Thread: Low boost, block off boost bypass solenoid. Full boost returns..

Originally Posted by QUICKSILVER462

I found the vent plugged on the BBV solenoid on my car the day I drove it home after buying iy in 09'. It should have a little filter on the end of it, they get clogged with dirt over the miles and years. I removed the garbage and installed a 90 degree angle vacuum elbow on the end of it, cured the problem of not gatting full boost at WOT.

I figured that's what happened to my old BCS, so I bought a new BCS from the dealership. Thanks for the reply.

LOL nm just seen you did that i would say the ecm is causing it to not go full boost....i dont have it even hooked up on mine i just have the top of it hooked up so it still vents at idle

Originally Posted by 00grandprixgtp

LOL nm just seen you did that i would say the ecm is causing it to not go full boost....i dont have it even hooked up on mine i just have the top of it hooked up so it still vents at idle

Which brings me to my 3 questions and also can a bad ECM cause these types of symptoms?

Took pictures to show what I did.

Cap off the "T" were the vacuum hose from the BCS goes to


Unplug the BCS (electrical connection)


Let this end of vacuum hose from BCS just sit/ lay there


No tab for the BCS to bolt onto, came from ZZP that way


Full picture to include the messed up paint from carb cleaner landing on the snout, not happy about that, but had to do it for possible leaks.