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Thread: Weird Rattling Sound??
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04-09-2007, 08:58 AM #1
Weird Rattling Sound??
my car just started doing this but when i start the car in the morning it has some weird rattling sound comming from under the car and i cant figure out what it is. what could this be.
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04-09-2007, 10:17 AM #2
- Join Date
- Mar 2007
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- NC
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NBM- 1998Z28
The insides of your cats coming loose!
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04-09-2007, 10:35 AM #3
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04-09-2007, 10:48 AM #4
- Join Date
- Mar 2007
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- NC
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- 421
NBM- 1998Z28
I had the problem for about a year until I put the LTs+catted y on mine and when we took off the old y-pipe you could shake it and hear something rattling inside the cat. The fix? I don't know unless you replace the cat. I shook mine pretty hard but what ever was loose in there was to big to fall out. Just get use to it I guess.
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04-09-2007, 10:51 AM #5
- Join Date
- Jul 2005
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- Jacksonville, FL
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- 2,723
Make sure that's what it is first - try tapping on them with a rubber mallet when cold to verify. If one is coming apart GM is now covering them for 10yrs/120K. If you have a SES light get it scanned.
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04-09-2007, 11:17 AM #6
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04-09-2007, 11:40 AM #7
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- Jul 2005
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- Jacksonville, FL
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Stop by somewhere that'll read codes free like Auto Zone, etc. Don't know if they can read history codes if the light is off? - but P0420 and P0430 remain in "history" for 40 ignition cycles. Visit www.gearchatter.com and look up the above codes for your year for more info.
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04-09-2007, 11:46 AM #8
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04-09-2007, 12:55 PM #9
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04-09-2007, 01:12 PM #10
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- Jul 2005
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- Jacksonville, FL
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P0420 is for the drivers side cat if the code was thrown. I'd still get it scanned/wait for the SES to verify before contacting the dealership for free replacement. Don't want to find out it's something else and have them charge you. Here's the letter in case you need it: http://img518.imageshack.us/img518/4605/gmletterle2.jpg
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04-09-2007, 03:15 PM #11
ok so i went and got the scanner tool from advanced auto and it said there werent any failures detected. the weird thing is the guy at the counter had a sweet lookin lowerd ls1 ws6 so he helped me try to figure it out but still no codes thrown everything passed.
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04-09-2007, 03:38 PM #12
- Join Date
- Jul 2005
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- Jacksonville, FL
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If you don't have any loss of power or driveability problems I'd continue driving - if the light comes on have it read. Like I said earlier don't know if their scanners can read history codes once the light goes back off. Still could be something else. Just didn't want you to bring it to the dealer for a cat if that wasn't the problem. Buddy of mine just got the P0420 code, no aparent rattle - dealer replaced it free.
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04-09-2007, 07:51 PM #13
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04-19-2007, 08:07 AM #14
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04-19-2007, 08:34 AM #15
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04-19-2007, 08:48 AM #16
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04-20-2007, 10:00 AM #172002 A4 Z28: SLP LM exhaust and HSW 100whp dry shot.
NA: 323.4WHP@5360 RPMs, 344.2ft-lbs@4610 RPMs,
N2O: 417.0WHP@5200 RPMs, 467.6ft-lbs@4210RPMs
NA: 13.351@107.48mph, N2O: 12.324@117.88
http://www.youtube.com/watch?v=JMHmdFywR0w
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04-20-2007, 10:50 AM #18
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04-22-2007, 02:51 PM #19
- Join Date
- Jan 2007
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- huntsville,al
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- 5
onyx black- 2002 b4c
your sensors are on the cats
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04-22-2007, 02:54 PM #20
- Join Date
- Jan 2007
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- huntsville,al
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- 5
onyx black- 2002 b4c
mine are rattling real bad. i am gonna talk to the chev dealer here and see if they will honor the new 10yr/120mile warranty.
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