A few additional notes:
The fuel pump in my car runs whenever the ignition is on. It's been like that since I bought it 12 years ago. I know it isn't supposed to work that way, but I never got around to tracing the reason for it.
I didn't just clean the WUR - I disassembled it completely and cleaned the entire thing out. As soon as I reinstalled it the cold pressure showed 20psi. It definitely showed zero before. I think the diaphragm in the WUR was sticking open. System pressure remains around 70 psi.
According to
http://jimsbasementworkshop.com/CIS/Testing/wur_specs.html the cold pressure for my car should be either 1.4 bar (20 psi) or 0.8 bar (11.5 psi), depending on the WUR. I'm going to double-check the part number, but I believe my WUR is .033. It was about 55 degrees in my garage at the time I checked the pressure. I've checked it two or three times since then, it's been consistently 20psi.
I'm going to look into the air leak suggestion next.
I did pull one injector this morning and it patterned well. I didn't have the time to pull any other injectors.
What about the AAV? It's not exactly easy to get to, but could that be causing a problem?
- Damion