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06-12-2012, 05:20 PM
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#1 |
 
Drives: ZL1 #529 "El-Jefe" Join Date: Mar 2012
Location: Las Vegas, NV
Posts: 668
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Bad exhaust control valves?
Has anyone else had issues with the exhaust control valves not closing all the way? I took it to the dealership today because of a very slight "tinging"/"rattle" noise from under the car. It only happens on take offs from a stop, hit 10-15mph it stops making the noise. Dealer said the valves do not completely close causing the flapper valve to vibrate at take off. Per dealer " no fix" at this time, sent to GM Engeneering.
Just wanted to know if anyone noticed/ has this issue. I know I could remove the valves completely and it would solve the problem but I think the issue should be fix correctly. |
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06-12-2012, 05:33 PM
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#2 |
          
Drives: 2012 ZL1 - #670 Join Date: Jun 2009
Location: Seminole, Fl.
Posts: 8,009
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No problems here ... Does it only happen during slow acceleration?
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06-12-2012, 05:38 PM
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#3 |
 
Drives: 2010 Duramax; 2012 CTS-V Coupe Join Date: Apr 2012
Location: Houston, Tx
Posts: 387
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The valves are open until 1000 rpm's so he has it backwards. The Vettes have the same 'rattle' problem and I've heard the Billy Boat system do it as well. Needs a very light spring installed to take up the slack and stop the rattle but not hinder valve operation.
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06-12-2012, 05:42 PM
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#4 |
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Drives: ZL1 #529 "El-Jefe" Join Date: Mar 2012
Location: Las Vegas, NV
Posts: 668
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Yes only at slow acceleration. I thought it was a loose heat guard. You can really tell when the vehicle is in an enclosed area, you can't miss it then.
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06-12-2012, 07:56 PM
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#5 |
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Drives: 2023 Black ZL1 Auto Join Date: Oct 2009
Location: FEMA Region 4
Posts: 2,935
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I notice a similar sound coming from mine after I start it up in my garage. I havent tried to figure out where it was coming from. Kind of a metallic pinging type of sound.
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06-12-2012, 10:05 PM
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#6 |
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Drives: Camaro's, always have, always will. Join Date: Oct 2010
Location: Home of the brave
Posts: 4,851
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...not sure what you are referring to. Hope you get satisfaction or resolve to the issue. I would like to ad my car makes more noise than a Fourth of July backyard barbeque party at times. I've had a an intermittant rattle in the tail end underneath the car at idle after start up...similar to what you decribe, as if it's in the exhaust, S/C rattling like "mables" at times, creaking, moaning and groaning with the rear axle, belt/pulley noise, syncho's'/forks or mainhshaft noise at low speed, ...eveything comes and goes. It's the nature of the Beast I think....if it becomes persistant and regular to to an everyday situation or does not go away or it gets worse than I would say it is a problem.
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Last edited by OldScoolCamaro; 06-12-2012 at 10:23 PM. |
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06-12-2012, 10:37 PM
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#7 |
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Drives: Camaro's, always have, always will. Join Date: Oct 2010
Location: Home of the brave
Posts: 4,851
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...the car is not your Dad's <or Grand Dad's> Impala....<pure sarcasim> Seriously, HP cars burp, fart, groan and moan..... and from my personal perspective this is the bona fide deal..., but, we need a stage two HP upgrade Chevy..., pulley, CAI, flash tune.....PLEASE!!!!
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In Scott We Trust...all others must show proof.
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06-12-2012, 11:48 PM
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#8 | |
Drives: 2012 ZL1 #1372 Join Date: Apr 2012
Location: wyoming
Posts: 403
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