[98GreenMachine]

Originally Posted by billyrb

I'm going to buy a fuel pressure test gauge this weekend. For vacuum leaks, I found the one port (mentioned above) that doesn't have a line connecting to it, but I wasn't sure if that port was to vent to the air or not (can't find any diagrams or images of it anywhere).

For timing, I checked under the hood and it doesn't say what it should be (Vortec engine).....only says timing is controlled by the computer, yadda yadda yadda. Does anyone have the spec?

On the 96+ engines, you cant adjust the timing the old way with a timing light. You would need a scanner that reads the Camshaft Position Sensor retard value. This value must be +/- 2* off of 0*. You adjust this by turning the base of the distributor slightly one way or the other. The camshaft position sensor in conjunction with the crankshaft position sensor is what determines the timing on these engines.