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Old 08-24-2014, 01:05 PM   #1
CLEwrx
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Default Hissing sound coming from front of intercooler

Hi guys,

I have a 2014 wrx stock except for the Cobb AP. I have noticed that when I have the car in neutral and press the gas petal (i only go about a 1/4 of the way down, if that) there is what it sounds like there is air leaking out. It almost sounds like what the BOV sounds when is venting to atmosphere.

I removed the TMIC and took off the rubber sleeves at each end of the hose from the IC to the throttle body and tight them back up but it still doing it.

I attached a video of what it sounds like. It is driving me crazy. I can figure out what is causing it.

Is this normal? I don't think that noise was there last week. I have been trying to upload the video of that sound from my computer but for some reason it is not letting me. I am going to upload it to you tube and then try to do it that way.

Any input on this would really help me out. Thank you.
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Last edited by CLEwrx; 08-24-2014 at 01:16 PM.
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Old 08-24-2014, 01:23 PM   #2
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Old 08-24-2014, 01:53 PM   #3
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You have a plastic bpv correct? It sounds like the bpv isn't hold pressure anymore
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Old 08-24-2014, 02:09 PM   #4
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are you not under warranty still??
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Old 08-24-2014, 02:14 PM   #5
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Quote:
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are you not under warranty still??

nope....not with the AP he isnt
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Old 08-24-2014, 02:25 PM   #6
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The car is only 5 months old, but having the AP would make it a pain to go the warranty route. I knew what In was getting into when I installed the AP.

If it is the BOV, that would also explain the undersboosting as well.
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Old 08-24-2014, 02:27 PM   #7
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What would you guys suggest, aftermarket or getting a new OEM BPV?

Last edited by CLEwrx; 08-24-2014 at 02:34 PM.
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Old 08-24-2014, 03:03 PM   #8
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Check out the forge brand BPV line. They are very well built valves and affordable as well. And yes a leaking bpv will explain the under boosting as well.
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Old 08-24-2014, 05:20 PM   #9
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Plastic bpv sucks get the forge or tial recirculating bpv and it will be all good. An adapter can be had for 70ish from p&l motorsports. I'd suggest the tial, hands down best BOV on the market.

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Old 08-24-2014, 05:45 PM   #10
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Thank you for the input guys. I am going to take it to the dealer to make sure is not something else. If it is the bov I will go forge for sure.



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Old 08-25-2014, 04:19 PM   #11
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So guess what the dealership said?? Is normal, just the BPV recirculating the air.

What do you guys think? BS?


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Old 08-25-2014, 09:45 PM   #12
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Time for a second opinion. Take it to another dealership
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Old 08-27-2014, 06:45 AM   #13
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Ok, so I think I figured it out. I believe is the recirculating hose that goes from the top of the BPV to the intake manifold. I will remove the TMIC on Saturday and out and maybe put a zip tie or hose clamp on it and see if that works.




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Old 08-27-2014, 06:12 PM   #14
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Quote:
Originally Posted by CLEwrx View Post
Ok, so I think I figured it out. I believe is the recirculating hose that goes from the top of the BPV to the intake manifold. I will remove the TMIC on Saturday and out and maybe put a zip tie or hose clamp on it and see if that works.




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soo you went to the dealer or you think you found the issue? spray some soapy water around all that area and see if you see any bubbles. if you did the tb hose ends I bet its one of the bpv hoses leaking somewhere.
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Old 08-27-2014, 10:27 PM   #15
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Both, I took it to the dealer and they said is normal, they also said that if the hose was off it would run rough or it would give a CEL.

The noise is coming from where the recirculating hose from the top of the BPV would connect to the intake manifold.

Also, I have an AP and all the A/F numbers are all normal, nothing above +\-7% so it doesn't seem to be an actual leak, maybe air escaping
Out of the hose at the end that connect to the manifold.


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Old 08-28-2014, 11:37 AM   #16
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I 2nd By Taking It To Another Dealer. Get Some More Opinions.
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Old 08-28-2014, 06:46 PM   #17
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Quote:
Originally Posted by CLEwrx View Post
The car is only 5 months old, but having the AP would make it a pain to go the warranty route. I knew what In was getting into when I installed the AP.

If it is the BOV, that would also explain the undersboosting as well.
Not sure why the AP would create a warranty issue for you. I've had no warranty issues with a large number of mods.
Either way, get rid of the composite and get something that should have been on the car in the first place.
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