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Just put it in where you put the oil.. it is the same thing. If you remove the PCV, under the plastic cover that 1/4 turns, then you have to replace it, or take a chance oif having a big vacuum leak through the seal.
Fairly normal. But you could check the plug, fuel and air filter, PVC valve, and all the normal things you check with an annual tune up. You could also check and clean the air mass sensor. It often gets coated with PVC foam.
If the air mass sensor gets coated with foam from the PVC, then it won't increase the gas supply when you open the throttle, because the foam insulated the heat element in the sensor. Just take it off and clean it will any sort of degreasing spray, then put it back on. At this age, you should probably consider splicing a condenser into the PVC hose, to take out oil and water vapors.
If that does not work, it could be the temperature sensor or O2 sensor. When sensors go bad, they usually go to 0 or infinite ohms with an ohmmeter.
Running rich can be from a bad sensor, such as O2, mass air, temperature, throttle position, etc., which would effect all cylinders and run smooth. Or from a bad plug or wire, bad compression, etc., which would not effect all cylinders and run rough.
The most common with this age, would be PVC blowby foam coating the air mass sensor. Just take it off and clean it. Then splice long hoses into the PVC, and run it down to a metal container that get cold in the wind, to condense out the oil and water vapors before it gets into the intake.
Your oil pressure is perfectly fine. On new vehicles, oil pressure can even drop below 10 at idle, and to above 40 when at high RPM.
All it is saying is that it does not like the air/fuel mixture. That can be from fouled spark plugs, an open gas cap or other intake leak, a bad O2 sensor, PVC foam on the air mass sensor, throttle position sensor, etc. It is just like any carb engine when the mixture is bad. You can't just read a number and know what to replace. You have to have a feel for the symptoms. And if there are no other symptoms, it could be the code is simply the only thing wrong.
Personally my best guess would the air mass sensor. Look the inside of the oil cap. If there is foam there, then there is likely foam in the air mass sensor as well. PVC systems always throw foam into the sensor, and the only solution is to splice longer hoses into the system and into a condenser of some sort. This is worse in northern climates, in the winter. Most cars in cold conditions have this happening all the time. But as long as the light goes off eventually, don't worry about it.
No there could be a number of reason, bad gas, pvc valve needs to be replaced, fuel filter plugging up, egr valve sensor needs to be replaced or the oxygen sensor . Best to have a diagnostic done before replacing a lot of expensive parts. Takes the guess work out .