Noise when I start the car - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Bradyd24 · 02-16-2011, 01:57 PM

My car spends most of the time stored in the garage, only have 1450 miles on her. I start her every three weeks or so and when I do I hear a clunk sound (Sounds like I dropped a hammer on the floor). It does it once and then runs fine (noise free) and no loss of power. It only does after sitting for extending periods time, does not do it when starting consecutive days or weekly. Dealer can't get it to duplicate and says it has no idea. Any idea? Is this something I should worry about?

Thanks in advance for your help!

JayhawkSS · 02-16-2011, 01:58 PM

Where is the sound coming from?

Bradyd24 · 02-16-2011, 02:04 PM

Under the hood.

JayhawkSS · 02-16-2011, 02:09 PM

Not sure.

I have had a bumping sound toward the back every once and awhile. Dealer told me that it was the ABS recalibrating. Your thing sounds like it's something that should be fixed.

louiecvt · 02-16-2011, 02:15 PM

it's the sound of the rat in your engine compartment that's been nesting while your car has been siting.

chevyboy221 · 02-16-2011, 02:47 PM

is the a/c is left on? sometimes when it engadges the a/c clutch after it has sat for awhile it can make a thump type noise due to oil built up on the comp. head.. if that makes since to you

Shu71 · 02-16-2011, 04:26 PM

Is it the starter disenganging and clunking?

Tigg · 02-16-2011, 05:46 PM

it is the A/C unit ..even if your ac unit is not on it will cycle to keep the seals from drying out... Why it bangs like that i don't really know but I have had many GM vehicles over the years and they all have done it..Your ok bro..

not to worry

CamaroC-17 · 02-16-2011, 05:57 PM

Is it the clunk you hear when you shut off the car..which is the clutch releasing. Is it that clunk?

Sneeks20 · 02-16-2011, 09:21 PM

Quote:

Originally Posted by Tigg

it is the A/C unit ..even if your ac unit is not on it will cycle to keep the seals from drying out... Why it bangs like that i don't really know but I have had many GM vehicles over the years and they all have done it..Your ok bro..

not to worry

I get the same clunk after i let my car sit for about 3 days or more. I was going to ask but OP beat me to it. If its normal then thats a relief.

Shu71 · 02-17-2011, 09:57 AM

I have been driving GM products for about 25 years and never had the A/C compressor do this after extended periods of sitting.

Are your vehicles manual transmissions? Is the clutch disk sticking to the flywheel a little during startup? Maybe try to push the clutch in and then release it quickly a few time to make sure the disk is disengaging from the flywheel and see if that cures it.

Chevrolet Customer Svc · 02-25-2011, 01:20 PM

For those experienceing this issue, I would like to direct message you about this issue simply to gather some information to make sure I do what I can to assist you. Thank you for your time.

Jeff Morris, Chevrolet Customer Service

Shu71 · 02-25-2011, 01:51 PM

Quote:

Originally Posted by Chevrolet Customer Svc

For those experienceing this issue, I would like to direct message you about this issue simply to gather some information to make sure I do what I can to assist you. Thank you for your time.

Jeff Morris, Chevrolet Customer Service

What? Is there a known issue?

2010 Bumblebee · 02-25-2011, 03:04 PM

Mine is noisy after sitting and then starting , but that's the AFM lifters.. The A/C theory sounds like a good one..

02-16-2011, 01:57 PM	#1
Bradyd24 Drives: 2010 IOM 2SS/RS, 2012 45th Vert. Join Date: Dec 2009 Location: Abilene Tx Posts: 36	Noise when I start the car My car spends most of the time stored in the garage, only have 1450 miles on her. I start her every three weeks or so and when I do I hear a clunk sound (Sounds like I dropped a hammer on the floor). It does it once and then runs fine (noise free) and no loss of power. It only does after sitting for extending periods time, does not do it when starting consecutive days or weekly. Dealer can't get it to duplicate and says it has no idea. Any idea? Is this something I should worry about? Thanks in advance for your help!

02-16-2011, 01:58 PM	#2
JayhawkSS Autobot Drives: 2010 Camaro 2SS/RS Join Date: Jan 2009 Location: Overland Park, KS Posts: 253	Where is the sound coming from? __________________ 2010 Camaro 2SS/RS \| *Silver Ice Metallic* LS3..Black Leather..Sunroof - Delivered! 06/27/2009 ROCK CHALK!!!

02-16-2011, 02:09 PM	#4
JayhawkSS Autobot Drives: 2010 Camaro 2SS/RS Join Date: Jan 2009 Location: Overland Park, KS Posts: 253	Not sure. I have had a bumping sound toward the back every once and awhile. Dealer told me that it was the ABS recalibrating. Your thing sounds like it's something that should be fixed. __________________ 2010 Camaro 2SS/RS \| *Silver Ice Metallic* LS3..Black Leather..Sunroof - Delivered! 06/27/2009 ROCK CHALK!!!

02-16-2011, 05:46 PM	#8
Tigg Irreverent Schmoe Drives: Black 2010 2SS Join Date: Apr 2010 Location: pennsylvania Posts: 366	it is the A/C unit ..even if your ac unit is not on it will cycle to keep the seals from drying out... Why it bangs like that i don't really know but I have had many GM vehicles over the years and they all have done it..Your ok bro.. not to worry __________________ Black 2SS,M6,Sunroof,R6P.11390

02-25-2011, 03:04 PM	#14
2010 Bumblebee Drives: Transformers Edition Camaro 2SS/RS Join Date: Jan 2010 Location: Mass Posts: 1,048 View My Garage	Mine is noisy after sitting and then starting , but that's the AFM lifters.. The A/C theory sounds like a good one.. __________________ The Yellow Camaro Club http://www.camaro5.com/forums/group.php?groupid=128 Northern Massachusetts & Southern New Hampshire Camaro Club http://www.camaro5.com/forums/group.php?groupid=127 The mother of all supercharger questions thread http://www.camaro5.com/forums/showthread.php?t=77958 My 2010 Camaro Review http://www.camaro5.com/forums/showthread.php?p=2025442#post2025442 2010 Transformer Edition Camaro L99 Auto

02-16-2011, 02:04 PM	#3
Bradyd24 Drives: 2010 IOM 2SS/RS, 2012 45th Vert. Join Date: Dec 2009 Location: Abilene Tx Posts: 36	Under the hood.

02-16-2011, 02:15 PM	#5
louiecvt Drives: 2018 Camaro ZL1 Join Date: Dec 2009 Location: Mckinney Posts: 116	it's the sound of the rat in your engine compartment that's been nesting while your car has been siting.

02-16-2011, 02:47 PM	#6
chevyboy221 Drives: 2015 SS L99 Join Date: Aug 2009 Location: Sarasota FL Posts: 67	is the a/c is left on? sometimes when it engadges the a/c clutch after it has sat for awhile it can make a thump type noise due to oil built up on the comp. head.. if that makes since to you

02-16-2011, 04:26 PM	#7
Shu71 Drives: 2011 Camaro RS M6 Join Date: Jan 2011 Location: Illinois Posts: 795	Is it the starter disenganging and clunking?

02-16-2011, 05:57 PM	#9
CamaroC-17 Formerly Camaroc5 Drives: 2010 Camaro LT/RS M6 Join Date: May 2010 Location: USA Posts: 1,647	Is it the clunk you hear when you shut off the car..which is the clutch releasing. Is it that clunk?

02-17-2011, 09:57 AM	#11
Shu71 Drives: 2011 Camaro RS M6 Join Date: Jan 2011 Location: Illinois Posts: 795	I have been driving GM products for about 25 years and never had the A/C compressor do this after extended periods of sitting. Are your vehicles manual transmissions? Is the clutch disk sticking to the flywheel a little during startup? Maybe try to push the clutch in and then release it quickly a few time to make sure the disk is disengaging from the flywheel and see if that cures it.

02-25-2011, 01:20 PM	#12
Chevrolet Customer Svc Drives: GM Vehicles Join Date: Jun 2010 Location: Michigan Posts: 9,328	For those experienceing this issue, I would like to direct message you about this issue simply to gather some information to make sure I do what I can to assist you. Thank you for your time. Jeff Morris, Chevrolet Customer Service

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Washing/Detailing for Newbies	MRK III Z28	Cosmetic Maintenance: Washing, Waxing, Detailing, Bodywork, Protection	125	02-05-2024 09:55 PM
Remote Start on an M6	djb525	5th Gen Camaro SS LS LT General Discussions	65	12-23-2013 10:47 AM
Drying after a rain?	KLow7777	Cosmetic Maintenance: Washing, Waxing, Detailing, Bodywork, Protection	7	02-17-2010 10:41 AM
Transmission output shaft	hiller72	Camaro Issues / Problems \| Warranty Discussions \| TSB and Recalls	267	12-02-2009 08:39 PM