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Old 07-09-2009, 05:16 PM   #1
Stylish
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Unhappy Continuesly Knocking..

I heared some continuesly knocking only when the car is cold after a while from starting my car. I believe it came from the back side.
I hear it everytime after starting the car in morning. Let's say after 5 mins from starting the car.
After that I don't hear it. Its only in the morning when that car is cold.

Could it be the battery problem? But I am sure that the pulled my car and has been delayed to get it because of the recall thing.

So I don't know really.
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Old 07-09-2009, 10:14 PM   #2
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Stylish,

Mine does the same damn thing. As you explained it exactly.

Not sure what to make of it...

Anyone?
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Old 07-10-2009, 01:41 AM   #3
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It's piston slap

http://www.camaro5.com/forums/showpo...25&postcount=2
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Old 07-10-2009, 10:40 AM   #4
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Okay so now what? If I take it in are they going to tell me to hall @ss? Honestly it doesn't sound like it's coming from the engine though...

I will pay more attention next time.

Thanks for the info.
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Old 07-10-2009, 11:06 AM   #5
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Okay so now what? If I take it in are they going to tell me to hall @ss? Honestly it doesn't sound like it's coming from the engine though...

I will pay more attention next time.

Thanks for the info.
You are right, It doesn't sound it's coming from the engine.

It seems it from the back side of the car. I have a doubt with a battery because it is in the back trunk.
The confusion that I know my car have been pulled back to the plant to fix the recall thing and I believe they did the batter case. What else could it be?
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Old 07-10-2009, 11:17 AM   #6
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Is piston slap a common problem in GM cars? I've only owned one other Chevy in my life, and it didn't have the problem. Is this a serious issue with the cars that GM will not fix or what?
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Old 07-10-2009, 11:39 AM   #7
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gms newer engines dont have piston slap problems anymore. i would say 05 and up seem to be fixed of those problems.

Piston slap doesnt cause any harm if you do have it.
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Old 07-10-2009, 11:43 AM   #8
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Quote:
gms newer engines dont have piston slap problems anymore. i would say 05 and up seem to be fixed of those problems.

Piston slap doesnt cause any harm if you do have it.
Thanks for the input oachalon!!
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Old 07-10-2009, 01:45 PM   #9
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My former 2005 Chevy SSR with the 6.0L LS2 engine had a bad case of piston slap. It was considered "normal" and GM would not fix it since they did not consider it a problem.
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Old 07-10-2009, 02:09 PM   #10
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Kind of common

http://pistonslap.com/
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Old 07-10-2009, 03:44 PM   #11
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If it is really a piston slap and common thing. Then all Camaros should have the same thing. Everyone agree?
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Old 07-10-2009, 04:07 PM   #12
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Quote:
Originally Posted by txaggie_08 View Post
Is piston slap a common problem in GM cars? I've only owned one other Chevy in my life, and it didn't have the problem. Is this a serious issue with the cars that GM will not fix or what?
when the LS1 first debuted, excessive piston slap was an everyday occurance for most owners. partly because the pistons werent matched to the cyl bores in each engine. its not a serious issue. it is annoying, but as long as you arent running 6000rpm all day long right off the start, you wont have to worry about it.

Quote:
Originally Posted by oachalon View Post
gms newer engines dont have piston slap problems anymore. i would say 05 and up seem to be fixed of those problems.

Piston slap doesnt cause any harm if you do have it.

piston slap still occurs. nearly every motor out there has some piston slap. what you need to look out for is excessive piston slap

as far as it not causing harm? thats
99.9999999999999999% of owners that do have piston slap will never have a problem (save for the annoying noise), but piston slap can be a big problem.
however, it usually takes a long time for any significant damage to occur.


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If it is really a piston slap and common thing. Then all Camaros should have the same thing. Everyone agree?
piston slap happens in nearly every motor out there. however, some motors will have more than others.
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Old 07-10-2009, 04:22 PM   #13
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it might be the exhaust pipes heating up & expanding a bit...
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Old 07-11-2009, 04:16 PM   #14
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Have someone start the car while you listen underneath for location of the noise.
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Old 07-12-2009, 04:07 PM   #15
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Thanks for all the inputs. It is definitely NOT coming from the engine after verifying and paying attention. The noise does happen but it seems more like crackling from the mufflers or a heat shield or something....it happens after warming up and then I never hear it again.
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Old 07-12-2009, 05:17 PM   #16
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Good news...

I'd say you're right about a heat-shield heating up and expanding.
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Old 07-12-2009, 05:49 PM   #17
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yeah, do I get a cookie?
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Old 07-13-2009, 02:15 AM   #18
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If you hear it from the rear of your car and it sounds like someone knocking on a door, it is your fuel system pressurizing.

Helps fuel ecomomy and blah blah blah. There was a thread about it a while back.

You say it sounds like the noise comes from the rear, and last time I checked, the pistons were in the front.


EDIT: Here's the thread: http://www.camaro5.com/forums/showthread.php?t=26900

Read post #11, it's from the Fbodfather himself
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