u/GCS69

This thermal vacuum check valve shuts off vacuum to my fuel pressure regulator and other vacuum lines when my engine is warm. ( There’s vacuum when the engine is cool) When I look up thermal check valve, all I get is the bigger one that’s by the valve cover.

Anyone familiar with these symptoms? Is this normal behavior? Is this a common failure in the unit or is it receiving a signal it shouldn’t? Any help is appreciated.

Does anyone have a diagram or know which pins go to what on the ecu? I’ve been having starting and idling issues and I’m pretty certain it’s a sensor/ electrical issue at this point. I’ve replaced almost every sensor under the hood with no avail. I’ve also tried 3 different ecus so I know that’s not the issue. I want to test the wiring and was hoping I could just test it all from the ecu harness.