Ahmad_1290

iTrader: (2)

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?

Stormzusmc

iTrader: (17)

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

Ahmad_1290

iTrader: (2)

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

nsnrider

iTrader: (59)

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.

Ahmad_1290

iTrader: (2)

I just hit 84k

skidz88

iTrader: (1)

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.

Ahmad_1290

iTrader: (2)

Is there anyway to gut the the precats?

rroderiques77

iTrader: (45)

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

Ahmad_1290

iTrader: (2)

what do you mean by plugged?

rroderiques77

iTrader: (45)

Over time, cats become plugged with carbon.

Child_uv_KoRn

iTrader: (7)

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.

Ahmad_1290

iTrader: (2)

After i gut it would it throw a CEL?

IHAVEA2KMAXIMA

iTrader: (7)

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.

Ahmad_1290

iTrader: (2)

has anyone done this? how do you gut it?

hi-tek22

iTrader: (4)

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

Ahmad_1290

iTrader: (2)

do you just hammer out everything in it?

Feldman

iTrader: (1)

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

Ahmad_1290

iTrader: (2)

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

mlipnickwc

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.

Ahmad_1290

iTrader: (2)

It sounds like it's coming from inside

CMax03

iTrader: (3)

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

Ahmad_1290

iTrader: (2)

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

SurraTT

iTrader: (59)

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..

maxed

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.

Ahmad_1290

iTrader: (2)

true, But this is nearly free to do..

Ahmad_1290

iTrader: (2)

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

ShippedOut

iTrader: (1)

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

rev2red

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

Ahmad_1290

iTrader: (2)

Are you sure thats the precat?

AEMAXIMA01

iTrader: (3)

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