Hi all. My turbo is acting very strange. I purchased an 02 WRX with a blown motor, swapped in the motor from an 04 WRX, and am having an issue. The turbo delivers zero boost (it actually pulls very minor vacuum) and makes a sound that's hard to describe. The closest thing I can liken it to is a vacuum "vyewwww"
Here's what I've done to test thus far:
1) Checked all vacuum lines. They look intact and without any damage.
2) The wastegate opens freely when the arm is disconnected. With the arm connected, you can pull the wastegate open with the arm.
3) The turbo spins freely and has no shaft play.
I put the car into test mode to test the boost control solenoid. That failed (no air passes through), but I connected the two vacuum lines to one another to simulate it being open. This did not produce any boost nor change the noise.
Any ideas? I plan on replacing the boost control solenoid as soon as I can get one from the dealer, but it doesn't seem like that will fix it. And it did not address the noise. Thanks.