[Tarana]

What is this and what does it do, its on a 1999 2.8t diesel.
should i be able to open and close it by hand, it seems jammed? its some sort of valve

cheers

 

[camo75]

Pretty sure thats your wastegate which opens to limit the amount of boast your engine receives
If the boast goes over the factory pre set level (11.5psi i think) it will open.
If your concerned its siezed maybe remove the clip and see if the gate moves freely without the actuator attached.
I think you need a vacuum pump to test the actuator though but others here might be able to comfirm that.

 

[TAZMAV]

x2. What he said

 

[2jz929]

You should be able to move it by hand, but it will be quite difficult. If you grab the shaft with pliers and lever off the housing it should move though.

 

[Troys 5.7 GU]

Just did mine and got it moving freely. Does yours overboost? At high revs.