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Old 04-03-2010, 03:57 PM   Thread Starter #1
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Default Bad Cat

Ok so lately I been hearing this rattling noise when I accelerate all from 0-45mph. and I hear it the most when the rpms are going and only in drive. At first I thought this might of been a tranny issue but I'm pretty sure it's not. I think it might be one of my cats gone/going bad, only reason I say this is because on my old car when my cat went bad I had the same exact noise. So My question is how can I can tell, w/o taking them off, if they've gone bad. Also I have no SES lights either. Thanks
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Old 04-03-2010, 04:01 PM   #2
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Default Re: Bad Cat

could be your exhaust heat shield.....i remember i heard the same noise at the same speeds. replaced it and been good since
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Old 04-03-2010, 04:31 PM   Thread Starter #3
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Default Re: Bad Cat

were they just loose or broke or what? Also which one?
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Old 04-03-2010, 04:37 PM   #4
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Default Re: Bad Cat

i would honestly have to guess it was broken since the dealership replaced it. they did it for free even though i was wayyyyyyy out of warrenty. so see if thats the case. i don't have any more info besides that.
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Old 04-03-2010, 04:45 PM   Thread Starter #5
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Default Re: Bad Cat

ight thanks, imma take a look at them and see wasup.
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Old 04-03-2010, 05:30 PM   #6
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Default Re: Bad Cat

I would check the sheild... you will get a check engine light for sure if a cat goes...
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Old 04-03-2010, 08:04 PM   #7
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Default Re: Bad Cat

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Old 04-03-2010, 08:36 PM   #8
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Default Re: Bad Cat

^ what I was thinkin too
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Old 04-03-2010, 10:40 PM   #9
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Default Re: Bad Cat

If ur cat goes bad u will get a SES light. A sign of a cat goin is a boiled egg smell or a really bad fart smell. lol. It may b the Y pipe cat too but u wont get a code cuz its not monitored by anything. If u can raise the car or get under it n bang on the Y pipe cat n listen for shake in it. Sounds like sand in the pipe. Do u kno if the cat has ever been replaced before?
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Old 04-03-2010, 10:51 PM   #10
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Default Re: Bad Cat

I think he has an aftermarket ypipe with no cat but I could be wrong...
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Old 04-04-2010, 01:45 PM   Thread Starter #11
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Default Re: Bad Cat

yea im refering to my y-pipe cat, and it's stock y-pipe. only exhaust that has been replaced on my car is the cat-back
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Old 04-04-2010, 02:41 PM   #12
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Default Re: Bad Cat

Originally Posted by durell_usmc View Post
yea im refering to my y-pipe cat, and it's stock y-pipe. only exhaust that has been replaced on my car is the cat-back
oh... hmmm could this be an excuse to upgrade? lol.

I have an OEM Ypipe for cheap if your not ready to drop $300+ on an aftermarket
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Old 04-04-2010, 02:57 PM   Thread Starter #13
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Default Re: Bad Cat

oh hell yea wifey already approved tha upgrade lol if it is the y-pipe. So sometime this week imma check the heat sheilds if it's not those then as soon as I get some money it's a new y-pipe.
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Old 04-04-2010, 03:28 PM   #14
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Default Re: Bad Cat

Originally Posted by durell_usmc View Post
oh hell yea wifey already approved tha upgrade lol if it is the y-pipe. So sometime this week imma check the heat sheilds if it's not those then as soon as I get some money it's a new y-pipe.
Repeat to Wife:
"Yes baby, its the y-pipe.. I know it sucks but these things happen. Racingline has a great replacement... o well "
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Old 04-04-2010, 08:30 PM   #15
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Default Re: Bad Cat

Originally Posted by CleanMaxx View Post
Repeat to Wife:
"Yes baby, its the y-pipe.. I know it sucks but these things happen. Racingline has a great replacement... o well "
Lol. Great excuse.
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Old 04-04-2010, 11:58 PM   #16
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Default Re: Bad Cat

Its not a bad cat. Its a bad Squirrel.
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Old 04-05-2010, 12:02 AM   #17
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Default Re: Bad Cat

If you able to get on the underside of the engine bay...this link shows you how a bad cat looks like.

Bad Cat Inspection
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