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rattling noise whenever i tried to go over 3000 rpm

10210 Views 15 Replies 12 Participants Last post by  StevenDriscoll
hi..
i get rattling noise whenever i tried to go over 3000 rpm mark.....everything is quite till 2900rpm then...the noise comes from the engine (?)...

once i go over 3000...the noise stops..

this is quite annoying...did anyone experience similar stuff??
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Just to clear something up

Hey guys,

So I see a lot of thought about the heat shields on the cats, and I think my car's configuration might clear a few things up.

My '04 is300 has Megan Racing headers installed (therefore, no cats or heat shields) and I also experience this weird knock at 3000 RPM.

As to what it actually is, I have no idea, but I'd love to figure it out!
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