onehotpocket
Member
Hello all,
Can you give the attached clips a quick watch?
https://youtu.be/dp28Aq8qt_0
The first is manually actuating the VNT actuator with a handheld vacuum pump. I have two questions about this:
Is the relative motion between the actuator and turbo arm something that needs to be addressed? It seems excessive to me, but maybe it wouldn’t cause any issues.
- The actuator return spring seems to be unable to completely return the arm, as shown in the video when I physically finish returning the arm with my hand. This is the only point in the arm’s stroke that feels “sticky” to me.
https://youtu.be/toH1oPwJRDQ
The second video is using the same pump to pull vacuum on the VAC port of the N75 valve. As you can see, it bleeds off vacuum almost as quickly as I can pump it. Is this normal? Plugging the N75’s vent line made almost no difference.
I’ve been having intermittent overboosting issues since purchasing my Golf a year ago. It is now happening multiple times every drive and seems to be worse in the cold weather. The only overboost-reprieve I’ve managed is a bit of spray lubricant on the VNT arm and some hand valve actuating for a few minutes. This made the overboosting go away for a full two weeks before returning worse than ever.
Thanks for any help,
David
Can you give the attached clips a quick watch?
https://youtu.be/dp28Aq8qt_0
The first is manually actuating the VNT actuator with a handheld vacuum pump. I have two questions about this:
Is the relative motion between the actuator and turbo arm something that needs to be addressed? It seems excessive to me, but maybe it wouldn’t cause any issues.
- The actuator return spring seems to be unable to completely return the arm, as shown in the video when I physically finish returning the arm with my hand. This is the only point in the arm’s stroke that feels “sticky” to me.
https://youtu.be/toH1oPwJRDQ
The second video is using the same pump to pull vacuum on the VAC port of the N75 valve. As you can see, it bleeds off vacuum almost as quickly as I can pump it. Is this normal? Plugging the N75’s vent line made almost no difference.
I’ve been having intermittent overboosting issues since purchasing my Golf a year ago. It is now happening multiple times every drive and seems to be worse in the cold weather. The only overboost-reprieve I’ve managed is a bit of spray lubricant on the VNT arm and some hand valve actuating for a few minutes. This made the overboosting go away for a full two weeks before returning worse than ever.
Thanks for any help,
David