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EGR vacuum line was purposely plugged...?

 
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Old 05-21-2015, 09:10 PM
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Icon5 EGR vacuum line was purposely plugged...?

So just curious, why would someone intentionally plug the vacuum line coming off the EGR valve?? Checking the lines for a vacuum leak, I discovered that there was some plastic jammed in at one of the hose ends, so I unclogged and reconnected it thinking that might be why I'm throwing code 12 (egr lift valve sensor). Then when I drove next it stalled on me in drive. Plugged it back up and it was fine for a couple days but ive been battling the stall for about a month now, not sure if thats a timing coincidence or if the EGR could even cause a stall....
Anyway I've been researching all over, so I can find other threads about my problems.
I just wanted to know why the heck someone would block off the EGR line like that, any ideas? What consequences would doing that have potentially?
These are questions i have searched all over for but haven't found anything specific enough, so I figured I'd ask for once.
Btw its a 92 si h23a automatic.

Last edited by tontontiger13; 05-21-2015 at 09:12 PM. Reason: reworded segment for clarification
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Old 05-22-2015, 09:54 AM
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Re: EGR vacuum line was purposely plugged...?

I would have no explanation for why in the world someone would clog a vacuum line. I wouldn't think it was purposely done maybe it was just clogged once bought and put on. I don't think their is any potential to do so. I do know how important the whole EGR system is to be working properly because it can do a intense change in how the car runs. Did you check the whole EGR system? by that I mean EGR valve , lines , EGR ports, senors, etc? I have a 5gen and my old EGR valve would make the car start to stall once it opened. GL trying to figure out the problem I know how much of a head ache the EGR system can give you
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Old 05-22-2015, 10:50 AM
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Re: EGR vacuum line was purposely plugged...?

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Originally Posted by tontontiger13 View Post
I just wanted to know why the heck someone would block off the EGR line like that, any ideas? What consequences would doing that have potentially?
These are questions i have searched all over for but haven't found anything specific enough, so I figured I'd ask for once.
Btw its a 92 si h23a automatic.
You may want to make sure that the EGR diaphragm doesn't have a hole in it. If it does, then connecting that vacuum line to it would essentially be the same as leaving it unconnected and you would get a stall situation like you are describing. You will need to find a way to pull a vacuum on that EGR vacuum port. You can do this with the car off so you can possibly hear any leaks. (You may or may not be able to hear it, depending on how severe it is) The EGR should open when you put vacuum on that port and it should stay open as long as the hose to the port and vacuum source aren't leaking. If it closes, you have a leak and will probably need to replace the EGR. I am thinking that if the EGR is leaking, and you replace it and reconnect that hose, then your EGR code SHOULD go away because even with a vacuum hose connected to it, and opening it when it is supposed to be open, it probably wouldn't be opening as much as the ECU expects it to and would throw a code.

Let us know what you find or if you have further questions. I'd be intersted to know if that is the issue.
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Old 05-22-2015, 11:36 AM
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Re: EGR vacuum line was purposely plugged...?

In my '84 t-bird the egr valve would not close all the way when soot built up. This caused the car to wonder if there was a for real vacuum leak as at times it would close, other times it would not. Cleaning it helped some but it's soft metal wore in time from 'wire brushing' it. That lead to a permanent leak. Unpredictable acceleration at best. Bogging to shut off at worst.
Chinese after market stuff did not exist back then. So you were at the mercy of your local stealership for new units.
At $450+ that was a house payment to a this young, raising a family type. Food or EGR valve?
After a while I put a golf tee in the hose and the problem was gone.
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