1990 Ranger Vacuum lines
Thread Starter
|
Member
Joined: Dec 2016
Posts: 7
Likes: 0
From: Hillsborough
1990 Ranger Vacuum lines
I just bought a 90 Ranger. It does have character :)
I have a 2.9l vin 1ftcr10txlub11512.
Notice in the diagram part number I9A563. That is a vacuum check valve.
There is/are two vacuum lines attached to the check valve.
Both are disconnected/broken/melted/open ended right now.
The diagram shows where one of the lines is supposed to connect. I actually found this one.
The diagram shows the opposite end with no vacuum line connected.
This is what I need help with.
There is a vacuum line on mine that connects to the open end in the diagram and it is routed through a rubber housing on the firewall to the other side of the engine. Its just dangling there. I cant find where it is supposed to be connected.
Any help is appreciated !
Thanks in advance !!!
I have a 2.9l vin 1ftcr10txlub11512.
Notice in the diagram part number I9A563. That is a vacuum check valve.
There is/are two vacuum lines attached to the check valve.
Both are disconnected/broken/melted/open ended right now.
The diagram shows where one of the lines is supposed to connect. I actually found this one.
The diagram shows the opposite end with no vacuum line connected.
This is what I need help with.
There is a vacuum line on mine that connects to the open end in the diagram and it is routed through a rubber housing on the firewall to the other side of the engine. Its just dangling there. I cant find where it is supposed to be connected.
Any help is appreciated !
Thanks in advance !!!
The round ball or tank is called the Vacuum Reservoir(vac res).
It uses a check valve to hold vacuum when engine is accelerating(vacuum in intake drops low), or when engine is off.
Sometimes check valve is part of the reservoir and sometimes it is a separate part.
The reservoir is connected to the intake manifold of course, the vacuum source
And then it is always connected to the cabs Vent controls, line runs to the firewall and into the cab where it is connected to the Vent control panel on the dash, this operates defrost vent, floor and panel vents, defrost is default vent position, so no vacuum = defrost.
(there are often TWO vacuum lines at firewall, the other one goes to heater hose valve, it controls flow thru heater core, this also uses the vacuum from reservoir via vent control panel)
The reservoir may also be connected to EGR solenoid, computer sends vacuum to the EGR valve to open it, so it needs a stable vacuum source, especially during acceleration when EGR is needed most.
EGR solenoid will have electrical connector and TWO vacuum lines connected, one line will come from EGR valve.
1990 2.9l may or may not have an EGR valve
It uses a check valve to hold vacuum when engine is accelerating(vacuum in intake drops low), or when engine is off.
Sometimes check valve is part of the reservoir and sometimes it is a separate part.
The reservoir is connected to the intake manifold of course, the vacuum source
And then it is always connected to the cabs Vent controls, line runs to the firewall and into the cab where it is connected to the Vent control panel on the dash, this operates defrost vent, floor and panel vents, defrost is default vent position, so no vacuum = defrost.
(there are often TWO vacuum lines at firewall, the other one goes to heater hose valve, it controls flow thru heater core, this also uses the vacuum from reservoir via vent control panel)
The reservoir may also be connected to EGR solenoid, computer sends vacuum to the EGR valve to open it, so it needs a stable vacuum source, especially during acceleration when EGR is needed most.
EGR solenoid will have electrical connector and TWO vacuum lines connected, one line will come from EGR valve.
1990 2.9l may or may not have an EGR valve
Last edited by RonD; Dec 29, 2016 at 02:03 PM.
Thread Starter
|
Member
Joined: Dec 2016
Posts: 7
Likes: 0
From: Hillsborough
The round ball or tank is called the Vacuum Reservoir(vac res).
It uses a check valve to hold vacuum when engine is accelerating(vacuum in intake drops low), or when engine is off.
Sometimes check valve is part of the reservoir and sometimes it is a separate part.
The reservoir is connected to the intake manifold of course, the vacuum source
And then it is always connected to the cabs Vent controls, line runs to the firewall and into the cab where it is connected to the Vent control panel on the dash, this operates defrost vent, floor and panel vents, defrost is default vent position, so no vacuum = defrost.
(there are often TWO vacuum lines at firewall, the other one goes to heater hose valve, it controls flow thru heater core, this also uses the vacuum from reservoir via vent control panel)
The reservoir may also be connected to EGR solenoid, computer sends vacuum to the EGR valve to open it, so it needs a stable vacuum source, especially during acceleration when EGR is needed most.
EGR solenoid will have electrical connector and TWO vacuum lines connected, one line will come from EGR valve.
1990 2.9l may or may not have an EGR valve
It uses a check valve to hold vacuum when engine is accelerating(vacuum in intake drops low), or when engine is off.
Sometimes check valve is part of the reservoir and sometimes it is a separate part.
The reservoir is connected to the intake manifold of course, the vacuum source
And then it is always connected to the cabs Vent controls, line runs to the firewall and into the cab where it is connected to the Vent control panel on the dash, this operates defrost vent, floor and panel vents, defrost is default vent position, so no vacuum = defrost.
(there are often TWO vacuum lines at firewall, the other one goes to heater hose valve, it controls flow thru heater core, this also uses the vacuum from reservoir via vent control panel)
The reservoir may also be connected to EGR solenoid, computer sends vacuum to the EGR valve to open it, so it needs a stable vacuum source, especially during acceleration when EGR is needed most.
EGR solenoid will have electrical connector and TWO vacuum lines connected, one line will come from EGR valve.
1990 2.9l may or may not have an EGR valve
Yes, main function of reservoir was Vent control in the cab, not heat or AC, just where the air comes out when fan is on, i.e. floor vent, windshield vent(defrost), or panel vent.
The flaps for these all use "vacuum motors"
Defrost vent is when there is no vacuum, motors off
Diagram here: http://ww2.justanswer.com/uploads/AU...rer_vacuum.jpg
Yellow is heater hose valve control, usually a grey line on Rangers
Top is the line that runs thru firewall and to reservoir/check valve, usually black line
Blend door is electric, just FYI
The flaps for these all use "vacuum motors"
Defrost vent is when there is no vacuum, motors off
Diagram here: http://ww2.justanswer.com/uploads/AU...rer_vacuum.jpg
Yellow is heater hose valve control, usually a grey line on Rangers
Top is the line that runs thru firewall and to reservoir/check valve, usually black line
Blend door is electric, just FYI
Member
Joined: Jul 2025
Posts: 1
Likes: 0
If u look under the hood finds your gas throttle you will find where your sparks plugs are on the driver side there's a little piece that hangs down in the middle that you have to look very closely to see that's where that line goes it took me 3 days to find it I thought it went on the side of my engine cover and then I realized that when I was doing my spark plugs that I made it come loose with my hand when I was putting my last spark plug in I don't not this helps but hopefully you can find it.. you have to put it on from the back side of your motor
Member
Joined: Jun 2018
Posts: 2,365
Likes: 393
From: Everett, WA
If u look under the hood finds your gas throttle you will find where your sparks plugs are on the driver side there's a little piece that hangs down in the middle that you have to look very closely to see that's where that line goes it took me 3 days to find it I thought it went on the side of my engine cover and then I realized that when I was doing my spark plugs that I made it come loose with my hand when I was putting my last spark plug in I don't not this helps but hopefully you can find it.. you have to put it on from the back side of your motor
You have a different engine than the OP so your description of the location is wrong.
OP has 2.9 V-6, you have a 2.3 4cyl.
Thread
Thread Starter
Forum
Replies
Last Post
Mwh_12
General Ford Ranger Discussion
1
Nov 8, 2019 04:46 PM
