Hi Mark,

Thanks for your reply. There is nothing on the pipe from the valve to the manifold, nor is there anything on the pipe from exhaust to valve. The only connector I don't understand connects to a device on the bottom of the intake manifold, is blue in color, and has a vacuum lead to the device as well. All the other connectors I think I understand (knock sensor, oil pressure, coolant temp, etc). This two prong blue one I don't know what it is for, could this be the sensor and connector to EGR, even though lower on the manifold than where the steel EGR pipe comes in?