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2016 Veloster Turbo DCT w/ Tech Package
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One more thing. Think of the BOV as something that really wants to open. Even without anything connected to it, it will open as soon as the intake pressure exceeds the spring pressure (presuming that the spring pressure is higher than 1ATM). The only way it can stay closed above that pressure is if a greater pressure is applied to the vacuum port. The only way the boost can exceed that pressure is if the turbo is producing more airflow than the BOV can flow out. This (for the most part) can only really occur if your wastegate is not preventing the turbo from continuing to spool up.

Note that some of the above is a bit of an oversimplification. I don’t think anyone should come along and consider that an ideal synopsis of boost functions.
 

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Discussion Starter · #22 ·
Long story short I was able to determine that the slug inside the solenoid for whatever reason wasn't falling back down once the BOV actuated, although the power running through it was able to hold the slug down. I could manually push it down and it'd work once, and then it would stay up.

I ended up just getting the Pierburg boost control solenoid a little over a week ago and installed it. Haven't had any issues yet
 

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Premium Member
2016 Veloster Turbo DCT w/ Tech Package
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Long story short I was able to determine that the slug inside the solenoid for whatever reason wasn't falling back down once the BOV actuated, although the power running through it was able to hold the slug down. I could manually push it down and it'd work once, and then it would stay up.

I ended up just getting the Pierburg boost control solenoid a little over a week ago and installed it. Haven't had any issues yet
Great efforts to diagnose. This summary will likely help many forum visitors. Every once in a while I get surging that seems to be due to the MAC solenoid that controls my wastegate seeming to not do its job so maybe the slug you are referring to is occasionally staying up in mine.
 

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I'm having the same issues as you, getting the code and the compressor surge and fluttering. No more BOV opening at low rpms and it's not opening very short at high rpms. I replaced the BOV and also the pierberg BOV solenoid. I see you went with the pierberg boost solenoid. I'm a bit confused. Where does the ECBS go?
 

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Premium Member
2016 Veloster Turbo DCT w/ Tech Package
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102 Posts
I'm having the same issues as you, getting the code and the compressor surge and fluttering. No more BOV opening at low rpms and it's not opening very short at high rpms. I replaced the BOV and also the pierberg BOV solenoid. I see you went with the pierberg boost solenoid. I'm a bit confused. Where does the ECBS go?
The boost solenoid is on the exhaust side of the engine near the turbo. It connects the boost pressure vacuum hose to the wastegate actuator.

Quick update on my issue too. The solenoid finally got stuck in such a way that the wastegate was stuck closed(?) as in no way to keep it from overboosting. I actually cut the solenoid open to have a closer look and found what appeared to be a dried up/melted o-ring or something that seized the little slug. I ended up just getting another MAC solenoid because I previously had the solenoid connected wrong and I think that may have contributed to its short life.
 
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