Originally Posted by Z_ealot

just an update, but I decided to disregard the maf sensors for now and look at the main issue which is the fuel trims indicating a lean condition. decided to start with the simplest thing I could think of which is the vacuum hoses and pcv hoses and valves. brake booster hose and all other hoses connected to the intake manifold or had anything to do with vacuum checked out visually OK so moved on to spraying around each hose to see if that did anything....nothing. lastly decided to pull off the hoses for the pcv valves and guess what I found.....a nice little puddle of oil on the connectors where the pcv hoses meet with the intake manifold. pulled the hose off the pcv valve itself and same thing so popped one of the pcv valves off for testing and here's the video of what I found.....



if I remember right from reading around these valves shouldn't be hissing like that and there should be next to no suction at idle if the valve is operating correctly, can anybody confirm this or am I getting faulty information?

P.S.

when holding the valve in my hand I can feel vibrations coming from it while vacuum is being applied to it.