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Old 10-03-2012, 09:22 PM   #26
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....not sure what the OP means by buzzing when the dual mode valve opens, but...I ask....the motor is turning pretty good up to that point is it not???....and... when the valve opens the chamber all double H E hockey sticks lets loose...sooo, how can one even hear anything else over the raucous symphony of Chevrolet LSA and exhaust at that point I ponder..... I kinow I can't.....I think it opens at about 3,200 RPM or so...and when it does...Sweet Jesus have mercy..... Adendum..part throttle operation should have no effect on the exhaust system/dual mode, and, since the the system has been replaced from the cats back...that's not the issue if the customer still hears something. The OP should get in the car, with the tech driving, and point out the issue if it is repeatable while the car is in operation in my opinion.
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Old 10-03-2012, 11:16 PM   #27
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Originally Posted by Neil's BlackZL1 View Post
Passed the info on to my dealer, GM has sent a bullitan out regarding the issue and reprogramming the fuel pump seams to fix the noise (I HOPE). I had mine done about 2 weeks ago, but I have been out of town off and on since i had it done so I haven't really had time to test it out. I plan on putting on some miles this weekend so we will see.

Thank again for all the help!!
No problem. I've driven 800 miles since reprogramming issue, I haven't heard that noise since. Enjoy that beast!
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Old 02-11-2013, 08:09 PM   #28
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I have a vid of my zl1 where you can really hear these flaps going... so is this normal or not?
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Old 02-11-2013, 09:17 PM   #29
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I have a vid of my zl1 where you can really hear these flaps going... so is this normal or not?
NOT!
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Old 02-12-2013, 12:48 PM   #30
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I have the same noise. My wife drove her car beside mine and said its louder outside of the vehicle than you think. Its only at lower rpms when I start to speed up. Very annoying if you ask me for a car I paid 65k for. I also have the rubbing noise in the rearend and have had the dealership change the rear fluids. Still there!!! I plan on bringing it back to the dealership and discussing the exhaust noise and changing the fluid in the rear again. My dealership acted like they had no clue about the issues... UGH!
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Old 02-15-2013, 10:10 PM   #31
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Originally Posted by Joco28 View Post
I have a vid of my zl1 where you can really hear these flaps going... so is this normal or not?
That is exactly how mine sounds...
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Old 02-16-2013, 09:29 AM   #32
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That is exactly how mine sounds...
Yeah I've seen a couple other vids on YouTube with similar sounds, I don't think it really matters.
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Old 02-16-2013, 04:42 PM   #33
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Quote:
Originally Posted by tomster View Post
That is exactly how mine sounds...
Quote:
Originally Posted by Joco28 View Post
Yeah I've seen a couple other vids on YouTube with similar sounds, I don't think it really matters.
That sound is normal if the system is operating (meaning that you don't have a Mild2Wild or some other aftermarket switch installed).

That mechanical "clack" is the sound of the valves closing when you rev up, and opening again when the engine spins back down to idle.
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Old 03-19-2014, 12:25 PM   #34
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Noisy actuators

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Originally Posted by Neil's BlackZL1 View Post
It is an Auto...I was told I will hear something today. I will post what they say
Neil- I have a "14 1le with the same issue. I am in Portland and wanted to know what dealer you took it too since my dealer has never heard of this problem. Thanks in advance
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Old 03-19-2014, 02:13 PM   #35
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Mines a 6 speed manual and does it too.
I have the same problem at start up. Mine is also a 6 speed. It seems to quiet down after the exhaust warms up a bit.
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Old 03-19-2014, 02:20 PM   #36
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My 2014 (automatic) ZL1's exhaust made a light rattlesnake-like rattle coming from the back which increased in frequency with the increase in RPM. It did not rattle when parked, when revving in park, or at any point in driving when the gas pedal was not being pushed (braking / deceleration). It also never went away no matter how warmed up it was.

IT DROVE ME NUTS!

Did a fuse pull this weekend and the sound is completely gone.
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Old 03-20-2014, 11:34 AM   #37
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Originally Posted by jamekitz View Post
My 2014 (automatic) ZL1's exhaust made a light rattlesnake-like rattle coming from the back which increased in frequency with the increase in RPM. It did not rattle when parked, when revving in park, or at any point in driving when the gas pedal was not being pushed (braking / deceleration). It also never went away no matter how warmed up it was.

IT DROVE ME NUTS!

Did a fuse pull this weekend and the sound is completely gone.
the fuse pull does not solve this problem. Trust me I know
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Old 03-21-2014, 05:21 PM   #38
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Originally Posted by SSSylentZL1 View Post
the fuse pull does not solve this problem. Trust me I know
Phht. Aye-aye, Captain!

And actually, because I was responding to the Neil's BlackZL1's original question, which, due to the ambiguity with which it was phrased allows room for interpretation, it does fix this problem. Perhaps not his problem, but my car's problem could have been described the exact same way and the fuse pull fixed it.

Trust me, I know.

Last edited by jamekitz; 03-21-2014 at 05:38 PM.
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Old 03-21-2014, 06:30 PM   #39
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Quote:
Originally Posted by jamekitz View Post
Phht. Aye-aye, Captain!

And actually, because I was responding to the Neil's BlackZL1's original question, which, due to the ambiguity with which it was phrased allows room for interpretation, it does fix this problem. Perhaps not his problem, but my car's problem could have been described the exact same way and the fuse pull fixed it.

Trust me, I know.
Thing is I pulled my fuse as well and I still hear the flaps as I decelerate.
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Old 03-26-2014, 04:53 PM   #40
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I just got a DashLogic box and it will hold my flaps open or closed. I wonder if holding them closed would solve your noise issues?
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