chakko

Hey there

my 02 sti makes some strange rattle or knocking noise when i get around 3800-4200rpm. Sometimes the sound stays to higher rpm.

Sounds somehow like a rod knock to me but it is only to hear a the engine goes to the written rpm. When the car is standing still i just can reproduce it sometimes a little bit when i floor the gas a few times.

Anyone a idea what that could be?

siluro

The belt tensioner can make a knocking noise if duff. Bit like rod knock as it happens. Hope it is for you.

chakko

I thought about the tensioner but if it's broken, wouldn't make it a sound/knock all the time even in idle?

ossett2k2

iTrader: (9)

Could be a lot of things tbh.
get a sound/vid clip up,might help?
rod knock is more noticeable at that rpm and more when lifting off.

chakko

No sorry, I don't have any media. I tryed to make a clip but it's nothing to hear because of the other noise like wind etc.

Maybe I can put a GoPro under the hood and try it again but atm the car is in the garage waiting to get the trunk painted.

Your last sentence makes me nervous because I can hear it best when accelerating to ~4000rpm and the change gear/lift the gas....

Btw sorry for my bad english!

ossett2k2

iTrader: (9)

Loose exhaust shield
loose spark plug
up pipe or exhaust gasket
intake manifold gasket
valve lash out

The list goes on really...

check everything you can and I would drop the oil and check it for bits of metal.

johned

Good info there.