Hello guys, so ive had about a 3-4 pound boost leak, ive tried a boost leak test with my friend but we heard nothing, ive checked all hoses and all the routing, everything's connected, i replaced my throttle body seals, both of them, erg hose that popped off was also put back on, replaced some older boost lines and just checked all the intercooler piping and replaced the hoses for those aswell and tightly secured all clams, even put a new intercooler in just incase, atlas still a boost leak, so i replaced my boost sensor and gauge thinking it was that but still the same, at this point im thrown for a loop, my dad said it might be the waste gate stuck slightly open, can this happen ?

 

What do you mean by a "3-4lb boost leak"? When doing a boost leak test the system always leaks down as air goes through the engine.

 

just looking at my boost gauge before it was 20 under full boost now its 14-16 at most

 

That's probably not a boost leak. More likely a turbo or waste gate issue.

 

or some bad gas... and the thing is knocking and its trying to limit boost.

 

That's not how it works.

 

The stock ECU can reduce wgdc on knock if running a Tephra rom. But I've never seen anyone use that feature. And it wouldn't constantly be 4psi low.

 

Right, on the 10 you can reduce it via TPS. I assumed the OP would also say the car was blaring the knock CEL light as well.

This has text book wastegate pressure/issue written all over it.

 

I agree

 

Would this cause a check engine light to come on if it was knocking for 5 months? Also i did a compression test and all cylinders are 180-190

 

Check boost control hoses/connects, check wastegate actuator and actual wastegate flapper.