So I'm late on my emissions test already and I have a service engine light soon. Pulled codes from my car and got..

P0325 knock sensor bank one
P0446 evap vent solenoid

I tried cleaning the evap black box but the code came back the pressure apparently is not up to spec 3.36- 3.40, it's at 3.28. What can I do from here to fix?

 

http://boredmder.com/FSM/Nissan/Maxima/1998/ec.pdf ---- FSM Pg 288

Did you remove the solenoid and clean it? It says in the FSM that if a certain spot is rusted, to replace the unit. Not sure how far you took it down to clean it, but if you didn't take it all the way apart, it's likely not 'clean' enough.

Here's a link - in case you do need to replace it.
http://www.google.com/products?hl=en...-8&sa=N&tab=wf

Doesn't look cheap, but if ya need it, ya need it.

G'luck!