[mpumas]

For mwenz33, vacuum to the egr valve comes from the egr solenoid which is controlled by the ECU based on inputs from the coolent temp, engine speed, speedometer and map sensor. So off idle, you will not see vacuum, however, you can force the solenoid valve by disconnecting P4 on the control box (near the engine compartment fuse box and connecting 12 v + to black/yellow wire and neg to the pink. (Connect to the wires going into the control box only.) The valve should acutuate with about 8 " of vacuum. To test the EGR valve, connect a vacuum pump to the egr and draw 8" of vacuum. Clamp the line and see if the vacuum bleeds off. If it does, it is a leaky valve. Also with the engine running, pulling a vacuum on the egr valve should cause the engine to run very rough or stall. To see if the egr valve is moving full travel, the easiest way is to probably remove the valve and pull a 8' vacuum and see if valve completley opens. You can also check the egr lift sensors but it requires a harness to get to the wires so you can hook up a voltmeter.