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GFB BOV Issues

2212 Views 77 Replies 10 Participants Last post by  waveslikeweapons
So I installed the GFB Respons BOV, and almost immediately got a CEL. Now I know some folks were having an issue when it was left to 100% vent, which I did at first not knowing this. So I closed it to about 50/50, cleared the code, still getting a CEL. At first I was also loosing boost after about 20 minutes of driving, was great in the first 20 minutes, but then it dropped. Now that I have it at 50/50, I'm still getting the CEL, and it's dropping boost after about an hour of driving.

Anyone else run in to this, or know what is going on here?

I have been trying to look this up, and everyone else fixed this by not leaving it to full vent, this however did not work in my case.

Thanks in advance!
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I believe so. I'm sure any route anyone goes it will work the same I would imagine?
Okay so it IS still doing it. It just takes a lot longer for it to happen. Tested it last night. Not sure what's going on at this point, any ideas?
Cel and boost drop?
Okay so it IS still doing it. It just takes a lot longer for it to happen. Tested it last night. Not sure what's going on at this point, any ideas?
I would start adjusting preload on the BOV. Are you venting to atmosphere?
Also what else have you done to the engine/exhaust?
Cel and boost drop?
Yep, took it out for a long drive last night, drove it harder, took a bit but it did happen.

I would start adjusting preload on the BOV. Are you venting to atmosphere?
Forgive me, but I am not sure how to do that? I am venting, I was going to adjust how much, and I have forgotten which way to turn it, is it left to close it off more?
Also what else have you done to the engine/exhaust?
Takeda Stage 2 Open top intake, and exhaust resonator delete.
This is the first car I have had where I modified something that was turbocharged so I am a little in-experienced with it.
Yep, took it out for a long drive last night, drove it harder, took a bit but it did happen.


Forgive me, but I am not sure how to do that? I am venting, I was going to adjust how much, and I have forgotten which way to turn it, is it left to close it off more?
If you want to play with the spring adjustment try tight first and see what happens. I found that you can get in there with one of these small ratchets. You don't have to remove the lower shield and can reach over it from underneath.

I have tried 2 turns loose 4 turns loose and full tight and they all seem very similiar with no cel yet.
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Oh that lol, okay I know what that is, it's at factory. What do you recommend for the setting on it? I do want the sound, but I also don't want the CEL or the boost loss.
I meant the adjustment for the venting for which way vents more and which way closes it off, is it the same as the spring? Left for more vent and right for less?
Not sure on venting sorry. I have the recirc design. What is the cel code
Counter clock-wise will vent less to atmosphere. Try running the center preload spring all the way in and see how it does. I'm running mine 1 turn out from fully compressed.
Not sure on venting sorry. I have the recirc design. What is the cel code
P226100
Counter clock-wise will vent less to atmosphere. Try running the center preload spring all the way in and see how it does. I'm running mine 1 turn out from fully compressed.
I'll give that a shot on my weekend, provided we don't get more snow again..... Temp plummeted yesterday from 61 to 34 overnight.
As much as I hate to say this I would swap the BOV and solenoid back to stock to see if the cel stays away for a couple weeks. That's just me. since this seems odd based on what you have done.
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As much as I hate to say this I would swap the BOV and solenoid back to stock to see if the cel stays away for a couple weeks. That's just me. since this seems odd based on what you have done.
I imagine it would, but being me and not tuning the valve that's on there now I would also imagine I was bound to run into some issues. I have a feeling it is the way I have the spring combined with what I am venting at this point. I am going to try that before swapping it back. The solenoid did help, quite a bit, just didn't completely solve it.
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