P0138-Is it normal too gain alot of boost from a new 02 Sensor?

[DaZone]

recently been having some boost problems.... full boost i get stuttering and backfire.. then the CEL..

today i replaced 02 Sensor.


I go for a test drive and all of a sudden i had tooo much boost. After adjusting the stock s3 wastegate back to 23psi, like a few days ago.


replaced o2 sensor.. more boost again.
It was reading 26psi until a big backfire.

i thought the pcm controls boost.. S3 stock wg - blackline.

And all my hoses popped off.

no brakes no boost guage working. terrible idel.

how many lines are on the brake booster? i know its missing from there. i just dont see it.. engine tooo hot..

Is it normal too gain alot of boost from a new 02 Sensor?

[lphooper03]

Unless your car was running super rich before hand, you shouldn't really be gaining a lot of power from replacing the o2 sensor. Just plug all your vacuum lines back in and the brake booster is the black green ringed vacuum line to the right of your turbo, under your intake pipe. It sounds like what you need to do is zip tie all of your lines and make sure everything is connected in the right spot and you should be good to go.

Or, you could eliminate all the stock lines and replace the vital ones. I.E.: BOV, Turbo, WGA. There are diagrams on how to do this.

Edit: just read you are stage 3 and prolly don't want to get rid of ur stock lines..