Just when I thought it was safe to go back in the water here comes my old friend P0243 code. Turbocharger circuit A. I posted a few days ago that the problem was resolved when I discovered a rusty nipple on the wastegate that was making for a poor vacuum seal. It did work for awhile but code reappeared.

Here's what I've done so far. I checked vacuum at the inlet line from the main vacuum line to the EGR and had 27" steady at idle. Wastegate line, 5" at idle. Made me think a cracked line from the wye to the wastegate solenoid, so I jumpered it with a test line and same thing.

Next I swapped lines into the wye so as to exchange the line to the EGR and wastegate. Same thing, wastegate 5", EGR 27".

Finally I just connected a direct line to the wastegate solenoid to the main vacuum line and temporarily eliminated the wye and got 27" at the solenoid.

So my questions are: If its just a simple wye in the vacuum line why is there a difference on the wastegate side being lower? Does anyone find a similar difference in their vacuum at these points? If so, why, and what should proper vacuums be at these points?

Finally I have re-installed the wye with both lines hooked up properly and no codes yet but only a few miles under my belt so far.

As my Dad would say, "I don't think I understand everything I know about this device".
Any help and guidance would be appreciated, because I'm not too optimistic that the issue is resolved.