Rattiling problem ... heat shield?

x46359 · Post by **x46359** » October 13th, 2007, 12:42 pm

Wondering if anyone could help me out with this problem...

Lately my 98 itr has this really loud rattle/grinding noise when the rpm hovers right around 1700-1800 (everywhere else is fine). Just to clarify on the sound ... to me it seems like something is loose and it's rattling/vibrating to make that noise. At first I thought it was the transmission but I've had zero problem's so far and it's ONLY between 1700-1800rpm's.

The shop I took it to told me that it was the heat shield vibrating. I had this sound before and took off the cat heat shield ... sounds disappeared for about a month and now its back. So I'm thinking that the shop might be right.

Are there any issues with taking off the header "heat shield" ie parts melting/being destroyed?

Thanks in advance for the help.

Rich

Jackson · Post by **Jackson** » October 13th, 2007, 9:45 pm

My guess is your o2 sensor is loose on either your cat or header. Those usually rattle loose before a heatshield would.

ITR010342 · Post by **ITR010342** » October 16th, 2007, 8:13 am

Got the same problem! Mine vibrates around 2500-3000 rpms. It must cause a vibration at different frequencies on different cars. its really annoying, but I am sure its the cat heat shield. just to busy to get it taken care of!

x46359 · Post by **x46359** » October 17th, 2007, 5:28 am

Well I dont think it's my cat heat shield since I no longer have a cat

replaced it with a t1r 70r exhaust + test pipe.

I actually took the car in and had the mechanic tighten all the bolts for the heatshield for the header but it's still making the noise.

Jackson...I didn't know there was a o2 sensor on the header but if this piece is in fact loose, is it just a matter of taking the heat shield off and tightening this piece? Or do I have to buy a new header?

Please help...this sound is driving me NUTS!!

tartje · Post by **tartje** » October 17th, 2007, 8:30 am

x46359 wrote:Well I dont think it's my cat heat shield since I no longer have a cat replaced it with a t1r 70r exhaust + test pipe.

I actually took the car in and had the mechanic tighten all the bolts for the heatshield for the header but it's still making the noise.

Jackson...I didn't know there was a o2 sensor on the header but if this piece is in fact loose, is it just a matter of taking the heat shield off and tightening this piece? Or do I have to buy a new header?

Please help...this sound is driving me NUTS!!

there are still heatshields where your exhaust/cat are bolted to the underside of the floorpan when you remove them

this is the underside of my R when we were fitting the de-cat and RM-01A. you can see the heatshields, including where it widens for the cat

x46359 · Post by **x46359** » October 23rd, 2007, 8:41 am

FIXED ... finally. Thanks for the help. I guess two of the bolts came loose.

While I'm on here I got a quick question ... would a 16x7 +38 fit the itr without any fender rolling?