I've got an 03 TE 6mt, and the cat's rattling. Seems like its the rear manifold. Has anyone had this problem.. If so, what exactly is making noise? would i have to replace the rear manifold?

 

just a guess, heat shield? ive had this problem before but not on a maxima

 

I've tried sticking something between the shield and cat to hold it from moving and it didn't do anything.

 

do you have high miles on your maxima? I haven't had a car with CAT. CONV. rattling but allways get cars in with loose heat shields or other loose or broken supporting brackets.

 

I just hit 84k

 

I got headers, problem solved lol. I had the front pre-cat blow when I first got the car and was replaced under warranty, then a couple months ago my rear pre-cat went and that was around the time I wanted my Cattman headers.

 

Is there anyway to gut the the precats?

 

Yeah. But you might not want to do that as it will most likely still rattle. The cat rattles because it is probably plugged.

 

what do you mean by plugged?

 

Over time, cats become plugged with carbon.

 

You'll really have fun when they fall apart b/c it runs too rich. They break apart and plug up the main cat. Kiss your engine goodbye when the back pressure gets done blowing all of your oil out within 1k mi.

Yeah, I know I've posted this a few times, but I'm trying to give fair warning on these WORTHLESS cats. Just gut or remove all of them. They do nothing but cause problems.

 

After i gut it would it throw a CEL?

 

If you're gut the cat, might as well just get an aftermarket y-pipe. I had aftermarket y-pipe for a while and when I put my stock y-pipe back on, I lost about 30miles to the tank.

 

has anyone done this? how do you gut it?

 

^^ there are several threads that talk about it....i believe one has some decent directions

 

do you just hammer out everything in it?

 

gutting the pre cats wont throw a code but you should first spend some time under your car checking for loose heat shields. If its not a heat shield that is rattling it is more than likely ceramic material in the cat has broken loose and is moving around but that's too common in OEM cats.

Gutting your cats may gain you a few HP but it is rough on the environment

 

this might sound weird, but would the car run right if i only gut the one that's making noise?

 

I have a 2001 se, ive had my exhaust rattleing at the cat for a few months now since i had a new catback put in. The place i had it done at said there was a bracket missing that holds the pipe up off of the support right behind the cat. Could be the same issue.

 

It sounds like it's coming from inside

 

Drop your cat and inspect it...I found a Stainless steel washer inside mine once that i must have dropped during a test fit!

 

I gutted both precats. It was a PITA, But no more rattling.. I think i might need to do the o2 sim.

 

i might gut my pre cats. i have allmost 180k and im sure they are clogged all to hell.


headers would be the best option tho. performance wise..

 

Depending on what state/country - you may be able to have it replaced under warranty. In Canada, the Gov forced Nissan to warranty emission related parts up to 120K km. Had my pre-cat replaced at 115K when it started rattling inside.

 

true, But this is nearly free to do..

 

Dang, i shoulda checked on that. It started rattling around 80k.

 

I need to look into this. I'm having the same sound and I think I'm running rich and my car has over 215KM. If I got a Megan Cat-back and say a aftermarket Y-pipe would it eliminate my problems? Thanks

 

mine only rattles when i go up a hill and its starting to get louder its b**S**t

 

Are you sure thats the precat?

 

I'm pretty sure Nissan only warranties the cats up through 80k.