2001 Ranger 4-cylinder 2.5L engine, 180K miles

I have been getting PO301 for months now, on and off so it's probably not related to this one.

It started idling awfully a week ago but does not die. Some vacuum problem. I heard the PCV valve elbow is the likely problem but where it is located? A pic or a diagram would be really helpful, I did a search but keep getting 4L engine and other makes/years.

It's currently throwing P0171 code.

A code P0171 may mean that one or more of the following has happened:

• The MAF (Mass Air Flow) Sensor is dirty or faulty
  Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
• There could be a vacuum leak downstream of the MAF sensor
• Possible cracked vacuum or PCV line/connection
• Faulty or stuck open PCV valve
• Failed or faulty oxygen sensor (bank 1, sensor 1)
• Sticking/plugged or failed fuel injector
• Low fuel pressure (possible plugged/dirty fuel filter!)
• Exhaust leak between engine and first oxygen sensor

 

Leaky intake gaskets maybe?

I'm not sure about the 4-banger PVC valve location.

 

It started very suddenly. As if something broke or tore in it.

Is there a diagram I can get?

 

As to where it is on the engine, the '01 Ford Manual doesn't really show all that much: 2001 Ranger 2.5L PVC Valve

 

I have no idea where that is.

 

The search function is your friend!!! https://www.ford-trucks.com/forums/1...tec-4-cyl.html