engine is making noise over 6k rpm help!!!

[E91cpe]

i posted a few days ago about a problem i had where my 91 240sx was making a strange rattling noise at high rpm some people said it could be the timing chain or guides i removed the guides and was very pleased that my engine no longer knocked at idle but i'm still getting noise at high rpm. if i stab the throttle in first gear it runs perfectly until around 6k rpm and then i get a loud rattle if a shift and stab the throttle again it stops until high rpm again. otherwise car drives fine under normal load and daily driving. the only thing else i can think of that may cause this could possibly be the knock sensor.... has anyone had this problem or know anything about it help would be greatly appreciated.... i have no cel's and the car is 100% stock

[onosqv]

don't rev it over 6k...

what about 2nd gear? 3rd gear?

is the noise the same regardless of load (i.e. full throttle or part throttle) @ 6k?

the rattling noise doesn't sound like little metal balls in a tin can does it? you probably want to be more specific in describing the noise - or if you can record it, even better - cars make lots of different rattling noises.

[E91cpe]

partial throttle full throttle does not make a diff it just always does it at high rpm

[RubyRed240]

considering that is so near redline I would assume you are expecting too much of your car's engine...that or something's wrong with it... but at 6k... I think it's just the strain that you're hearing...

[timster]

dood its a ka there is no need to go past 6k. if u do it on the regualr expect it to go kaboom

+1 in stock trim from my experience the engines don't like to go above 6k. The noise sort of undoes me.

What's up Jay haha.

[nissanman04]

Since this is happening at the same rpm all time, it's probably just a resonance issue, like a heat shield rattling or something.

[dgms240]

+1!! ka's don't rev that high with out mods.ps. they dont make any power in stock form past 5600 rpm (valve float)