Engine Knock - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

txferrari · 10-16-2014, 09:43 PM

I have 1100 miles on my 14 Zl1. I've run nothing but 93 Premium and I still get crazy engine knock under hard acceleration. It has seemed to get worse. I usually run Shell gas btw. Just wondering what was up or if it's normal.

Thanks.

nxttruck2002 · 10-16-2014, 09:57 PM

I always fill 93 in my '14 ZL1 and I don't experience what you're saying. I also filled up in Katy last week visiting friends. Get HPtuners and log a couple WOT pulls.

Camero5 · 10-16-2014, 09:57 PM

Quote:

Originally Posted by txferrari

I have 1100 miles on my 14 Zl1. I've run nothing but 93 Premium and I still get crazy engine knock under hard acceleration. It has seemed to get worse. I usually run Shell gas btw. Just wondering what was up or if it's normal.

Thanks.

I get engine knock with shell almost always. Not sure why as I always thought shell 93 would be great. Since then I've been using chevron exclusively with no issues. I've been hesitant to try other places.

Get a bottle of torco and see if that helps with the issue at all. It always helps when I run into that issue.

Camero5 · 10-16-2014, 09:58 PM

Other thing, since your in TX, hit up a local shop and see if they can help with a data log and check something else is causing it.

Logan1234 · 10-16-2014, 11:00 PM

Quote:

Originally Posted by txferrari

I have 1100 miles on my 14 Zl1. I've run nothing but 93 Premium and I still get crazy engine knock under hard acceleration. It has seemed to get worse. I usually run Shell gas btw. Just wondering what was up or if it's normal.

Thanks.

There are several gas stations in the Houston area that have been busted for selling lower octane than advertised; one even tested lower out of the 93 pump than out of the 87 pump.

scdrj · 10-17-2014, 01:46 AM

I have bought 94 from a Shell station in north TX, it acted like 91. I say that because I have run lots of 91 and good 93.

X25 · 10-17-2014, 05:35 AM

Indeed, Shell is known to have very poor performance in other forced induction communities like Subaru STI, EvoX, etc. Unfortunately, the fact that it has got quality detergents does not mean it has high octane.

Z/28Dan · 10-17-2014, 06:22 AM

Bring it to the dealer and get it checked under warranty. Something isn't right.

ZO6 Bryan · 10-17-2014, 07:26 AM

Quote:

Originally Posted by ZL1Dan

Bring it to the dealer and get it checked under warranty. Something isn't right.

Ditto. Even if you get some bad gas the PCM will adjust and you won't hear any audible knock. Something is wrong. Unless you have had it tuned and they turned off knock retard. Either way you'll damage you engine if you keep rattling the pistons like that.

txferrari · 10-17-2014, 07:32 AM

Quote:

Originally Posted by ZO6 Bryan

Ditto. Even if you get some bad gas the PCM will adjust and you won't hear any audible knock. Something is wrong. Unless you have had it tuned and they turned off knock retard. Either way you'll damage you engine if you keep rattling the pistons like that.

No tune, just a CAI. I'll get it in to the service dept. Thanks for the answers guys.

ZO6 Bryan · 10-17-2014, 07:50 AM

Quote:

Originally Posted by txferrari

No tune, just a CAI. I'll get it in to the service dept. Thanks for the answers guys.

Which CAI? Did the problem start when you installed that? You may have leaned out the AFR so much it is knocking. May as well put the stock one back on because that is the first thing the dealer will want to do.

txferrari · 10-17-2014, 09:03 AM

Quote:

Originally Posted by ZO6 Bryan

Which CAI? Did the problem start when you installed that? You may have leaned out the AFR so much it is knocking. May as well put the stock one back on because that is the first thing the dealer will want to do.

RotoFab. And no, not right away. I put the RotoFab on at about 500 miles. Btw, I have 1800 miles. Not 1100 as stated above. Shoot, my mileage is getting up there. haha. It started prob about 2 tanks ago. It seems to be bad once motor is nice and toasty. Got on it this morning on the way to drop my son to school and no knock. I'm going to try Chevron premium with an enhancer and if it's still doing that, off to service. But I hear what you are saying. Btw, I haven't put anything in the car but 93 Octane. (Well, according to Shell it's 93). But like said above, it could be Shell. And here I thought Shell was one of the top brands.

Kevlar382 · 10-17-2014, 09:52 AM

Try the fuse pull. 5 and 20. never know it might help, nothing to lose anyway

toyosuprablue · 10-17-2014, 10:20 AM

Quote:

Originally Posted by Kevlar382

Try the fuse pull. 5 and 20. never know it might help, nothing to lose anyway

This has fixed other cars in the past. The computer gets latched on to a lower octane fuel map if/ when lower octane fuel is used. Reset these two fuses after you have fuel you know to be good in the tank.

10-16-2014, 09:43 PM	#1
txferrari Drives: 2016 Z06/7. Join Date: Aug 2014 Location: Katy Posts: 309	Engine Knock I have 1100 miles on my 14 Zl1. I've run nothing but 93 Premium and I still get crazy engine knock under hard acceleration. It has seemed to get worse. I usually run Shell gas btw. Just wondering what was up or if it's normal. Thanks. __________________ There's only 2 people I trust. One of them is me, the others not you.

10-16-2014, 09:58 PM	#4
Camero5 Hide! My wife's coming! Drives: 2013 Chevrolet Camaro ZL1 Join Date: Jun 2011 Location: Las Colinas, TX Posts: 1,442 View My Garage	Other thing, since your in TX, hit up a local shop and see if they can help with a data log and check something else is causing it. __________________ 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

10-17-2014, 05:35 AM	#7
X25 Drives: '16 C7 Z51 Join Date: May 2012 Location: Redmond, WA Posts: 3,056	Indeed, Shell is known to have very poor performance in other forced induction communities like Subaru STI, EvoX, etc. Unfortunately, the fact that it has got quality detergents does not mean it has high octane. __________________ '16 Corvette C7 Z51 1LT (Build Thread) '14 AGM 1SS 1LE [COTW 11/17/14] (Build Thread) (SOLD) '13 Mazda MX-5 Club (Build Thread) '17 RAM 1500 Crew Cab 4x4 Night Edition '15 Nissan Rogue S AWD

10-17-2014, 06:22 AM	#8
Z/28Dan Drives: 2013 HWSE Indy Festial #26 Join Date: Mar 2011 Location: Fredericksburg, VA Posts: 2,670 View My Garage	Bring it to the dealer and get it checked under warranty. Something isn't right. __________________ There are only so many days in your lifetime. So get out and drive your Camaro... Dan

10-16-2014, 09:57 PM	#2
nxttruck2002 Drives: Camaro Join Date: Aug 2013 Location: Cali Posts: 200	I always fill 93 in my '14 ZL1 and I don't experience what you're saying. I also filled up in Katy last week visiting friends. Get HPtuners and log a couple WOT pulls.

10-17-2014, 01:46 AM	#6
scdrj Drives: 2014 ZL-1 Join Date: Feb 2014 Location: In front of a computer. Posts: 210	I have bought 94 from a Shell station in north TX, it acted like 91. I say that because I have run lots of 91 and good 93.

10-17-2014, 09:52 AM	#13
Kevlar382 Drives: '12 ZL1; '71 RS/Z28; '99 Vette Conv Join Date: Feb 2012 Location: Holland MI Posts: 599 View My Garage	Try the fuse pull. 5 and 20. never know it might help, nothing to lose anyway