Vacuum to EGR?
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Vacuum to EGR?
How much vacuum in Hg should the EGR be getting at part and WOT? Vacuum to the EVR at idle is like 17Hg and part to WOT it climbs to 22Hg+. Coming out and to the EGR I only get 2Hg.
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From: B/CS, Texas!!
At WOT, EGR valve should be closed. Your Idle 2Hg sounds right, since EGR should be closed at idle. EGR valve should fully open with 8inHg.
The readings you are getting to the EVR are probably from your intake. (yellow or green line...I think). Everything looks normal
The readings you are getting to the EVR are probably from your intake. (yellow or green line...I think). Everything looks normal
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Originally Posted by MemOrex
At WOT, EGR valve should be closed. Your Idle 2Hg sounds right, since EGR should be closed at idle. EGR valve should fully open with 8inHg.
The readings you are getting to the EVR are probably from your intake. (yellow or green line...I think). Everything looks normal
The readings you are getting to the EVR are probably from your intake. (yellow or green line...I think). Everything looks normal
So part throttle it's supposed to pull 8Hg? I can't get over 2Hg to it. So does this mean it's bad, or is the EEC not telling it to open fully?
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From: B/CS, Texas!!
Here's a quick test to see if the EVR and EGR are working properly:
-Find the wire harness that plugs into the EVR.(2 wires)
-If you're looking straight at the EVR, ground the Left wire. The harness has to be plugged in, so you need to backprobe the wire and ground it. (remember to tape it when you're done)
-Once grounded, vacuum to EGR should rise, it opens, and you should notice the engine wanting to stall.
-Find the wire harness that plugs into the EVR.(2 wires)
-If you're looking straight at the EVR, ground the Left wire. The harness has to be plugged in, so you need to backprobe the wire and ground it. (remember to tape it when you're done)
-Once grounded, vacuum to EGR should rise, it opens, and you should notice the engine wanting to stall.
Lead Driver
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From: Concord, NC
For what it's worth, I never could get any vacuum to the EGR valve sitting in the driveway. I had to actually drive the truck to see any vaccum (got the full 8" of Hg, though) to the EGR valve. Manifold vacuum should fall to zero at full throttle.
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Originally Posted by EPNCSU2006
Manifold vacuum should fall to zero at full throttle.
Last edited by DOHC330MustangGT; Jul 7, 2005 at 08:18 PM.
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From: Central NY
Your vacuum system seems fine.
The line to the EGR is vented to atmosphere, when egr is not turned on, by the egr valve pressure regulator and should have no vacuum on it. Since you show 2inHg then your regulator might need cleaning but I wouldn't worry about it too much.
The computer only kicks on the egr under certain conditions like steady highway driving. If you have no codes then assume its working properly. If the computer demanded it open and position sensor didn't report that the egr opened properly then it would set a code. At worst, you'll get a bit better mileage on the highway by not pumping exhaust gas back in
5-8inHg should open the egr and hold the vacuum.
Popa Tim
The line to the EGR is vented to atmosphere, when egr is not turned on, by the egr valve pressure regulator and should have no vacuum on it. Since you show 2inHg then your regulator might need cleaning but I wouldn't worry about it too much.
The computer only kicks on the egr under certain conditions like steady highway driving. If you have no codes then assume its working properly. If the computer demanded it open and position sensor didn't report that the egr opened properly then it would set a code. At worst, you'll get a bit better mileage on the highway by not pumping exhaust gas back in
5-8inHg should open the egr and hold the vacuum.
Popa Tim
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Originally Posted by Popa Tim
Your vacuum system seems fine.
The line to the EGR is vented to atmosphere, when egr is not turned on, by the egr valve pressure regulator and should have no vacuum on it. Since you show 2inHg then your regulator might need cleaning but I wouldn't worry about it too much.
The computer only kicks on the egr under certain conditions like steady highway driving. If you have no codes then assume its working properly. If the computer demanded it open and position sensor didn't report that the egr opened properly then it would set a code. At worst, you'll get a bit better mileage on the highway by not pumping exhaust gas back in
5-8inHg should open the egr and hold the vacuum.
Popa Tim
The line to the EGR is vented to atmosphere, when egr is not turned on, by the egr valve pressure regulator and should have no vacuum on it. Since you show 2inHg then your regulator might need cleaning but I wouldn't worry about it too much.
The computer only kicks on the egr under certain conditions like steady highway driving. If you have no codes then assume its working properly. If the computer demanded it open and position sensor didn't report that the egr opened properly then it would set a code. At worst, you'll get a bit better mileage on the highway by not pumping exhaust gas back in
5-8inHg should open the egr and hold the vacuum.
Popa Tim
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From: Langhorne, PA
When the EGR operates it "pulses". Every time it opens up the computer senses this and sends a signal to shut it down, the EGR won't just pop open and stay there, it operates dynamically and is adjusted constantly by the comp.
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Originally Posted by Popa Tim
you didn't say you had codes.... LOL
Time to test then.
Does the EGR valve itself open when you vacuum down the line?
Time to test then.
Does the EGR valve itself open when you vacuum down the line?
fefarms had told me to backprobe the wires to the EGR Position sensor at idle and part throttle, so I'll do that too and see what I come up with.
Anything else I should check, or look for?