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EGR and EVR vacuum tubes

  #1  
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EGR and EVR vacuum tubes

I noticed on my son's 96 ranger, the EGR is plugged, and one of the EVR ports are broken off and neither is hooked up. Also, the vacuum lines are completely missing. Can I simply use vacuum hose to hook this back up? Is there anywhere one can buy the green and red vacuum lines?

Also, I know the port on the top of the EVR goes to manifold vacuum, and the other goes to the EGR. Could someone point me to where the manifold vacuum port is on the manifold for the EVR?
 
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Wrecking yard is the only place you are likely to find the colored hard plastic vacuum lines, these are cheaper than the rubber lines which is why car makers use then, they are colored for easier assembly/hookup at the factory.

You can use any type of vacuum lines to replace them

EVR(EGR solenoid) will usually be hooked to the Vacuum Reservoir line, so it has vacuum available all the time
Vacuum reservoir has just two lines so EVR line will be "T'ed" to one of those

Vacuum reservoir is a black plastic ball usually located on passenger side front of engine bay, very low down, you often can't see it from the top, have to get under front to see it

There will be a vacuum line coming from upper intake running to the reservoir, it will have a Check Valve on that line that holds vacuum in the reservoir, the EVR "T" will usually be between Check Valve and Reservoir
 
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Originally Posted by RonD View Post
Wrecking yard is the only place you are likely to find the colored hard plastic vacuum lines, these are cheaper than the rubber lines which is why car makers use then, they are colored for easier assembly/hookup at the factory.

You can use any type of vacuum lines to replace them

EVR(EGR solenoid) will usually be hooked to the Vacuum Reservoir line, so it has vacuum available all the time
Vacuum reservoir has just two lines so EVR line will be "T'ed" to one of those

Vacuum reservoir is a black plastic ball usually located on passenger side front of engine bay, very low down, you often can't see it from the top, have to get under front to see it

There will be a vacuum line coming from upper intake running to the reservoir, it will have a Check Valve on that line that holds vacuum in the reservoir, the EVR "T" will usually be between Check Valve and Reservoir
Ok, great! This is exactly what I needed. Maybe this is why my heater selector isn't working either. Could be leaking vacuum where things aren't hooked up correctly. I'm thinking someone broke off the top port of the EVR and instead of replacing the EVR just blocked off the EGR valve. Any idea what size the vacuum hoses are? If not I can figure it out when I buy the new EVR.

I'll report back when I get things figured out.
 
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Yes, the Vent controls, floor, panel, defrost, are vacuum controlled, defrost vent is default/no vacuum

There is a black plastic vacuum line that runs from vacuum reservoir to the firewall, passenger side next to heater fan motor box, that line supplies vacuum for the Vents, and yes if EVR connection was left open then you could lose vacuum at Vents when accelerating, low vacuum in intake manifold

But the black plastic line would also melt or crack near the exhaust, causing same loss of vacuum in the cab

No, on the size, just take old EVR off and match its size
Also if you have the old plastic line take that in as well and get a short length of rubber hose to have on hand to splice any breaks in these lines, it just needs a snug fit, no clamps needed, as its Vacuum pressure so pulls on splices/connections, it doesn't push them apart
 
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Originally Posted by RonD View Post
Yes, the Vent controls, floor, panel, defrost, are vacuum controlled, defrost vent is default/no vacuum

There is a black plastic vacuum line that runs from vacuum reservoir to the firewall, passenger side next to heater fan motor box, that line supplies vacuum for the Vents, and yes if EVR connection was left open then you could lose vacuum at Vents when accelerating, low vacuum in intake manifold

But the black plastic line would also melt or crack near the exhaust, causing same loss of vacuum in the cab

No, on the size, just take old EVR off and match its size
Also if you have the old plastic line take that in as well and get a short length of rubber hose to have on hand to splice any breaks in these lines, it just needs a snug fit, no clamps needed, as its Vacuum pressure so pulls on splices/connections, it doesn't push them apart
Ok, thanks for the advice. It appears someone has taken the vacuum line completely off and tossed it...I don't see it anyway. But, I'll look again. I'll probably buy several feet of vacuum line and just replace them.
 
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EGR system also has a DPFE sensor with 2 hoses, they are not vacuum hoses, they are exhaust hoses, they connect on the EGR valve tube
DPFE sensor tells computer how far open the EGR valve is, how much exhaust is being added to intake
It does this by the pressure difference between these two hoses, hose closer to EGR valve will be same pressure as farther hose when EGR valve is closed, as EGR valve opens the closer hoses pressure will go down, the difference in pressure tells computer the "flow"
DPFE = Differential pressure feedback
 
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Originally Posted by RonD View Post
Yes, the Vent controls, floor, panel, defrost, are vacuum controlled, defrost vent is default/no vacuum

There is a black plastic vacuum line that runs from vacuum reservoir to the firewall, passenger side next to heater fan motor box, that line supplies vacuum for the Vents, and yes if EVR connection was left open then you could lose vacuum at Vents when accelerating, low vacuum in intake manifold

But the black plastic line would also melt or crack near the exhaust, causing same loss of vacuum in the cab

No, on the size, just take old EVR off and match its size
Also if you have the old plastic line take that in as well and get a short length of rubber hose to have on hand to splice any breaks in these lines, it just needs a snug fit, no clamps needed, as its Vacuum pressure so pulls on splices/connections, it doesn't push them apart
Replaced the EVR and realized that there is no vacuum source going to the vacuum reservoir ball. The port on the front was plugged off. I ran a vacuum line to a port on the driver side intake and it works fine. Even the heater blend door works. Where is the source line supposed to come from for the reservoir? The port I plugged it into just to try it is too big and I had to rig it up to test it.
 
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Should be hooked to the Vacuum manifold, multiple vacuum ports at one location on the intake manifold, follow Power brake vacuum hose, it should also be plugged in there.
Follow each vacuum line that's already hooked up, you should find one with a "T" that unhooked

Also look on the rad support, there should be a vacuum diagram there

Blend door is Electric on 1995 and up Rangers, it was cable operated in 1994 and earlier
Vent doors have always been vacuum operated
 
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Originally Posted by RonD View Post
Should be hooked to the Vacuum manifold, multiple vacuum ports at one location on the intake manifold, follow Power brake vacuum hose, it should also be plugged in there.
Follow each vacuum line that's already hooked up, you should find one with a "T" that unhooked

Also look on the rad support, there should be a vacuum diagram there

Blend door is Electric on 1995 and up Rangers, it was cable operated in 1994 and earlier
Vent doors have always been vacuum operated
On our truck until I hooked up the vacuum, air would only come out of the defroster. When I hooked up the vacuum ball the air would switch from defrost to vent to floor as it should.

Iíll take a look again and try to find the T. Looked today but couldnít find it.
 
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