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Old 02-03-2011, 08:19 PM   #1
SnaP
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Default engine whistle

just started last week... a noticible whistle noise coming from my engine. gets louder when the rpms go up.. almost sounds like a turbo spooling up :-/... lubed teh belt doesnt change it.. turning on / off a/c doesnt change it does it whether driving or sitting still.. 2.5n/a uel headers 118k... im stumped tried searching but cant find anything solid enough
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Old 02-03-2011, 08:50 PM   #2
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Does it have a lightweight pulley? If so, that might be it. I noticed it in my car after I installed one.
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Old 02-03-2011, 09:07 PM   #3
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A whistle can be a sign of an exhaust leak.
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Old 02-03-2011, 09:16 PM   #4
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Could also be a vacuum leak somewhere as well!
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Old 02-03-2011, 09:18 PM   #5
RaceFaceXC
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or a pulley warning you its about to empty it bearings all over the inside of the timing belt cover
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Old 02-03-2011, 10:59 PM   #6
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or if you have an intake. ganzflow or anytthing might whistle. did it on my car. sounded like a turbo kinda. very high pitched
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Old 02-03-2011, 11:03 PM   #7
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Hm, interesting. I have that exact sound too, but never really thought anything about it.

Also, my car is much newer and had that sound since I bought it new? Is there a different answer in this case?
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Old 02-04-2011, 11:13 AM   #8
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Maybe it was that new whistle tip you put on your exhaust. It makes your car go Whoooooo..whoooooo.... or check your intake.
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Old 02-04-2011, 11:16 AM   #9
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I think im experiencing a similar phenomenon!

Can whistling be confused with light pinging though???
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Old 02-04-2011, 01:27 PM   #10
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Quote:
Originally Posted by SnaP View Post
just started last week... a noticible whistle noise coming from my engine. gets louder when the rpms go up.. almost sounds like a turbo spooling up :-/... lubed teh belt doesnt change it.. turning on / off a/c doesnt change it does it whether driving or sitting still.. 2.5n/a uel headers 118k... im stumped tried searching but cant find anything solid enough
have you done your timing belt yet/ replaced all the pulleys and what not
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Old 02-04-2011, 03:55 PM   #11
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You need to determine if throttle position is a factor.

Walk the motor up at 1/4 gas to high RPMS when you normally would hear it. Do the same but w/ 3/4 throttle.

Keep a constant throttle doing this. See about noise.

IF the noise IS throttle related you can most likely rule out any of the belt drive components (and transmission etc). This would mean it is most likely air/fuel related:
-intake ducting
-air filter
-exhaust (leak)
-i maintain it could even be a ping or ten!
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Old 02-05-2011, 12:16 PM   #12
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loose belts in the cold... sometimes my car sounds like it has a supercharger.

also my exhaust whistles between 2-3k rpm when there's a lot of water/condensation inside it... it sounds like a wheel bearing... it went away after I drove it for a few hours without stopping... shorter commutes for me create lots of condensate inside the exhaust.
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Old 02-06-2011, 12:59 AM   #13
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head gaskets/ timing belt / waterpump and all that fun stuff were done around 98K under warrenty.. no intake all everything is stock except for the exhaust.. noise did start in the cold i always though that had somethign to do with it :-\..... noise is there at idle than while im driving steadily increasing or maintaing throttle position.. like sir knight said... sounds exactly like a supercharger .. as the rpms go up it gets louder than when i let off teh gas it just eases down and ive noticed sometimes over the past few weeks the engine doesnt idle down right away between shifts... if i shift at 4000 and press in the clutch the engine will slowly go down in rpms not like it used to.. might be associated with the whistle both started around same ttime
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Old 02-06-2011, 12:48 PM   #14
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Quote:
Originally Posted by RaceFaceXC View Post
or a pulley warning you its about to empty it bearings all over the inside of the timing belt cover


I had this "about to happen" before i changed my tbelt and pulleys. Was all crunchy.
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Old 02-06-2011, 08:20 PM   #15
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My guess. Exhaust leak.
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Old 02-06-2011, 09:06 PM   #16
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Check the "torque" box on your intake. I had the same issue and it was from it not being put back on correctly. Good luck.
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Old 02-08-2011, 03:23 PM   #17
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I have an injen intake and once I put it on, I noticed a whistle with the throttle at about 1/4. If I keep it about 1/4, the whistle is constant. Any ideas
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Old 02-09-2011, 08:44 PM   #18
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Question Similiar whistle?

I have experienced a similar whistle in my 99 Outback. At least I think it is the same. It comes from the rear of the car, but is activated by a certain spot and pressure on my gas pedal. When i hit the spot it remains, but if I push harder or left off the whistle stops.
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Old 02-09-2011, 08:49 PM   #19
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Quote:
Originally Posted by andrew's bug eye View Post
I have an injen intake and once I put it on, I noticed a whistle with the throttle at about 1/4. If I keep it about 1/4, the whistle is constant. Any ideas
Check the hose clamps on the hoses that are attached to the crank case! I tightened mine up the other day and my whistling days are over

note: I dont have a CAI but i do have a Hybrid intake so same hoses just not same intake
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Old 02-09-2011, 09:32 PM   #20
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Quote:
Originally Posted by aclver1 View Post
Maybe it was that new whistle tip you put on your exhaust. It makes your car go Whoooooo..whoooooo.... or check your intake.
ahhH! beat me to it. If it's only in tha moanin, it's def whistle tips. If it is all the time, it's probably your intake.

Mine whistled a little bit when I first got my car, then I installed a hybrid intake and it got louder. Mine does it the loudest under smooth RPM climbs in 2nd and 3rd gears. Like mentioned above, if you can confirm that it is your intake plumbing it shouldn't be an issue. I guess you could install some sort of resonance chamber to get rid of it. That is what THIS (circled below) is on the stock intake if I understand correctly. There is also one under the torque box.

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Old 02-09-2011, 11:53 PM   #21
andrew's bug eye
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yeah its definitely weird. ill check all my fittings and let yall know
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Old 02-10-2011, 08:21 AM   #22
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Quote:
Originally Posted by Overload11 View Post
I have experienced a similar whistle in my 99 Outback. At least I think it is the same. It comes from the rear of the car, but is activated by a certain spot and pressure on my gas pedal. When i hit the spot it remains, but if I push harder or left off the whistle stops.
Could this be the fuel pump? I have this, and it seems to be getting worse (happens more often, and not just in cold situations).
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Old 02-11-2011, 01:32 AM   #23
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It might be, I googled fuel pump humming noise and it seems to a similar description
of what is going in my Subaru. Is there a good way to find out if the fuel pump is bad?
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Old 02-11-2011, 10:30 AM   #24
Boxer4Dad
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I think the only way is some kind of fuel pressure check. I'm about to get one for mine. At 130K, it wouldn't be a surprising failure. When I've had them go in the past (other makes), you could usually hear the whine for a while, and it just got harder and harder to start. Mine starts hard now, which I thought was due to the cold, but it just might be the pump going. Hope that helps, and sorry about the threadjack...
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Old 02-12-2011, 07:04 PM   #25
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Quote:
Originally Posted by Overload11 View Post
It might be, I googled fuel pump humming noise and it seems to a similar description
of what is going in my Subaru. Is there a good way to find out if the fuel pump is bad?
If the fuel pump is bad it would have trouble starting occasionally and I would imagine it would have issues under hard acceleration (ie shuddering/coughing) Eventually it would be stalling, then ultimately not start for you.
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