berryl
SDD Junior Member
After I installed my DIY Air filter I heard a lot more noise coming from under the hood, which is great. But I am now hearing a noise that I'm not sure is so good. I guess the best way to describe it is a PSHOOOOO sound, starts out louder then tapers off. It happens when I accelerate fairly hard and the tranny shifts and only lasts for just a brief second. It also happens when accelerating up a hill, when this happens it will do it as long as I keep my foot in it. At first I thought it might be turbo surge but now I'm not so sure. I pulled the red vacuum line off the wastegate solenoid and hooked up a vacuum pump and no matter how much vacuum I applied the rod coming out of the solenoid does not move. I also can't move the rod by hand either. Is that right? If it should move and it doesn't could the wastegate be stuck partially open maybe allowing boost to escape under load? If the actuator rod should move by hand how does a person fix it or what would be the most likely culprit? I did notice while checking things under the hood ie. CAC boot clamps, looking for leaky boots, etc. that the green vacuum line going to the intake tube coming from the air filter was disconnected so I reconnected it and it made no difference. All CAC boots appear to be in good shape and all clamps tight. Being new to diesels and turbos I am kind of at a loss hoping for the expertise of everyone on here to steer me in the right direction. Thanks in advance and sorry for being so long winded.