I'm using the 85 13B FSM to check the pressure regulator control solenoid valve (page 4B-68).

Well, the results are reversed.

In the manual it says when I blow through it, the air should come out the little air filter. When I blow through it, it comes out of the vacuum connector instead.

In the manual it says when I blow through it with bat voltage applied, the air should come out of the vacuum connector. When I blow through it with bat voltage applied, it comes out of the little air filter.

Huh? Is the FSM wrong? Or did the solenoid functions got reversed somehow.

 

couple ideas.

it is possible there is an error in the book. there are also 2 different solenoids, and you guessed, which port is open, is the difference.

the pressure regulator is pretty simple, when the engine is running it should see manifold vacuum, so you could tee a pressure gauge into the line, and it should move with intake vacuum.

except when the car is started hot, then the solenoid is turned on, and the regulator sees atmosphere for 30 seconds or so.

so you can check it that way too. if the regulator isn't seeing vacuum, it'll be rich when you're not a WOT

 

Sounds good, will try that. By pressure gauge you mean vacuum gauge, yeah?

Oh, and I just looked over the test procedures for the 2nd gen pressure regulator control solenoid valve, and these ones are the opposite of the 85 FSM, and instead perfectly match the results of my test, so I think it's a safe bet that the '85 FSM is wrong.