The vacuum system on these is subject to failure do to several things.
The vacuum pump wears out, the wastegate solenoid (LH VC at the rear)
The plastic lines break or crack.
Wastegate acutator wears out and needs service.

A turbo master will fix all these ills and you no longer need any of that anoying stuff.

Set for a max boost of 10 PSI and its off to the rodeo.

I have never used the Banks chip but the Heath chip works with the Turbo master and you will not get codes and or defuel if you have too much boost.

Very simple to install and use. Very forgiving device that just plain works.

I have one on my 95 and its just the best thing since sliced bread.


If you decide to keep the vacuum system the pump should see 26"Hg at the pump and the reading should be steady.
The reading at the wastegate actuator should be about 20"hg with engine at idle.

A code 78 will set if the solenoid has an electrical fault but normally the ecm will not complain unless it sees no boost or way too much.

Be sure the plastic lines are in good order as well as the rest of the system.

Again the turbo master is the ideal device as it is a simple rod with a spring and a couple nuts to adjust it.

Crank it down until you get 10 PSI under a hard pull (MAX) and your set.

USE A PYRO and BOOST gauge with the the TM as you are now the only thing between a heavy foot and a melted six and a half


Have fun

Best

Missy