11-03-2009, 09:59 PM
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#1
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formerly afitx84
Join Date: Dec 2006
Location: Scottsdale, Arizona/Norcal
Age: 21
Posts: 184
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Jingle between cat and headers
When I start my truck, or just at idle, a jingle sound comes from the area near the cat. Nothing is loose, all is tight as can be... but i just cannot understand why it sounds like this. Took off entire cat back and it still continued.
Any suggestions?
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2000 Z71, 6" Procomp Full Drop, Cooper STT Discoverer 35x12.50, Mickey Thompson Classic II 16x10, Rear Leaf Pack, keys,
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11-03-2009, 10:02 PM
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#2
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Registered User
Join Date: Aug 2008
Location: jackson mo
Age: 18
Posts: 578
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Re: Jingle between cat and headers
sub'd. Ive got this jingle as well. Truck in sig.
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98 rclb silverado z71,121k miles, dual 25" thrush glasspacks, 5.7l Vortec, cobra 29 CB, rebuilt 4l60e at 118k miles-(2000 stall converter, shift kit, vette servo, heavy duty clutches), mastercraft 265/75/16 Courser C/T's, JVC KD-300 Hu, MB Quart 12 400rms, hitron HA-1000.1 amp 600rms @ 2ohms
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11-03-2009, 10:08 PM
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#3
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--Tyler--
Join Date: Jan 2005
Location: northern KY
Age: 22
Posts: 6,848
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Re: Jingle between cat and headers
my best guess is your cat itself.
this is a sign your cat is going bad. min had a jingle/rattle for a month or so before it clogged up and the truck would not even run.
but to be safe, look at your collectors, make sure they are still in tack, i have seen some of them break a bolt or two and cause a jingle as well
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2003 Z71 slightly modded.
^^courtesy of xZoomerZx
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11-04-2009, 08:44 AM
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#4
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Turn and Burn
Join Date: Jun 2008
Location: Union, Missouri
Age: 18
Posts: 880
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Re: Jingle between cat and headers
header tick? mine ticks from the LT's. they all do.
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Thanks xZoomerZx
1995 GMC 4x4, 350, w/A/T's,3.73's,Debaged, Heddman LT's w/ Thunderbolt cat and Thrush muffler, TB & Inj. spacer, Big 3 Upgrade, Ultimate TBI mods, AFPR, U D pulleys
5200 lbs. at 14.0MPG
1988 GMC SOLD
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11-04-2009, 03:03 PM
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#5
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Registered User
Join Date: Sep 2007
Location: Cape Cod, MA
Age: 28
Posts: 1,618
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Re: Jingle between cat and headers
When the exhaust is cold, crawl under and pound the cats with your hand. I bet your driver side cat will replicate the sound. A friend of mine who has a 99 NBS with the 5.3 rattles at idle and it's coming from the driver side cat. Mine doesn't rattle at idle, but I can replicate the sound you describe by hitting the exhaust in that area with my hand. It's the internal brick of the cat that is rattling in there and it's a non-issue until either a check engine light comes on with a code indicating that a cat is bad, or a portion of the cat's internal brick becomes detached and lodges itself sideways in there and prevents flow. If that happens, you will know because your symptoms will be similar to what Underpowered mentioned in his reply.
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00 RCSB Z71 / ss Spintech exhaust / Z71 Tahoe valance / EBC slotted&drilled brake rotors / Edelbrock headers / Blackbear tune/ 6000k HID low beam and fog lamps / Auto-headlight mod(nice)/ Vette servo
Wish List: E-fans
My allergies to these fans... has returned-Slapshot
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11-04-2009, 03:08 PM
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#6
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has been "had"
Join Date: Jan 2006
Location: miamisburg, ohio
Age: 28
Posts: 622
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Re: Jingle between cat and headers
+1 on it being the cat itself. seems they like to break down inside of themselves, thus hearing the rattling noises.
__________________
 - i'm new
 <-thanks again, xZoomerZx
96' burb - 6-inch RC, 4.56's, 35's, detroit, SYE, realift, flow 50's, w4m, 06' 17's, other stuff
98' silvy - z71, 285's, flow 50's, 1" block, some crank, blackbear
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11-04-2009, 07:47 PM
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#7
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Registered User
Join Date: Feb 2008
Location: Overland Park, KS
Posts: 1,591
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Re: Jingle between cat and headers
It seems that the stock cats on these trucks aren't very good quality. Mine has already broken up and was shooting out pieces when I got it so I put a pipe in it's place which got rid of the clunking sound and not to mention made me finally hear the 24" Magnaflow.
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95 Sierra C1500
TBI 305, NV3500
10-Bolt 3.42 Open
Custom open air cleaner
Single 3", Thunderbolt cat, 18" d/o Magnaflow, 3.5" tips in front of the rear passenger tire.
New rig (not pictured): 86 Silverado C10 4bbl 350
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11-05-2009, 06:55 PM
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#8
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formerly afitx84
Join Date: Dec 2006
Location: Scottsdale, Arizona/Norcal
Age: 21
Posts: 184
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Re: Jingle between cat and headers
no check engine light. It isn't a crazy loud sound, most of my friends dont pay attention to it unless i point it out, and only happens when i let off the gas or have it at idle.
Also, when I drive around town for a while and park to go in somewhere, while the engine is still warm, the noise goes away when i start it back up again.
__________________
2000 Z71, 6" Procomp Full Drop, Cooper STT Discoverer 35x12.50, Mickey Thompson Classic II 16x10, Rear Leaf Pack, keys,
Last edited by daemanisameanman; 11-05-2009 at 07:08 PM.
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11-05-2009, 07:07 PM
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#9
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Registered User
Join Date: Nov 2007
Location: Statesboro, Georgia
Posts: 425
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Re: Jingle between cat and headers
I had the same problem on my 99 NBS. It turned out to be a flange ear (or something like that) that holds the exhaust system on was loose and I had both of them replaced and it went away.
OR
The honeycomb inside your cat has come loose or broke? 
__________________
99 Chevy 1500 z71
6" Suspension Lift
37x13.50 Nitto Mud Grapplers on 20x9 Pro Comp Xtreme Alloys
5% Tint stacked all around
2.5" Ford Keys
Straight Pipes X-pipe true duals 45 out 45 dumped
More to come...
Last edited by BAP56049; 11-05-2009 at 07:08 PM.
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11-05-2009, 09:34 PM
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#10
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Registered User
Join Date: Oct 2009
Location: SW Missouri
Posts: 1
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Re: Jingle between cat and headers
I had the same issue on a 03 Avalanche with the 5.3L. Took it to the dealer, and something had come loose in the cat itself. They had to replace the cat (under warranty, thank goodness!) and that took care of it.
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11-05-2009, 09:54 PM
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#11
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NBS Owner
Join Date: Sep 2005
Location: Covington, TN
Age: 19
Posts: 263
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Re: Jingle between cat and headers
yep sounds like the cat to me. my obs made a rattle sound and it ended up bein the cat. had that sucker cut out!
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2002 Chevy C1500 ECSB, 5.3L, White, Tint, 2" Springtech Spacers, 265 Hankooks on 18" Gunners, Cherry Bomb Extreme, Infinity Reference Components, JL Audio subs, a little colormatching, Eskys, and a speed grille
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11-06-2009, 12:21 AM
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#12
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formerly afitx84
Join Date: Dec 2006
Location: Scottsdale, Arizona/Norcal
Age: 21
Posts: 184
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Re: Jingle between cat and headers
oh boy, just what i want to hear when im trying to sell it.
thanks for the help guys
__________________
2000 Z71, 6" Procomp Full Drop, Cooper STT Discoverer 35x12.50, Mickey Thompson Classic II 16x10, Rear Leaf Pack, keys,
Last edited by daemanisameanman; 11-06-2009 at 12:25 AM.
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11-06-2009, 07:55 AM
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#13
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Registered User
Join Date: Nov 2009
Location: Missoula,MT
Posts: 6
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Re: Jingle between cat and headers
Take a look at the little metal collars on the o2 sensors.miNe does it too.
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Drivin' Chevys and Ridin' Harleys!!
Last edited by DUALLS; 11-06-2009 at 07:55 AM.
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