Chatter above 3000 rpm

[suburboturbo]

I drive a 2004 WRX that's developed a chatter above 3,000 rpm. Sounds
vaguely like valve clatter, but is very muted, and only audible under
throttle. Since the turbo is spooling up and engaging right around
3,000, should I suspect a turbo problem, maybe a relief valve that's
opening when it shouldn't? Car is under extended Subaru factory
warranty and going back to the dealer next week. No other problem,
just curious as to what this might be so I can counter any BS the
service dept. might give me.

 

[Carl 1 Lucky Texan]

I drive a 2004 WRX that's developed a chatter above 3,000 rpm. Sounds
vaguely like valve clatter, but is very muted, and only audible under
throttle. Since the turbo is spooling up and engaging right around
3,000, should I suspect a turbo problem, maybe a relief valve that's
opening when it shouldn't? Car is under extended Subaru factory
warranty and going back to the dealer next week. No other problem,
just curious as to what this might be so I can counter any BS the
service dept. might give me.

Interesting. I suppose it's in all gears and in neutral?
I suppose it could be something esoteric like wastegate flutter w'ever,
dunno. Is it definetly underhood? Sometimes heat sheilds will rattle at
specific RPMs.

maybe our tech (Steve?) will respond. If not, try searching/posting at
www.nasioc.com or www.ultimatesubaru.org

Carl

 

[S.Hansen]

Interesting. I suppose it's in all gears and in neutral?
I suppose it could be something esoteric like wastegate flutter w'ever,
dunno. Is it definetly underhood? Sometimes heat sheilds will rattle at
specific RPMs.

maybe our tech (Steve?) will respond. If not, try searching/posting at
www.nasioc.com or www.ultimatesubaru.org

Carl

Try not to get too involved in noises without hearing them. Heat shields
would be my first look too.
Steve

 

[weelliott]

Try not to get too involved in noises without hearing them. Heat shields
would be my first look too.
Steve- Hide quoted text -

- Show quoted text -

My heat shield rattles from about 2900 to 3100. If it is at all engine
speeds over 3k, it probably isn't a heat shield. I've had three cars
(maxda MX-6, volvo 240DL, and subaru legacy) with heat shields that
have worked loose, and all of them only rattled in a narrow window of
engine speeds. Heat shield rattles are very common on subies though.

Bill