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You mentioned VTC. Do you own an S14 SR20DET? If so, a SOHC KA MAF will NOT work. If you own an S13 engine, with the #62 or #E5 ECU, then it does not have VTC, and a SOHC KA maf WILL work just fine.
#2 how long have you owned the engine. Smoking on initial startup is normal if it is the first time you have ever run the engine since it came from japan. that should go away in about 2hours-5hours of run time.
#3 Faint tapping from the valve cover of SR20DET engines is normal... FAINT tapping... it should be barely audible click click click click with no abnormal clicks in between.
#4 You said you dont have a boost gauge, and then you mentioned 3psi. There is no way for you to tell how much boost you have without a gauge, you need a gauge.
#5 Boost leaks cause serious problem for MAF engines. make a boost leak checker, and find all the small leaks in your plumbing, it will make the car run right, if everything else is right.
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