My Sti7 with PPP and no other performance mods (23000 miles) has just started making a weird resonance sounding noise at 4000-4250 rpm both on acceleration and de-acceleration through that band. The car still makes the noise out of gear? Anyone got a foggiest what it might be?

 

Exhaust catching anywhere?

 

Not that I can tell :-(

 

Actually I forgot to mention, it may be in my mind, or could be the hotter weather but the car has seemed to be little less powerful over the last 2 weeks

 

It's going to be less powerful in this weather, yes.

 

resonance = heatshield, one of the many.

car will be slower in this weather, needs cool damp air for best performance...

 

I thought about the heat shield but discounted it due to it being such a narrow rev band. The noise has gone once you hit 4.5K rpm.

[Edited by pmather - 7/25/2003 5:14:26 PM]

 

I,ve got exactly the same problem with mine it comes in at about 3000 rpm and goes at 500 rpm later - it seems to be coming from the right hand side of the dash but not sure - will watch this post to see how you go on.

Ian

 

Ian is yours PPP'd?

 

I used to have the same problem but at 2500 RPM. It was the heat shield.

Les

 

I get a rattle on my 03 WRX at about 2.5 to 3k revs. Other threads on here reckon it may be a solenoid. I think the turbo on yours comes on later so maybe it is this??

Have a search.

Cheers

Dave

 

Use to happen on older imprezas when the brake pipes were vibrating against the bulkhead, probably been fixed if they are new 02s and 03s.