MAF issues

[rumblecloud]

I've been having MAF issues lately and could use a little push.
It started a week or so ago. It would start and immediately stall. Code was 157, low voltage, mass airflow sensor. I removed it, cleaned it with MAF spray. Checked the air filter and hoses to ensure there were no obvious leaks or blockages. Swapped out a couple of other sensors I had from the Pull-a-Part with some varying success. Finally just bought a new one. It still stalls immediately after start-up. If I disconnect the MAF, It runs rough, but runs and is driveable.

How do I check the voltage? I think one lead goes to ground and the other to one of the four pins. But what should the voltage be? And is there anything else I should be looking at?
Thanks

 

[rumblecloud]

Well...what does any self-respecting wannabe shade tree mech do when he's stumped (see what i did there...shade tree/stump....
He goes to Google, which of course, led me right back here -- go figure.
Led me to this post from 2022.
I cut a new gasket from some Felpro i had. Cleaned up the mating surfaces. Put the old MAF back in and...it started a stayed running. Went for a short ride and things seem ok.

Not saying it's fixed yet, but it looks very promising.

 

[rumblecloud]

...Well, one month later still chasing this issue.
Found an old post specific to a Ranger 4.0 (from the venerable RonD (miss you mister).
Using that as a base, I started checking the voltages. Everything checked out. In doing this I noticed that the EVTM is showing me different locations in the plug at the MAF for the wiring.



The feedback wire and the ground wire for the MAF are reversed positions according to the EVT. I've never changed any of the wiring positions. The truck's been running fine until just recently.
I get continuity from both the feedback (Blue/red) wire and the ground (tan/blue) wire (for the sensor that is) so I am not sure what to do.

I do get battery voltage from the Red and Black wires.

Since it's been running like this for 30-some years, I'm guessing it's kinda ok to leave it. But I still don't know how to proceed. The feedback (Blue/Red) wire reacts just as RonD described.

Finally...AAAAARRRRGGGGHHHHHH!!!