hey guys, so i have an 09 cobalt ss tc.

mods list:

hahn catless + 3" street exhaust
zzp intercooler kit
hahn intake
forge bpv
and gm stg 1 sensors.

so ive read quite a few forge bpv issue threads and i cannot determine what to do i need help for my specific situation.

im gettin turbo flutter. usually its when the car is in vacume, but sometimes is even under light boost (under 5 psi). the car is not tuned yet, tune is scheduled for tomorrow... im worried about this turbo flutter, i know its not good for the turbo. the intake, bpv, charge pipes and sensors went in all within the last week in that order. intake and bpv one day and charge pipe and sensors 2 days later. im noticing the flutter alot mroe now, every time i release the gas, even unde rlight loads of boost -under 4-5 psi.

all connections are tight, bpv is facing down with green spring installed. i have no idea how i can fix this. vacume line is tight on bpv

only code car has thrown was p2227... dont even know what it is for certin, believe its the code that the car throws when u have 3 map bar snesors and no tune..

 

Make sure ur vacuum take is hooked up right, line closest to passenger side goes to bpv solinoid connection closest to front of car, line closer to drivers side goes to intake mani. Solinoid connection pointing to back of car goes to lower charge pipe. Make sure that all correct and that ur solinoid is actually working .

 

And that you didn't install the bpv upside down. Opening to the top.

 

And just noticed that you have the 3 bar sensors and are not tuned for them. All bets are off. There is no possible way to troubleshoot your issues until you are tuned for those.