Z/28 ticking sound - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

richard grimsley · 09-18-2018, 09:53 AM

I’m in curiosity if anyone on this thread has had this similar situation and or concern?

This Z has 14k miles, not tracked but, driven conservative since owned for the past month. It has no modifications to the car... All OEM. This morning when conducting a PMCS on the Z, once the engine was warm, I noticed a consistent ticking from the left side from exhaust primary cat area. I checked the exhaust extensively, resulted in no exhaust leak detected.

What are your thoughts?

Worried it may be a lifter, or is this normal?
thus still under warranty, rather concerned considering it’s my daily.

Your assistance would be greatly appreciated!

V/R

j o n · 09-18-2018, 10:10 AM

LS7's have loud valvetrain...between 2k-3k rpm it's most noticeable. Yes, sounds like exhaust leak, sewing machine, lifter tick... etc.

Numerous threads since 2006 on Corvette forums and on here too. Multiple trips from various people to the dealer to confirm if there is an issue with engine/exhaust. All but a handful ended with it being normal. Concern arises if tick is at idle and increases with rpm.

quickdrraw · 09-18-2018, 10:12 AM

I have got loud valvetrain noises too, more so than my LS3 SS for sure.

richard grimsley · 09-18-2018, 10:38 AM

Thank you tremendously for the feedback. Today was the first time I noticed this noise. The ticking is not noticeable from the engine bay and or valve cover but, merely heard outside of the vehicles right side once it is warm. It brought me to thoughts of concern considering it’s not the LS3 and I am new to the LS7 Z aspect.

V/R

hjdca · 09-18-2018, 12:16 PM

Quote:

Originally Posted by richard grimsley

Thank you tremendously for the feedback. Today was the first time I noticed this noise. The ticking is not noticeable from the engine bay and or valve cover but, merely heard outside of the vehicles right side once it is warm. It brought me to thoughts of concern considering it’s not the LS3 and I am new to the LS7 Z aspect.

V/R

I have 13K miles on mine also. I will listen today for ticking... but, if it is high pitched, forget it, my high pitch has been destroyed by rock & roll. lol.

1970judge · 09-18-2018, 12:49 PM

Quote:

Originally Posted by richard grimsley

Thank you tremendously for the feedback. Today was the first time I noticed this noise. The ticking is not noticeable from the engine bay and or valve cover but, merely heard outside of the vehicles right side once it is warm. It brought me to thoughts of concern considering it’s not the LS3 and I am new to the LS7 Z aspect.

V/R

Yep, same exact noise my car makes. Warm, cold, street, track..always has. Not a worry for me. In general LS7's are noisy engines, this car will always make random noises. The uniqueness of the car is a factor as well, noisy trans, noisy flywheel, no carpeting..etc. In short..faily common noise.

tylerio · 09-18-2018, 01:53 PM

Mine has been ticking for a long time. I have 20K miles. I've ignored it. So far, so good.

richard grimsley · 09-19-2018, 07:58 PM

I appreciate all of the responses and in put; however, this noise tapping/ knocking that I continue to notice has my all time attention resulting in excessive concern and drives me nuts. I will take this in to GM to have it looked at and keep you updated.

Thank you again...

V/R

D2M · 09-19-2018, 10:01 PM

Have them check the "Torca" clamps, the ones that clamp the butt joint between the cat pipes and cat back system. These clamps are great only when the pipes are perfectly round. In many cases the piped are slightly deformed and may pass a tiny amount through between the walls of the clamp/pipe. Also make sure the cat back is tightly butted up against the cat pipes. I use a ratchet strap to pull the exhaust foeward tight then tighten the clamp bolts. Over time things tend to shift a bit because of the cars stiff suspension and cornering ability.

OEM Torca clamp: double wall

I have ordered a cheaper single wall clamp hoping that it will conform to any kind of deformation in the pipes.

They should be here tomorrow I will report back in a few weeks to see if a leak develops with these clamps.

09-18-2018, 09:53 AM	#1
richard grimsley GRIM Drives: 2015 Camaro Z/28 Join Date: May 2010 Location: Marlton, NJ. Posts: 158	Z/28 ticking sound I’m in curiosity if anyone on this thread has had this similar situation and or concern? This Z has 14k miles, not tracked but, driven conservative since owned for the past month. It has no modifications to the car... All OEM. This morning when conducting a PMCS on the Z, once the engine was warm, I noticed a consistent ticking from the left side from exhaust primary cat area. I checked the exhaust extensively, resulted in no exhaust leak detected. What are your thoughts? Worried it may be a lifter, or is this normal? thus still under warranty, rather concerned considering it’s my daily. Your assistance would be greatly appreciated! V/R

09-18-2018, 10:10 AM	#2
j o n Drives: 2015 Z/28 #0058 Join Date: Apr 2018 Location: Pittsburgh, PA Posts: 814	LS7's have loud valvetrain...between 2k-3k rpm it's most noticeable. Yes, sounds like exhaust leak, sewing machine, lifter tick... etc. Numerous threads since 2006 on Corvette forums and on here too. Multiple trips from various people to the dealer to confirm if there is an issue with engine/exhaust. All but a handful ended with it being normal. Concern arises if tick is at idle and increases with rpm. __________________ Current: - '15 Z/28 #0058 \| White \| A/C \| Speakers \| Michelin PS4S 305/30/19's - '22 Ridgeline RTL \| White \| Ebony, '22 CR-V EX-L Hybrid \| White \| Ebony Sold: - '15 Z/28 #0048 \| White \| A/C \| Speakers \| Michelin PS4S 305/30/19's https://www.instagram.com/__jon__athan__/ Last edited by j o n; 09-18-2018 at 10:29 AM.

09-18-2018, 10:12 AM	#3
quickdrraw Drives: 2015 Z/28 Join Date: Nov 2012 Location: Oregon Posts: 213 View My Garage	I have got loud valvetrain noises too, more so than my LS3 SS for sure. __________________ 2015 Camaro Z/28 Black Sold: 2010 Camaro 1SS/RS

09-18-2018, 10:38 AM	#4
richard grimsley GRIM Drives: 2015 Camaro Z/28 Join Date: May 2010 Location: Marlton, NJ. Posts: 158	Z/28 ticking Thank you tremendously for the feedback. Today was the first time I noticed this noise. The ticking is not noticeable from the engine bay and or valve cover but, merely heard outside of the vehicles right side once it is warm. It brought me to thoughts of concern considering it’s not the LS3 and I am new to the LS7 Z aspect. V/R

09-18-2018, 01:53 PM	#7
tylerio EXTREMZ Drives: 2015 Z/28 #891, 2012 2SS 45th Anni Join Date: Jul 2012 Location: Southern Utah Posts: 131	Mine has been ticking for a long time. I have 20K miles. I've ignored it. So far, so good. __________________ ARH long tube headers, no cats Comp Cams stage 2 custom grind Ported throttle body JPSS Oil cooler JPSS SAI plates JPSS Rear sway bar Forza Continenti exhaust controller ZL1 Add-ons wickerbill Brey-Krause Harness bar Schroth 4 pt. ASM harnesses Auto-blip

09-19-2018, 07:58 PM	#8
richard grimsley GRIM Drives: 2015 Camaro Z/28 Join Date: May 2010 Location: Marlton, NJ. Posts: 158	I appreciate all of the responses and in put; however, this noise tapping/ knocking that I continue to notice has my all time attention resulting in excessive concern and drives me nuts. I will take this in to GM to have it looked at and keep you updated. Thank you again... V/R

09-19-2018, 10:01 PM	#9
D2M Drives: Z/28 Join Date: Oct 2015 Location: NJ Posts: 538	Have them check the "Torca" clamps, the ones that clamp the butt joint between the cat pipes and cat back system. These clamps are great only when the pipes are perfectly round. In many cases the piped are slightly deformed and may pass a tiny amount through between the walls of the clamp/pipe. Also make sure the cat back is tightly butted up against the cat pipes. I use a ratchet strap to pull the exhaust foeward tight then tighten the clamp bolts. Over time things tend to shift a bit because of the cars stiff suspension and cornering ability. OEM Torca clamp: double wall I have ordered a cheaper single wall clamp hoping that it will conform to any kind of deformation in the pipes. They should be here tomorrow I will report back in a few weeks to see if a leak develops with these clamps.