Could anyone with a T1 tell me how the transducer for the egr is hooked up. I think the previous owner messed it up. :bang head He had the source from the solenoid connected to the check valve that Y's to the egr valve and the transducer. I'm pretty sure this was wrong. Hooked a vacuum pump to the open port on the transducer, and the engine stumbled whenever I put vacuum on it. This, I believe, is correct testing procedure. So I pulled off the factory vacuum source from the check valve and put it on the open port of the transducer that I tested. Still having some pinging though, and I know bad EGR can cause this. Thanks ahead