All of a sudden since yesterday Im having some issues and Im guessing it has something to do with my Crawford HFCs???

1. Random rattling sound coming from under body passenger side. sound is not consistent.
2. Weird smell coming when Im sitting in the car and windows are down.
3. Loss of power (this one Im not 100% sure).

Any ideas what might be the issue?
Btw, its a 2006 g35 coupe 6mt

 

Also, I bought the HFCs used and have had them on my G for little over a year, and didnt have any of these symptoms before.

 

I found this...
https://g35driver.com/forums/3721998-post5.html

So, that might be the rattling issue... as the rattle is not at a certain rpm or anything.
When I crank up the car, if the rattle starts then, it stays. And its LOUD!
If the rattle doesnt start when I crank up the car, it never comes.

But what about the smell???

 

could very well be the comb inside the cells may have cracked and gone bad. Thats the only thing i can think of that have those 3 symptoms you described.

1. Rattling Sound - Cells have cracked and the core pieces are rattling around in the converter.

2. Smell - Cracked/broken core pieces are not filtering/absorbing the exhaust which is causing it to just run straight through, hence smelling that fuel and unconverted exhaust gases

3. Loss of power - Broken Cells/core pieces could be clogging the cats which is causing the loss of power.


I remember you bought those cats used and had quite a bit of miles on them. So they could just be bad and time to replace them.

 

^ Yes, I asked Jake, n thats what he guessed as well.
But, wouldn't the rattle be there every time I crank up the car?
Like I said...

 

Could be the way the core pieces move around after driving your car around. Everytime you drive it it moves the broken pieces around and it settles differently, so sometimes loud rattles, sometimes no rattle...thats my best guess.

I would definitely check the heat shields/O2 sensor, etc and make sure nothing is loose. If it isn't those, then most likely the cats.

 

Yea nothings lose.
I took it to a muffler shop and had them bend the metal shields above the HFCs so that they dont touch the HFCs.
Havent been able to reproduce the sound since... if it returns, I will take the HFCs out and put the stockies back on.

 

I was about to say the exact same thing that Domenic said.. (great minds).. I hope all is well now Bro.. I know how much it sucks to have your car working, then all of a sudden when things are going well, something rains on your parade.

 

^ haha ya, you said it!
just when everything is going groovy, something pops out of nowhere.
my gf sometimes doubts if she is the #1 girl in my life or my G.

 

I'm right there w/ ya bro.. Especially after this next batch of upgrades that I've done/am in the process of doing.. I'm not done YET.. HEHEHEHEHEHE!!!

You have a Girlfriend? Dang.. that's news to me.. (not saying you couldn't get one, I just always assumed you had a monogomous relationship w/ the G... PLAYA PLAYA!!!)

 

BALLER!

Haha! Over a year... its on my fb.

 

so, took the HFCs out and my passenger side HFC is busted!

driver side pic... a-ok condition!


passenger side pic... busted!


hope the symptoms mentioned above help somebody diagnose the problem in the future.

 

crawford hfc's! mine did that too! at least im guessing their crawfords
edit finally read the thread, but yea mine did the same thing...since i bought them from a member crawford couldnt do anything since i didnt have a receipt

 

my passenger side did the same thing recently (20+K miles)...

I didnt notice which side your is op - but there is a used one (not broken) for sale in the marketplace... I would have bought it if I saw it before purchasing a new replacement.

eventually all hfc will go bad... most ppl say about 20K is the expected life... some get more, some get less...

 

^I saw that thread, I mght pick it up. Thanks!