumbass put a piece of pipe that went from the 2.5 to 2.25 and I had the buzz. This is before I had the res. put on.

Do you have anything like that?

If not then is the shifter rubbing on the exhaust? I know that I had to cut off the end of the shifter linkage so it would not hit on mine when I installed a short shifter.

There isn't much else down there... See if anything is close to rubbing.

 

I am buying an ITR cat from a guy tomorrow hopefully, and that will eliminate the only width difference there currently is. The ITR cat should be 2.5 in size, so it should line up perfectly between the ITR header and the MTL exhaust (both 2.5").

The linkage is definitely not rubbing and I have spent countless hours under the car looking for anything that's rubbing. Hopefully replacing the cat will resolve this - I think everything else down there has already been replaced.

 

I also have a question - the buzzing sound that YOU had, did it happen under the same circumstances as I described in my original post?

 

No, Not in 4th and 5th, My noise all I had to do is rev it and let off the gas It would sound like Wuuuuuuummmmm Phaaggrrrrrrrrrrrr The phggrr is when it would make the noise, when I let off the gas. It sounded like it was from the collector on the header. It kind of sounds like an aluminum can got stuck in the exhaust.

But like I said it was the POS job the exhaust guy did with the adapter fron 2.5 down to 2.25.

 

Well, I checked the header and exhaust and none of them make any sound (I spent about an hour with a rubber mallot underneath the car pounding away at everything trying to get something to make noise) - still nothing, but the sound is still very much there when I am driving. I can't be the only one with this problem!!