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Old 03-16-2011, 02:49 AM   #1
dtseng01
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Question Water "gurgling" sound coming from engine..?

Hey everybody,

I'm going to try my best to explain what kind of sound I hear, but it really is rather a strange noise that I've never heard before so please bear with me..

At certain times when I rev my car or go "forward" in my car (deploying clutch + gas), I can hear a sort of "water gurgling" sound coming from the front of my car, which I am expecting/assuming that's coming from the engine bay. This sound tends to be most predominant when the RPM is low, around 2k - 3.5k.

This gurgling sound is... well, peculiar, and hard to pinpoint. Sometimes it' faint, sometimes it's not there at all, and sometimes it's quite loud (not LOUD like a exhaust, a bypass/BOV, or wastegate, but you can hear it.).

This sound seems to be predominantly there when my car is cold, right when I start the engine. Then again, it is also most quiet in the morning when I start my car with no-one around, so I can't be 100% positive.

If someone was to ask me to explain "why" my car is making this sound, the only logical explanation I can give is that there is water in my air-system/intake/topmountIC that is 'gurgling' when I rev my engine (thus making air go thru the piping and making the water gurgle)... but yet, this explanation is just straight, well, silly.

Once I was at a shop getting my oil and brakes done I asked the mechanic and he said it was because my coolant/fluids were low, and the sound was probably the air in the system. But even after he filled everything up the sound was still there...

I don't see/think/feel there is anything wrong with my engine, but the sound is sort of worrying me. Has anyone else experienced this sound before??? or am I just going crazy??


here's a modlist for my engine, if it helps:

2005 STi

K&N shortram intake
Prodrive boost solenoid
3" helix catted DP
3" catback exhaust
stage2 dynotuned by Harmon Motive.

And for reference, no, I do not have a BOV and I'm positive what I'm hearing is not compressor surge or the ebay-bov's-flap-meister flappin-da-flap-flap.

Any input would help thanks in advance!

And sorry for the novel, hope it wasn't too long
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Old 03-16-2011, 05:51 AM   #2
A-man07
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What's the coolant level in the overflow reservoir? First thing I'd try is burping the cooling system as this very much sounds like air in it.
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Old 03-16-2011, 09:48 AM   #3
Feign
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Air in the system, not in the intake tract. If that was the case you wouldn't have a working car.

Burp the system. Easiest way it to fill the system as much as possible when cold, start the car, turn the heat up all the way with the fan on high. Leave the cap OFF and keep the system full of coolant. You'll have to add a little bit. Watch Meatbawl's timing belt video at the very end to see how it's done (it's in the Service and Maintenance forum).
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Old 03-16-2011, 11:05 AM   #4
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Quote:
Originally Posted by Feign View Post
Air in the system, not in the intake tract. If that was the case you wouldn't have a working car.

Burp the system. Easiest way it to fill the system as much as possible when cold, start the car, turn the heat up all the way with the fan on high. Leave the cap OFF and keep the system full of coolant. You'll have to add a little bit. Watch Meatbawl's timing belt video at the very end to see how it's done (it's in the Service and Maintenance forum).
I mention this to remove the ambiguity in the definition of "the cap."

Subaru turbos are water cooled and have a gravity/convection cooling system, the most visible component being the top water reservoir next to the turbo. This water "tank" has a radiator-like cap, and is often referred to as "the cap" as I suspect feign intended. This turbo supply tank is the top-most point in the cooling system, and is THE only place coolant is to be put.

While merely burping and pouring as needed works, there is a cheap and better method... the "Spill-Free Funnel" makes this job a snap, and perfect every time, no guessing whatsoever if you got all the air out.

The cap for the turbo supply tank is unique to this tank, different in both operation and pressure than the one down on the radiator. The most important difference is its dual-action, having the duty of allowing negative pressure to suck coolant in the overflow tank back into the engine's cooling system. This cap has a lower pressure rating than the one on the radiator.

It is imperitive that owners maintain the small negative-pressure valve's operation... failure to do so can, and will, result in blown headgaskets. Subaru issued a TSB some years after a lot of damage had been done because of this, and uninformed owners continue to allow cooling system failures because of a little unseen muck on the valve in this cap.
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Old 03-16-2011, 11:12 AM   #5
NemesisSi
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I have had the same sound. Usually happens when I first start off from any stopping point, more so in the morning. Asked Subaru about it and they said it is common and maybe the sound of air flowing through the downpipe. I thought it had something to do with the clutch. Either dirty fluid or breakdown of clutch.

I have had a new clutch and flywheel plus Cobb TBE installed in the past few months and I don't think I hear it anymore. Maybe I'm used to it and just don't hear it anymore.

Will listen today to see if I hear it!
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Old 03-17-2011, 02:58 AM   #6
dtseng01
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I will try burping the system. Not exactly sure what that means but some reading will do the trick

Quote:
Originally Posted by SeeeeeYa View Post
the "Spill-Free Funnel" makes this job a snap, and perfect every time, no guessing whatsoever if you got all the air out.
Can you explain in more detail what exactly this "spill-free funnel" method is? if it really is as great as you make it sound, I will def go with this method.
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Old 03-17-2011, 10:12 AM   #7
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Quote:
Originally Posted by dtseng01 View Post
I will try burping the system. Not exactly sure what that means but some reading will do the trick



Can you explain in more detail what exactly this "spill-free funnel" method is? if it really is as great as you make it sound, I will def go with this method.
I believe he means this:

http://www.summitracing.com/parts/LIL-24610

Great investment of $20
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Old 03-17-2011, 02:28 PM   #8
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Quote:
Originally Posted by icudruln View Post
I believe he means this:

http://www.summitracing.com/parts/LIL-24610

Great investment of $20

That's it.

Just Google "Spill-Free Funnel" for a wide range of information, including you tube how-tos.
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Old 03-17-2011, 03:12 PM   #9
dtseng01
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Awesome, thanks a bunch!
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