Loud air escaping sound from under hood. 1992 Mitsubishi 3000gt VR-4

Maintenance/Repairs
1

I have a 1992 Mitsubishi 3000gt VR-4 (Twin turbo)

Last night I was driving… not even pushing my car or anything. I go through 1st gear fine, then when I hit second, out of nowhere I hear this loud air escaping sound come from under the hood around 3000rpms. As I went up in rpms, the sound just got louder, so I shifted quick.

It sounded like if I just tried to go through it, it would explode or something. I looked this up and found somewhere it said to try tightening the clamps on everything under the hood, so I did that. None of them were loose but I did tighten them a lot.

I also looked at my (boost?) gauge (gauge on the far right in the car) and it seemed like it was stuck at halfway and moved very little when I was driving. I was going to have a person try to feel where the air was coming from when I revved it in neutral but it doesn’t seem to do it in neutral…

Never heard it before and I need to figure this out as soon as possible. Trying to sell my car and this happens… Any help is appreciated. Thanks.

2

sounds like the wastegate may be stuck open.

3

Here is the sound… uploaded it. http://imageshack.us/clip/my-videos/98/gut.mp4/

As soon as I hear it I let off the gas. If I stay on it, it only gets louder…

4

I agree with FoDaddy. If it is not the wastegate itself it is the actuator or vacuum line connected to it that is causing the malfunction in the wastegate.

5

Is it safe to drive around as long as I try not to get into the high rpms? Until I get it fixed

6

Fixed… Cable for the turbo was loose just about popped off… got a mechanic to figure it out and tighten it. Thanks for the help