rattling noise within the head(S13)

[JXN]

When i first bought my 240, I have heard this noise coming from the engine compartment. Its a rattling noise which you can only hear when its idling(cuz it would be too loud to hear when you apply throttle). I know its coming from within the engine cuz I removed the oil cap while idling, and heard the noise clearer. At first someone told me it was valve clearance, but I did some reseach and figured that KA24DE dont have adjustments for valve clearance. So it couldnt be that.

I have heard the noise on other S13s(DOHC)....it seems im not the only one. Who knows what Im talking about? Is it even a problem?

[s13sr20chris]

pull the valve cover off and check for loose bolts or a broke chain guide in the front.