Hello everyone, I'm trying to diagnose my P0400 EGR flow error code. Operating the EGR valve by hand bogs down engine, so valve does something. I can hear a clicking in the solenoid. I replaced the vacuum hoses and cleaned the passages to the best of my ability, but here's what I don't understand:
The two small EGR related hoses coming off the throttle body, should these be a source of vacuum at idle? I plugged a vacuum gauge into both and got 0 PSI, even thought I took off throttle body to clean the passages out. Should I be getting -20PSI that I am in other places, or am I reading this wrong?