08-23-2012, 12:11 PM | #15 |
Drives: 2013 ZL1 Conv. Join Date: Jan 2009
Location: Texas
Posts: 131
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should valves be open at idle?
I just picked up my 2013 ZL1 last week, convertible, manual.
Are the valves supposed to be open at idle? Mine are open at idle, and I can't really claim to hear a strinking difference in sound volume with rpm. I also pulled the fuse, and with no obvious difference. I am wondering if my valves are not functioning properly, which may not be a bad thing. |
08-23-2012, 02:14 PM | #16 | |
Drives: GM Vehicles Join Date: Jun 2010
Location: Michigan
Posts: 9,328
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Quote:
Brandon Chevrolet Customer Service
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08-23-2012, 02:17 PM | #17 |
Drives: someday a convertible Join Date: Sep 2009
Location: PA
Posts: 266
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Google (Dual mode exhaust, NPP) you will find info in the Convette forum..
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08-23-2012, 02:35 PM | #18 | ||
Drives: ZL1 #529 "El-Jefe" Join Date: Mar 2012
Location: Las Vegas, NV
Posts: 668
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Quote:
Quote:
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08-23-2012, 03:20 PM | #19 | |
Drives: 2012 Blk ZL1 Join Date: Dec 2011
Location: Baton Rouge, LA
Posts: 938
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Quote:
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08-23-2012, 04:46 PM | #20 |
Drives: Black 2012 Camaro ZL1 #740 Join Date: Nov 2011
Location: Sherwood, Oregon
Posts: 68
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Just talked to Dealership and was informed that Chevrolet engineering department is working on the issue, BUT it may be something I will just have to live with..."I DON'T THINK SO"!!! I will up-date as it develops.
All in All I LOVE THE CAR!!
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08-27-2012, 06:53 PM | #21 |
Drives: ZL1 #529 "El-Jefe" Join Date: Mar 2012
Location: Las Vegas, NV
Posts: 668
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For what it's worth, I took my car to the dealer today because the service director called me and said GM had a fix for the valve issue.. They had to reprogram the "fuel pump flow control module"... "software anomaly in fuel pump control module".. It seemed to fix the problem..
Last edited by Al C.; 08-27-2012 at 07:06 PM. |
08-28-2012, 05:06 PM | #22 | |
Drives: Black 2012 Camaro ZL1 #740 Join Date: Nov 2011
Location: Sherwood, Oregon
Posts: 68
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Quote:
Thank you!! I will pass it on to my dealer!!!!
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10-03-2012, 04:16 PM | #23 | |
Drives: Black 2012 Camaro ZL1 #740 Join Date: Nov 2011
Location: Sherwood, Oregon
Posts: 68
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Quote:
Thank again for all the help!!
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10-03-2012, 04:25 PM | #24 |
HAMMER PILOT
Drives: 13 ZL1#182, 85 CJ7, 16 Silverado Join Date: Nov 2011
Location: Tucson AZ
Posts: 4,386
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I have the same noise, it even happens with the mild to wild switch. For that reason I don't think it would be the flaps. But who knows.
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10-03-2012, 06:42 PM | #25 | ||
Drives: 2012 (ZL-1) #468 Join Date: Apr 2012
Location: Veradale, Washington
Posts: 651
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Quote:
Mine Does Not Sound That Good. Hopefully, After Break-In It Will Have That Sweet Of Sound
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10-03-2012, 09:22 PM | #26 |
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 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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Last edited by OldScoolCamaro; 10-03-2012 at 10:10 PM. |
10-03-2012, 11:16 PM | #27 | |
Drives: ZL1 #529 "El-Jefe" Join Date: Mar 2012
Location: Las Vegas, NV
Posts: 668
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Quote:
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02-11-2013, 08:09 PM | #28 | |
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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