buzzing sound at throttle let-off

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Feb 26, 2004 | 04:52 PM

hashiriya

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buzzing sound at throttle let-off

I'm not sure if this is engine or transmission related. I can hear an odd buzzing/rattling sound when I let off the throttle that wasn't there before. I'm not sure if it's the turbo spooling down or something in the tranny gone awry. It only lasts for a couple of seconds, but it's definitely audible to everyone in the car.

Any suggestions?

Feb 26, 2004 | 04:59 PM

Wingless Wonder

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From: Sacramento CA

Car Info: 02 Impreza WRX sedan

Let's try to isolate the noise.

If you rev the engine when the car's sitting still, does it make the noise then?

Does it make the noise only when the vehicle is in motion?

Does it make the noise when you push the clutch in?

Does it always make the noise at the same RPM range? the same gear, or any gear?

--
0==WW==0
"…axles of evil…" - george w. bush

Feb 26, 2004 | 05:47 PM

sigma pi

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From: Chavez Ravine

Car Info: 03 Impreza WRX

my guess is the tranny and awd

Feb 27, 2004 | 03:42 PM

hashiriya

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Ok, so I played with this problem quite a bit today. The facts:

It always seems to happen around 3250rpm, regardless of what gear it is in, and disappears about 500-750rpm down from there. I have honestly not heard it in fourth or fifth, but the noise would not be audible at that rpm in either gear, with wind and other noises. It does not happen all the time, for instance it will not happen the first few times you drop through that rpm range after pulling away from a stop. It does not happen in neutral, at least not as far as I have seen. It definitely sounds like something spinning down, but I don't know whether it's engine or tranny related. If anyone wants any more info for their diagnosis, I'll be happy to go test. Thanks for all help.

Feb 27, 2004 | 04:19 PM

TurnWRX

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From: CA

it's not a popping noise is it?

Feb 27, 2004 | 05:23 PM

mexicanpizza

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From: ...a craphole in No.County San Diego

Car Info: MMVI AW WRX STI

What exhaust/heatshield/hanger mods do you have?

I had a wicked rattle when I would let off which was my downpipe barely buzzing against the frame.

Feb 27, 2004 | 05:26 PM

hashiriya

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Car has no mods whatsoever. It's a 2004 with about 2100 miles on it. I actually found a thread that talked about something sort of like this, but there was never any resolution. He described the sound as a "whirring", which is probably more accurate.

Feb 27, 2004 | 06:11 PM

MonkeyAB

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From: How do you swap an RSTi?

Car Info: 2001 Impreza 2.5RS(Ti)

I think my car does this too. Has me kind of worried and I have no clue what it is. Well I guess this is a useless post. My noise is coming from the engine area, I don't think it's the tranny. I feel like it's coming from the turbo...

Mar 1, 2004 | 04:01 PM

hashiriya

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It happens at 3250rpm in all gears, confirmed. I'm really starting to think that it isn't the tranny either, which is a very good thing.

Mar 1, 2004 | 09:15 PM

#10

escaflowne

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From: Bay Area

Car Info: 2004 Black WRX wagon

it's normal. that's all i can say. haha.

Mar 2, 2004 | 07:04 AM

#11

VRWRX

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From: Trying to figure out something creative to put her

Car Info: 2005 CGM WRX Wagon

Take it to the dealer. They will likely say that it's normal, but give it a shot.

Mar 2, 2004 | 10:06 AM

#12

nic3krnnamja83

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From: Santa Rosa, CA

Car Info: 02 Subaru WRX w/ JDM Spec C

its gurgling in the engine bay, i am not sure either exactly people have told me air bubbles in the reserve tank, but imma go to the dealership this friday and ask...will let u know....

brandon

Mar 2, 2004 | 04:31 PM

#13

hashiriya

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Normal is good, I've had enough problems with this car for only having 3k miles on it.

If nothing would ever break ever again it'd be the best car ever...

Mar 24, 2004 | 08:29 PM

#14

hashiriya

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Ok, I know this is an ancient thread, but...

I have established that it does indeed happen in neutral, only for some reason it won't happen just after starting the car when parked. After some driving, it'll do it, and in neutral with the rpms dropping while moving, it'll do it. This is proof enough to me that it's not tranny/awd related, so I think I'm going to take it to the dealer. Any further words of wisdom given this information? What would make this noise from an engine/turbo standpoint?