Jinx099

I'm trying to hook up the switching solenoid valve and the relief solenoid valve on my '87 GXL without installing the rats nest (just vac lines and solenoids), and I'm having trouble following the vacuum diagram in the FSM. I am looking athe colorized version that can be found here: http://mazdarx7.iougs.com/faqvacuum.shtml

That version helps, but the red line is still way too confusing. So has anyone created a simplified version of the vacuum diagram?

If no, can anyone describe how to hook em up? Am I correct in thinking that all of the red lines are essentially just pulling vacuum from the front of the dynamic chamber? If yes, that would be simple to hook up, except for the check valve being thrown into the works. Which way is the check valve supposed to be oriented and what should be going through the check valve?

Help would be much appreciated, thanks in advance.

HAILERS2

Yes, the red line is pulling vacuum from the BOTTOM of the three nipples on the front of the dynamic chamber.

So the FLOW of air is from the solenoids TO the bottom nipple on the chamber.

Make sense or not?

And take careful note of which nipple on the solenoids the vacuum line is connected to on those two solenoids. It's a different nipple for each. Makes all the difference in the world.

Jinx099

That makes sense. What about the check valve though, is it even necessary? I assume it should be oriented such that air should be able to flow from the solenoid(s) to the dynamic chamber, but which one(s) should be flowing through it? All, some, 1, or does it really matter (on an N/A)? If it matters, which one(s)?

HAILERS2

The solenoids are either electrically shut or electrically open.

The RELIEF solenoid.........if the car is idling that valve on a series four non turbo is energized so that it passes vacuum thru that solenoid so it can pull a vacuum on the ACV (air control valve) relief diaphram.

The SWITCHING solinoid........if the car is idling that valve is de-energized and passes vacuum thu it to the ACV's internal switching solenoid.

This sounds contadictory.............but remember what I said in the first post? these two solenoid valves are configured differently even though they are exactly the same type valve.

By configuring I mean........the FILTER on those solneoids can be pulled off by hand and put on any of the three nipples on a solenoid. The end result in doing this is that when you energize a solenoid the path thru the solenoid will change depending on which nipple the hoses are attached to and where the filter is located on the solenoid.

The jpg attached are out of the FSM and show those two solenoids. Notice how on the Switching solenoid what nipple the filter is on and then look at the Relief solenoid and notice how the filter is on a different nipple. Makes a difference where the hoses/filter are as to what happens when the thing is energized or not energized.

All those solenoids have power anytime the key is ON. What makes them work is the ECU putting a ground on the wire that is NOT black/white on their electrical plug.

Why the check valve? I'm not sure. I guess I need to go play with one to find out why it exists. Like you noitced, the vacuum or air flow is always towards the dynamic chamber or in other words pulling a vacumm on the solenoids all the time the engine is running. Whether that vacuum goes all the way to the ACV depends on if the particular solenoid is energized or not. IF not energized I always ASSUMED that the guts of the solenoid just deadended the vacuum coming from the dynamich chamber (in other words no vacuum *leak* ever).

EDIT: Notice how the filter is next to the elect connector on the Relief but on the Switching the filter is on the end of the solenoid opposite the electrical connector.