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-   -   Continuesly Knocking.. (http://www.camaro5.com/forums/showthread.php?t=31625)

Stylish 07-09-2009 06:16 PM

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. :iono:

The 305 07-09-2009 11:14 PM

Stylish,

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

Not sure what to make of it...

Anyone?

camaro5 07-10-2009 02:41 AM

It's piston slap

http://www.camaro5.com/forums/showpo...25&postcount=2

The 305 07-10-2009 11:40 AM

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.

Stylish 07-10-2009 12:06 PM

Quote:

Originally Posted by The 305 (Post 665986)
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? :iono:

txaggie_08 07-10-2009 12:17 PM

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?

oachalon 07-10-2009 12:39 PM

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.

txaggie_08 07-10-2009 12:43 PM

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!!

shiftz33 07-10-2009 02:45 PM

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.

Robert@G-Force 07-10-2009 03:09 PM

Kind of common

http://pistonslap.com/

Stylish 07-10-2009 04:44 PM

If it is really a piston slap and common thing. Then all Camaros should have the same thing. Everyone agree?

CamaroSpike23 07-10-2009 05:07 PM

Quote:

Originally Posted by txaggie_08 (Post 666097)
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 (Post 666157)
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 :bs:
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.


Quote:

Originally Posted by Stylish (Post 667088)
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.

baileyrx 07-10-2009 05:22 PM

it might be the exhaust pipes heating up & expanding a bit...

camaro5 07-11-2009 05:16 PM

Have someone start the car while you listen underneath for location of the noise.

The 305 07-12-2009 05:07 PM

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.

camaro5 07-12-2009 06:17 PM

Good news...

I'd say you're right about a heat-shield heating up and expanding.

baileyrx 07-12-2009 06:49 PM

yeah, do I get a cookie?

djsnoflake 07-13-2009 03:15 AM

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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