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Old 09-28-2012, 08:44 AM   #1
QwaktastiK
Scooby Specialist
 
Member#: 219100
Join Date: Aug 2009
Chapter/Region: Tri-State
Location: Philadelphia, PA
Vehicle:
'09 WRX Premium 5dr
COBB Stg3 336whp/370wtq

Default Forge BPV all of a sudden doesn't sound like it's doing its job

Car: 2009 Subaru WRX
Mods:
Cobb Accessport (Stage 2+...low wastegate duty map)
Cobb SF Intake & Airbox Combo
Process West TMIC
Forge BPV
SPT Turbo Heatshield
Turbo XS High Flow Catted Downpipe
Turbo XS Catback Exhaust


The only recent changes have been a change in ambient temps with the end of summer beginning of fall.

Symptoms:
When my engine is cold, the BPV and/or intake do not sound as though they are operating properly. This happened overnight coincidentally with the change in ambient temps. I now have a flutter that I didn't have before. I would describe it as a hesitation, not the normal deep breath in and deep breath out. Although the car FEELS fine. I make a point to stay out of boost until the engine is up to temp, but even staying out of boost I normally hear the intake/BPV sucking/blowing air respectively. Once the engine is warm, and I go into boost, they sound normal and I'm boosting fine. I don't know if at this point is has to do with my stock spark plugs and my power level or whether my intake is in a dire need of a good cleaning or if the BPV spring is failing or what.
Any insight?

My apologies if this is something stupid and obvious, but I'd rather be safe than sorry. Just thought it was alarmingly different in sound and I've been at this same power level for over a year. Last year's change in seasons I did not have the same issue.

TIA.
. . .
matthew
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Old 09-28-2012, 08:50 AM   #2
garudatwo
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Member#: 322385
Join Date: Jun 2012
Chapter/Region: Tri-State
Default

Matt, when's the last time you cleaned out and relubed your Forge?
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Old 09-28-2012, 09:18 AM   #3
QwaktastiK
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Member#: 219100
Join Date: Aug 2009
Chapter/Region: Tri-State
Location: Philadelphia, PA
Vehicle:
'09 WRX Premium 5dr
COBB Stg3 336whp/370wtq

Default

Installed it in January of 2012. About 8k miles since. Haven't cleaned/relubed it. How often are you supposed to?
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Old 09-28-2012, 09:52 AM   #4
garudatwo
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Join Date: Jun 2012
Chapter/Region: Tri-State
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I'm no expert, but when in doubt, it can't hurt to clean and relube.
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Old 09-28-2012, 10:20 AM   #5
QwaktastiK
Scooby Specialist
 
Member#: 219100
Join Date: Aug 2009
Chapter/Region: Tri-State
Location: Philadelphia, PA
Vehicle:
'09 WRX Premium 5dr
COBB Stg3 336whp/370wtq

Default

Will do over the weekend. Thanks for the quick response. I'll report back.
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Old 09-28-2012, 11:10 AM   #6
Source,LLC
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Member#: 322524
Join Date: Jun 2012
Chapter/Region: MWSOC
Location: Chicago,IL
Vehicle:
3.5 WRX STI
WRB

Default

Your intake and BPV should sound the same if the engine is cold or warm as neither of those parts have any sort of lubrication running through them that need warming. You are smart to stay out of boost until oil temp has reached safe levels. The change in temperature could cause changes in the noise slightly since the air will be denser, but in my personal experience it isn't anything that I've heard that worried me. As another poster suggested it's easy enough to take off the BPV, relube, and check visually for leaks; it might be a good thing to check the intake for any loose clamps too.
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Old 10-04-2012, 02:24 PM   #7
QwaktastiK
Scooby Specialist
 
Member#: 219100
Join Date: Aug 2009
Chapter/Region: Tri-State
Location: Philadelphia, PA
Vehicle:
'09 WRX Premium 5dr
COBB Stg3 336whp/370wtq

Default

I picked up some Mobile 1 synthetic lube yesterday. Removed my Forge BPV for a good cleaning and relube. When I opened up the BPV I was surprised at how sticky the original lube had become. The piston didn't want to come out. Took more force than it should, had the lube been slick. I cleaned all the old sticky lube out and got the BPV spotless. I opened up the canister of Mobile 1 lube I just bought and that stuff is good and slick (not sticky at all). Wasn't sure how much to apply, so I gave it a good coating. I made sure the piston could move up and down freely. So far so good. Car seems much happier even when cold. Thanks for the suggestion guys. Glad it's that easy. I'll add that to my normal maintenance list.
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