stock bypass valve question

[armyguy22]

my car will boost up to 5 psi but it is not making power. i think it is a faulty bypass valve but i am not sure. is there a way i can test it?

[Nick M]

The bypass valve recirculates into the intake. That won't hurt your power. Unless you have a leak, in which you will also have a stalling condition.

How down on power are you? 5psi is pretty close to stock.

[armyguy22]

it will build up to 5 psi but i think the valve is stuck open or something so it cant make power. it just kinda stumbles after 3000 rpms

[Nick M]

It stumbles at 3000 rpm? At WOT?

[johnathan1]

Sounds like a boost leak...are you getting a check engine light or any error codes?

[87M-GTE]

when i go WOT at about 3500rom it reaches peak boost at like 5psi and as it revs higher to like 5500 it slowly drops to like 4psi, but i never thought anything of it... is that also a bypass valve issue or a boost leak?

[armyguy22]

i think my check engine lightbulb is blown so i don't know if I have any codes. I had a boost leak in the turbo to intercooler hose and when I got up to 3000 rpms I could hear the turbo blowing the air straight into the atmosphere. It would also put out a cloud of black smoke. I replaced that hose and now it boosts to 5 psi past 3000 rpms but I still here the same sound. No black smoke though. does anyone know what could cause this?

[GrimJack]

Lots of things. FIRST fix that check engine light. It's used for the very first step in just about anything engine related on this car - checking for codes.

[armyguy22]

yeah thats on my to do list I am just wondering if this has happened to anyone else and how to fix it.

[shaeff]

^ As GrimJack stated, check codes FIRST, THEN ask questions. ;) It would have saved the above 9 posts. ;)