03-30-2015, 05:39 PM | #15 |
Drives: 02 Z06, 95 Trans Am, 2012 ZL1 Join Date: Mar 2012
Location: Southeast
Posts: 1,838
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First off, a catch can is not going to fix any kind of ignition knock. Secondly, a completely stock car shouldn't be knocking at all. Not even with bad gasoline. If the knock sensors and PCM are working like they're supposed to they should pull some timing and you will never hear the knock. So if you're still getting audible knock then you have some really really bad gasoline or your PCM is not doing it's job. I would take it to the dealer to evaluate it before you touch anything. The PCM can easily pull 20° of timing out. So if it is doing that and you still are hearing knock something is very wrong.
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Bryan 2018 ZL1 M6
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03-30-2015, 05:55 PM | #16 | |
Drives: ZL1 1LE A10 Join Date: Mar 2015
Location: CA
Posts: 1,093
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Quote:
I've never had a catch can solve problems for me in the past but I buy into the theory that the oil getting into the combustion chamber can cause knocking. I don't really expect it to fix it, but it's worth a try considering I think it's good to have anyway and should in no way harm my warranty. Also, typically (I believe) there will be a slight knock or "tat tat tat" which gets detected and then the computer retards the timing and then it goes away. That is exactly whats happening to me, except it comes back again next time I go WOT. Anyway, I don't believe I have the answer, if I did I'd solve it. I'm just trying to take this one step at a time and not involve the dealer if I can avoid it. Before I go to the dealer, I want to have some tangible evidence of whats going on or else they'll just tell me "its normal". The engine in my 2011 Mustang GT made a rattling noise at 3000rpm and the dealer said it was normal. Shortly after trading it in, that Mustang's engine blew up (lucky me). So I don't like it when the dealer tells me "it's normal" hahaha
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Current: 2019 ZL1 1LE A10 Mods: MPS4s Tires | Borla Atak | CF Steering Wheel Previous: 2018 ZL1 1LE M6 | 2017 Z06 Z07 M7 | 2017 GS A8 | 2015 ZL1 M6 | 2013 GT500 |
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03-30-2015, 07:29 PM | #17 |
Drives: 2023 ZLE Join Date: Jun 2009
Location: Detroit
Posts: 1,717
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I have owned two ZL1's and always run 93 octane fuel. I think it would be very difficult to hear spark knock. Not sure what you are hearing. Maybe something is loose or ratting under the car. You could purchase a data logger and monitor knock regard to try to correlate to when you are hearing this sound. I have a dash mounted data logger that's pretty handy. Data file can b opened and plotted in MS Excel. If it is spark knock, you would likely see it in knock regard.
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03-30-2015, 09:04 PM | #18 |
Drives: 2018 Summit White Camaro 1SS Join Date: Mar 2014
Location: Pasadena, CA
Posts: 352
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Add some Torco.
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'18 Satin White Vinyl Wrapped 1SS, 6MT, Low Gloss Black Wheels, NPP Dual Mode Exhaust
Added: Diode Dynamics Black LED Sidemarkers, GM Dark Finish Tailights, GM ZL1 Black 3rd Brake Light, Black Plastidipped Bowties(front/rear), AFE Dry Drop In Filter, 12mm Spacers(front/rear) |
03-30-2015, 09:06 PM | #19 |
Hide! My wife's coming!
Drives: 2013 Chevrolet Camaro ZL1 Join Date: Jun 2011
Location: Las Colinas, TX
Posts: 1,442
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I've had detonation issues from bad gas and you will not hear it. You might feel some hesitation when it happens but that's about it. Take it to the dealer.
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2013 Camaro ZL1 Convertible CRT - 630 RWHP / 620 RWTQ - ADM Performance Built/Tuned - ZL-700 Package - LS9 CAM - Lingenfelter CNC Ported Heads - Stainless Power Headers
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03-30-2015, 09:43 PM | #20 |
Drives: 2018 Triple Black ZL1 A10 Join Date: Mar 2015
Location: MS Delta
Posts: 47
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Take it to the dealer. Put the complaint/question on paper for future use if needed
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03-30-2015, 09:44 PM | #21 | |
Quote:
Excellent choice. You will be able to view timing being pulled when at WOT along with knock and other critical data. All the best, -- Vick Sent from my iPad using Tapatalk |
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03-30-2015, 11:00 PM | #22 |
Drives: 2013 ZL1 M6 Join Date: Oct 2013
Location: Nor Cal
Posts: 1,825
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Abel is the dealer you want to take it to. A bit of a drive from your location to Rio Vista, but they will get you sorted out. Be sure to call in advanced to make an appointment because they do a lot of Corvettes and are busy all the time. I make an 1.5 hour drive there because I trust them, and they do a lot of performance and race car prep. Ask for Rich Wilhoff.
http://www.yelp.com/biz/abel-chevrol...k-co-rio-vista |
03-31-2015, 06:53 PM | #23 |
Account Suspended
Drives: 2014 ZL1 Join Date: Jan 2015
Location: Long Island, NY
Posts: 342
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Make sure the dealer has a world class tech. There actually certified to work on our cars.
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03-31-2015, 10:08 PM | #24 |
Camaro owner for 29 years
Drives: 96 Viper GTS/09 Sky Redline/95 Z28 Join Date: Jul 2008
Location: Texas
Posts: 115
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I would get a recognized member from here to drive your car. After having your GT500 for so long, you knew every sound and feeling that car had. If something was "out of whack" on another guys new one, you would have picked up on that instantly. Same thing here.
Lets hope it is just something like how your driveshaft had a sticker on it that came loose on your GT500 and was whacking the underside of the car on each rotation. BTW, I'm right there with you in that the 2013 GT500 is the clear winner -on paper- (lower weight/more power) and I'm still a huge fan of those cars. But the ZL1 with those bad ass mag shocks and superior chassis make it the better drivers car. IMO. |
03-31-2015, 10:58 PM | #25 |
Drives: ZL1 1LE A10 Join Date: Mar 2015
Location: CA
Posts: 1,093
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I got anxious and decided to take it in today. Exactly what I said would happen, happened...
He said, "That's normal". In fact, he even said, "These cars knock all the time". *sigh* The tech went on a ride along with me and of course the car was much better behaved (I hate it when that happens). However, I was able to reproduce the issue a little and he didn't seem concerned. Though I'm not sure I trust this guy's opinion since he said "these cars knock all the time". My problem with this is: 1. I drove 2 other ZL1s and neither of them made these noises. 2. I plan to add power mods in the future and want a healthy engine, not something that I don't trust and will live in fear of voiding my warranty.
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Current: 2019 ZL1 1LE A10 Mods: MPS4s Tires | Borla Atak | CF Steering Wheel Previous: 2018 ZL1 1LE M6 | 2017 Z06 Z07 M7 | 2017 GS A8 | 2015 ZL1 M6 | 2013 GT500 |
03-31-2015, 11:02 PM | #26 | |
Drives: ZL1 1LE A10 Join Date: Mar 2015
Location: CA
Posts: 1,093
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Quote:
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Current: 2019 ZL1 1LE A10 Mods: MPS4s Tires | Borla Atak | CF Steering Wheel Previous: 2018 ZL1 1LE M6 | 2017 Z06 Z07 M7 | 2017 GS A8 | 2015 ZL1 M6 | 2013 GT500 |
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03-31-2015, 11:16 PM | #27 | |
Drives: 02 Z06, 95 Trans Am, 2012 ZL1 Join Date: Mar 2012
Location: Southeast
Posts: 1,838
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Quote:
These cars shouldn't knock if you are using premium. Then again the mechanics are probably accustomed to idiot owners that put in 87 octane in their performance cars. "cough, vette"
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Bryan 2018 ZL1 M6
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03-31-2015, 11:21 PM | #28 | |
Drives: ZL1 1LE A10 Join Date: Mar 2015
Location: CA
Posts: 1,093
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Quote:
I'll see what my DashLogic says when it gets here. I'm willing to bet it will say I'm running rich or lean and it will probably be a MAF sensor issue. *crossing fingers*
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Current: 2019 ZL1 1LE A10 Mods: MPS4s Tires | Borla Atak | CF Steering Wheel Previous: 2018 ZL1 1LE M6 | 2017 Z06 Z07 M7 | 2017 GS A8 | 2015 ZL1 M6 | 2013 GT500 |
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