truxx

I'm convinced it's wastegate flutter but could be worng. I've read a few horror stories about adjusting the wastegate arm is there a guide somewhere on how it should be done? Could it be checked using diagnostics on live data to make sure it is that ? I noticed a few weeks ago when i was looking at the wastegate that the arm was quite loose, i was able to move it fairly easy ?(engine off) but not with engine on..(edit) Just checked again and i can't move it with engine off lol so ignore this bit haha. Yeah the secondary air system seems to be working fine, stan palmer (subaru carlisle) replaced the pump and the 2 selanoids (£2k) so im sure it's all good but i will check that anyway. Thanks for taking the time i do appreciate it... Dave

Could be similar. I have got a video somewhere of the noise i'll post it up if i find it.. Wouldnt there be a cel light on for that ? Any other way of knowing ? I've had to take the car off the road now as i'm worried it's causing more damage driving it with the fault so any suggestions of things worth testing would be greatly appreciated. I know a remap would probably fix it but that's £500 i don't have :( Thanks Dave

Thanks for the reply... Yeah i've read a lot and no one ever seems to fix it. I don't want to go wasting money on parts unless i know for sure there no good. Yep comp test was from stone cold. When i first bought the car (6 months ago) it had this fault and cel light and was diagnosed by dealer as secondary air system so they replaced all that at big ££ still no different but no more cel. Then i found the intake pipe to turbo had been split by the jubilee clip so dealer replaced that and still no good. So the dealer then sent the car to some subaru god on the scottish boarders and they diagnosed it as bad plugs. So i got car back to find it still have similar fault just a bit different (worse). Then cel light came back on pointing to the knock sensor so replaced that, still no different. so i thought i'd change plugs myself (to be sure) and found the subaru god had fitted the shorter plugs from the 2.0 wrx haha. I did the compression test at the same time as fitting correct plugs but now im back to the original problem... there is a strange noise before it gets boost like an air fluttering? noise. It sounds as though wastegate is opening and closing then once it hits boost the sound goes away and engine runs great? The hesitation as within the same rpm range as the noise. Btw it's been to 2 different main subaru dealers and the scottish guy and nothing was mentioned about the noise so it could be normal ? My old classic wrx never did it. By air leaks do you mean in the boost system or vac ? i've visually inspected both and all seems good. Boost hits 13psi as it should... Thanks for the replies

Hi Since buying my wrx it's had a hesitation at low rpm before boost.It's a little worse when cold but always there regardless. It does this anytime i'm below 3k rpm once passed that it usually revs through pretty clean. So i changed the plugs and no difference. Changed the knock sensor as the light come on for that not long after changing plugs.Still no different. Done a compression test and got 110 psi on all 4 cylinders which i'm assuming is ok ? Any ideas what else i should check ? Car is an 07 2.5 wrx (hawkeye) only mod is cat back ninja 2 exhaust everything else is standard, 56k miles with full subaru service history. No knocks or rattles no smoke and no leaks. Thanks Dave