Bov problems - Subaru WRX Forum
 
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post #1 of 8 Old 09-03-2012, 08:45 PM Thread Starter
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Bov problems

Hi,
I just installed a Turbo XS bov on my 2011 wrx. I took it out for a test run and now there is a backfire noise after I shift. Why is that? And what can I do to fix it? Please help.

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post #2 of 8 Old 09-03-2012, 08:59 PM
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Hand me a pistol. So I can off myself!
I'm sorry, please research stuff you spend money on.
Take it off and sell it. (dislike)

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post #3 of 8 Old 09-03-2012, 09:02 PM
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They ARE NOT backfires, they are after fires. Unspent fuel burning off in the exhaust from using a BOV (and particularly a bad one at that). The only way to fix it is either get a better brand, or put the stock on back on.

Joshua
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post #4 of 8 Old 09-03-2012, 10:02 PM
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I assume that your car is almost stalling every time you rev the engine while at idle also.

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post #5 of 8 Old 09-03-2012, 10:04 PM
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After fires because now you're running rich between shifts. The only way to stop it is to take it off. Not a huge deal that it's doing it. What I would be worried about is that TXS H-line valves tend to leak.
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post #6 of 8 Old 09-04-2012, 11:19 AM
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When it wooshes, that atmospheric BOV is getting rid of fresh/cool/compressed air that the engine is expecting to be there. Your ECU is dumping extra fuel into your engine which would normally mix with that air and since there's no air to mix with it, it's igniting much later than it should (when it hits the air in your exhaust pipe). I'd also recommend putting your stock bpv (or another fully recirculating unit) back on.

Here's a bit of reading on the topic: Blow Off Valve FAQ: Read if you are thinking of buying one! - NASIOC

John
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post #7 of 8 Old 09-04-2012, 04:30 PM
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Quote:
Originally Posted by BLAZE2099 View Post
I'm sorry, please research stuff you spend money on.
Take it off and sell it. (dislike)
Like times 100, yes please before you tinker around with something that you don't know please research. Take it off, the stock unit is perfectly fine. If your just looking for a "cool" noise than get a catback or something..
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post #8 of 8 Old 11-03-2012, 06:10 AM
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When it works, that atmospheric BOV gets rid of fresh and compressed air that the engine is expecting to be there. The ECU has dumped extra fuel into your engine that normally mix up the air. If fire occurs you can run between the shifts.


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