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Did you check the basics? Stuck closed would indicate electrical connector left off or vacuum line left off. The P1443 would suggest vsv was not working, is the vsv plugged in? If it is, try doing and active test with the vsv plugged into a noid light, I have had two of these with a failed ecu circuit not powering the vsv. Active test can only be preformed when the car is cold, to prevent damaging the catalytic converter.
Any luck with this vehicle? Were you able to confirm everything was connected?Or were you able to confirm noid light operation from vsv connector?
Let me look for a diagram of this.....
Plastic manifold or aluminum on this?
Intake manifold that is
OK below Ive attached a picture of VSV's with hoses. Please confirm that the hoses from the air valves connect to the lower port of vsv's as shown. Also confirm top port of vsv's connect to metal line. Fuel pressure damper hose connects as shown( this is not actual a vacuum port so may be why vsv's didn't work if they wer connected to it). The red arrow rubber vacuum line from vsv to drivers side of intake box( cant find an actual picture of connection). Let me know if this is how its all connected now. I'm looking a picture of vsv vacuum port connection now.....
I guessing this is a customers car? With a return problem like this, I usually try to get the customer to let me keep the vehicle for a few days and drive it to complete a few drive cycles from a cold start, just to confirm that the issue was resolved. If you have any other follow up question regarding this issue please let me know. Thank you for using just answer.