? What Vacuum is this ? ('88 2.3L)

[joenorthcarolina]

Doing a Mustang Intake swap on my '88 Ranger 2.3L with the relocated Idle Air Control Valve. While doing so I pulled these 2 little vacuum switched solenoid things loose from my inner fender. They were held in place with a dry rotted rubber mount. The 2 vacuum lines (Red & Green) are harnessed with a 3rd vacuum line (black) which is on the top of the air filter box. They all run from the top of the OLD intake.
Since I've not completed extending my Idle Air Control Valve wiring I'm not sure if the truck will run without these Solenoids connected. I was hoping they were just some Cruise Control switches or something un-important.
Can I proceed without these for the time being ?
Thanks

 

[SenorNoob]

IDK why one would go to the filter box, but I'm fairly sure one of them goes to the EGR valve.

 

[adsm08]

The first one is for the EGR valve, red valve to the intake, green to the EGR valve if IIRC.

The ones on top of the air box, well I never did really figure out what those were for. It will run without them.

 

[joenorthcarolina]

The first one is for the EGR valve, red valve to the intake, green to the EGR valve if IIRC.

The ones on top of the air box, well I never did really figure out what those were for. It will run without them.

LOL...
Thanks guys, I've had multiple people say they are the EGR switches. I just can't figure out why mine has two and later models have one.

 

[zekew64]

adsm08 is actually wrong. The vacuum lines that run to the EGR are for controlling the EGR when the truck is cold vs. hot. Once the truck warms up, the O2 sensor sends a signal to the vacuum solenoid that the red and green lines hook into; that solenoid opens up the vacuum switch, which in turn opens up the EGR valve to let in warm exhaust gas to be reburned.

While the truck will run with those vacuum solenoids disconnected, you might actually get worse gas mileage if they are left disconnected. Also, the vacuum lines on top of the airbox are for the same thing, only there is a heat-activated switch that stays closed while the truck warms up, then opens to let in cool air into the air box. This is to allow a more uniform air temprature of the air going into the intake. The MAF sensor monitors this, as cold air is more dense, and thus, flows slower.

 

[kimcrwbr1]

I am thinking the vacuum line that goes to the air filter box is just for the egr relief vent? When the computer tells the egr to close it pulls filtered air through the egr solenoid. The newer EVRs have the filter built right into it. It keeps the solenoid from plugging up.

 

[kimcrwbr1]

I am looking at the vacuum diagram for a 88 2.3 and it shows two egr solenoids a map the fuel pressure regulator and the preheater door. The preheater duct from the exhaust manifold to the air box has a vacuum motor and the vacuum goes through a bimetal valve. Just cap the vacuum to the filter box at the manifold tree it probably dont work anyways. Your radiator support has a vacuum diagram on it or should. Mine is a late 83 model but has the vacuum diagram for the 1984 model so look at the diagram under the hood to confirm your vacuum system. The 89 had only one egr solenoid