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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > rattleing under car in mufler? cats?



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      12-12-2010, 09:44 PM   #1
k3m0-330i
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rattleing under car in mufler? cats?

Well friday was siting in the car and i hit the car to 1500 rpm and i heard a rattle so i shut the car off and started it again and reved the engine and it rattled.

i went to jiffylube lifted the car and had a friend hit the gas, it sounds like rocks are in the exhaust. and i take a look at the cats and there discolored like purpleish blueish. and i have a check engine for about a 2 months and when i scaned it it says system to lean so i thought it was because of my muffler. so now i find it its becuase its my cats.

my question is now.

what can i do to fix this since cats are like 2k.

can i take them out and gut them?(was reading people have done it then 02 sims)

and why am i getting this at a low mileage(70k, car is never beat on?)

all help is wanted thanks guys.
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      12-12-2010, 09:47 PM   #2
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well either way, your warranty coveres cats till 80K so if its bad you get free ones ....yay!!!!


they may have just blown out, but thats why they are warrantied, they couldent have died at a better time...that is if they are dead, as you would have more then likley thru a code but their are chances that wont happen. our A6 had a cat die and no codes were lit, it was just enufe not to throw a code but was replaced and the marbles went with it.



by the way 80K is government mandated warranty, you factory new car warranty died at 50K
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      12-12-2010, 09:53 PM   #3
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Quote:
Originally Posted by -c- View Post
well either way, your warranty coveres cats till 80K so if its bad you get free ones ....yay!!!!


they may have just blown out, but thats why they are warrantied, they couldent have died at a better time.



by the way 80K is government mandated warranty, you factory new car warranty died at 50K
OMG if this is true i love u lol i have a muffler on the car u think they will not fix it becuase of this? like void it?
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      12-12-2010, 10:28 PM   #4
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Quote:
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OMG if this is true i love u lol i have a muffler on the car u think they will not fix it becuase of this? like void it?
yes they will-they will use any excuse noting you changed the backpressure and subsequently the pressure in the cats
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      12-12-2010, 11:16 PM   #5
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i assume you're talking about the secondary cats? if you are screw it and gut them out u don't need O2 sensors.
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      12-13-2010, 07:47 AM   #6
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What happends if I put my oem muffler on it and bring it in?
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      12-13-2010, 02:09 PM   #7
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then your fine
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      12-13-2010, 04:00 PM   #8
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Quote:
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well either way, your warranty coveres cats till 80K so if its bad you get free ones ....yay!!!!


they may have just blown out, but thats why they are warrantied, they couldent have died at a better time...that is if they are dead, as you would have more then likley thru a code but their are chances that wont happen. our A6 had a cat die and no codes were lit, it was just enufe not to throw a code but was replaced and the marbles went with it.



by the way 80K is government mandated warranty, you factory new car warranty died at 50K
I think you have that wrong:

"the vehicle is older than 1996 and has more than 50,000 miles or it's a 1996-and-later vehicle with more than 80,000 miles."

http://www.ehow.com/list_7194804_cat...rter-laws.html

OP needs more than 80K for it to be covered.

BTW, if you changed your muffler, don't you need to cut it off? The dealer can easily identify welding and obviously a clamp....
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      01-07-2011, 07:55 AM   #9
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Well I droped my car off last week for a day and they said my cats are bad. So I asked them what to do they said it's under fed warranty 8 year or 80k. I droped it off yesterday and they're still working on it as we speak I am picking it up today so hope the rattleing is gone and I wout have check engine... But I'm not complaining they gave me a loaner even tho I don't have warranty so I will say they are taking care of me
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