New highpitched whoosh sound
21 October 2006, 08:01 PM
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New highpitched whoosh sound
So yesterday my classic started to produce a very fainted high pitched whistling sound. At first I thought it was a police car some distance away, because that's exactly what it sounds like - A police siren that it miles away - It's really faint and it connected to throttle action.
However, it doesn't do it when the car is standing still, only when moving, and above 2.5K - so it must be turbo related. You only notice it when driving sedatly - the turbo whine and engine noise comes of the top of it and drowns it out once you put your foot down.
I don't have a boost guage, so I don't know if I am losing any pressure - And I haven't noticed a drop in performance. It's booked in with Len at subaru4you in a couple of weeks, so I'll ask him about it when I am up there. It's definitely coming from the drivers side
In the meantime, any ideas?
However, it doesn't do it when the car is standing still, only when moving, and above 2.5K - so it must be turbo related. You only notice it when driving sedatly - the turbo whine and engine noise comes of the top of it and drowns it out once you put your foot down.
I don't have a boost guage, so I don't know if I am losing any pressure - And I haven't noticed a drop in performance. It's booked in with Len at subaru4you in a couple of weeks, so I'll ask him about it when I am up there. It's definitely coming from the drivers side
In the meantime, any ideas?
Last edited by PeteBrant; 23 October 2006 at 01:21 PM.
21 October 2006, 09:12 PM
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Originally Posted by M555JHE
sounds like a split boost pipe or maybe a pipe come off the manifold somewhere?
22 October 2006, 11:21 PM
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It's a MY98 - No, boost is normal. It only started doing it Friday. Am now paranoid - as I am sure there is a high pitched whislte coming in just before the turbo spools up too - I can control the pitch of both noises with my right foot.
Can make some nice tunes, but I really would rather not to be able to
Can make some nice tunes, but I really would rather not to be able to
22 October 2006, 11:36 PM
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Did a search and found this post...
https://www.scoobynet.com/drivetrain...hlight=whistle
I do hope my turbo isn't going to give up on me 
https://www.scoobynet.com/drivetrain...hlight=whistle
when turbos are worn they tend to sound like a police siren and you think they are behind you with the sirens going.
and johnfelstead i take it then you've removed turbos from imprezas it's not a quick job and i could understand a couple of days to remove considering there will be other jobs booked in. but what i dont understand is if it's covered by the warranty still why dont they just replace it we would coz it saves so much time.
and johnfelstead i take it then you've removed turbos from imprezas it's not a quick job and i could understand a couple of days to remove considering there will be other jobs booked in. but what i dont understand is if it's covered by the warranty still why dont they just replace it we would coz it saves so much time.
23 October 2006, 12:47 PM
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Argh. Just spoken to Len @ Subaru4you - From my description is does indeed sound like a turbo on its way out.
Now I just need to convince the warranty company to give me a replacement without it actually failing first.
Now I just need to convince the warranty company to give me a replacement without it actually failing first.
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23 October 2006, 01:21 PM
#8
Rule out the easy/cheap things first.
The MY97/98 cars have a plastic recirc valve that is prone to failure.
It cracks open too early , resulting in a high pitch "moo" or like blowing over the top of a bottle, when on boost from about 2500 - 3500 rpm.
Nick
The MY97/98 cars have a plastic recirc valve that is prone to failure.
It cracks open too early , resulting in a high pitch "moo" or like blowing over the top of a bottle, when on boost from about 2500 - 3500 rpm.
Nick
23 October 2006, 01:57 PM
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Oh I am sure that Len will check the cheaper options first. But thanks for the tip.
Imagine for one second I am a lay man, and have no idea where the recirc valve is, or what it looks like, or how I would tell if it's cracked. What would you tell me to do?
Imagine for one second I am a lay man, and have no idea where the recirc valve is, or what it looks like, or how I would tell if it's cracked. What would you tell me to do?
23 October 2006, 03:15 PM
#10
I've had similar noise and i think it turned out to be large hose from intercooler to manifold not sealing properly.
Again I didn't seem to be loosing performance, but under boost conditions you'll only need a tiny leak to make a noise.
My noise was only on boost though. I thought it was turbo, but turrned out (I think) to be the cheap easy option.
Check all hoses and clips are tight etc... fingers crossed M8
Again I didn't seem to be loosing performance, but under boost conditions you'll only need a tiny leak to make a noise.
My noise was only on boost though. I thought it was turbo, but turrned out (I think) to be the cheap easy option.
Check all hoses and clips are tight etc... fingers crossed M8
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