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What's going on you guys my 2014 focus st has a problem that has been going on for a while sometimes the boost works and sometimes it does not at all. What do you guys think it is
 

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What's going on you guys my 2014 focus st has a problem that has been going on for a while sometimes the boost works and sometimes it does not at all. What do you guys think it is
Probably a boost leak with the piping or an issue with the BPV. The OE BPV sucks a big one.
 

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Are you tuned? Are you reading zero boost under wot or is it just lower. Probably a boost leak, you can get it smoke tested at the dealership or a decent shop if you don't know how to do it yourself.
 

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A better description of the problem will net you better feedback. Such as under what conditions is the boost not working? Any modifications to your ST?
 
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