KNOCK KNOCK...Engine Knocking

[Jerka]

Hey...I thought I heard a little knock this morning while I was sitting at a stop light.  I've never heard knock before, but I've heard it sounds like a marble rattling in a coke can...and thats what I heard this morning.  I'm just wondering what causes it and how to fix it.  I have been using regular gas...should I up the octane and start buying premium?  Any ideas???  Thanks.

[dgyver]

Knocking due to low octane is only noticable under load and acceleration.

Cams have been known to knock, especially on the 04+ due to lack of proper spacers.

Tank to frame vibrations are possible as well. Common on those without the trim strip on the bottom edge of the tank.

[gsJack]

Low frequency or high frequency knock?

If it sounds like this one from yesterday it could be the harmless camshaft end play knock which started long before the 04 models:

http://gstwins.com/gsboard/index.php?topic=41559.msg467375#msg467375

[Jerka]

Thanks Jack ...that sounds like my knock.  I'll keep an eye...or an ear...on it for awhile and let you know if I can pinpoint it.

[ohgood]

nah, that just means the gs is running.

you'll get used to the assorted rattles and noises pretty soon now