Whistle noise under power - Subaru Forester Owners Forum
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post #1 of 84 (permalink) Old 08-18-2009, 09:57 PM Thread Starter
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Whistle noise under power

I have a 2004 x forester. Recently purchased with 96,000 km. now 99000. Ever since we got it, it has been making a whistle/squeal sound under power, usually at 3,000 rpm and when I ease off the gas and the RPMs drop to the 2000's it stops. Any suggestions as where to look. I can't locate the area of the sound.

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post #2 of 84 (permalink) Old 08-19-2009, 06:44 AM
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I notice the hose clamps on the intake assembly loosen over time and I've heard a light whistle under throttle from that. Snugging up the clamps seems to fix it every time. Hope this helps.


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post #3 of 84 (permalink) Old 08-19-2009, 07:35 AM
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If you could get an approximate location of where the sound is coming from, it would help to figure out what's causing it.

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post #4 of 84 (permalink) Old 08-19-2009, 09:02 AM
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I've always had a whistling noise since I picked my Forester in February.
I've changed the rear diff fluid, will do the front this weekend, hoping it isn't that.

It only starts whistling while under load, not while in neutral or coasting or light acceleration under 3.5-4k. The intake is secured, too.

I can't really tell where mine is coming from either. I'm normally good at pinpointing noise, too, but damn, I'm not going to open the door on a street, stick my head under, and step on the gas. :P

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post #5 of 84 (permalink) Old 08-19-2009, 09:11 AM
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Dan, I have a whistling noise too that I can't pinpoint. You and I might need to meet up and ride under each other's hoods like this guy

YouTube - Renault Rally under the hood

:D

05 XS
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post #6 of 84 (permalink) Old 08-19-2009, 09:21 AM
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Oh man, that's too funny!
I'd be down for that! I just want that stupid noise gone.
Oh, and I'm getting close to my due date for having my timing belt done, so all tensioners and belts, pullies etc will be replaced. :D $$ :(

Quote:
Originally Posted by neoshi View Post
Dan, I have a whistling noise too that I can't pinpoint. You and I might need to meet up and ride under each other's hoods like this guy

YouTube - Renault Rally under the hood

:D

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post #7 of 84 (permalink) Old 08-19-2009, 09:35 AM
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Hmm I wonder if your whistling is just a hard spot on your belt then?

05 XS
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post #8 of 84 (permalink) Old 08-19-2009, 10:20 AM
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Hmmm, well there is no wigga wigga type noise, if you know what I mean, such as a hard spot being pressed on every revolution etc. It's a constant noise when under load.. it revs faster with the speed of the engine, and when under 4k or so, it's gone, and not an issue, and also during coasting.

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post #9 of 84 (permalink) Old 08-24-2009, 09:14 AM
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Quote:
Originally Posted by iac27 View Post
I have a 2004 x forester. Recently purchased with 96,000 km. now 99000. Ever since we got it, it has been making a whistle/squeal sound under power, usually at 3,000 rpm and when I ease off the gas and the RPMs drop to the 2000's it stops. Any suggestions as where to look. I can't locate the area of the sound.
Any update! did you find the source of noise? mine is having the same problem

2003 Forester 2.5X Auto
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post #10 of 84 (permalink) Old 08-25-2009, 08:57 AM Thread Starter
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no not yet. It's still bugging me! I haven't had much time to poke my head around yet. I'll keep you updated.

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post #11 of 84 (permalink) Old 09-06-2009, 08:27 PM
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I'm having my timing belt replaced this week. This Monday in Canada is labor day (tomorrow) and most places are closed. I'll get a booking on Tuesday to try to have it replaced this week (and as mentioned the tensioner, accessory belt, which I noticed now has some chunks missing.. which now makes the noise more prominent.

I'd guess a bad accessory belt will cause a whistling. When I get it around 3k+ now on the tach it whistles... and if I even goose it a little, I can hear the sound increase in pitch relative to the amount of acceleration applied.

I'll let you all know if it disappears with the timing belt replacement etc.


Anyone know what the usuals for a Forester are when replacing a timing belt? tensioner pulley, timing belt, belt itself, (my accessory belt is done, so that too).

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post #12 of 84 (permalink) Old 09-07-2009, 07:02 PM Thread Starter
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Thanks alot Dan, i'm looking forward to it!
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post #13 of 84 (permalink) Old 09-07-2009, 07:30 PM
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Quote:
Originally Posted by sa_lontoc View Post
Any update! did you find the source of noise? mine is having the same problem
Check out your accessory belt for wear. Mine's pretty much toast. It is missing chunks all over. Glad I caught it!

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post #14 of 84 (permalink) Old 09-08-2009, 06:06 PM
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My 07 makes a similar noise but it appears to be coming from under the car, not the engine bay. Gave up on that one though.
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post #15 of 84 (permalink) Old 09-08-2009, 06:17 PM
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Mines got one but I've given up on finding it. I just live with it haha. Mine doesn't start unitl around 3.5-4k RMP.

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