EGR question
Thread Starter
4th Gear
Joined: Sep 2008
Posts: 4
Likes: 0
EGR question
I have a 85 that will not pass smog in CA. because of high NOX readings. As I have been testing the system I have noticed the EGR valve is not working at all.
I can apply vacum directly to it with a vacum pump, when it is not running and it will hold. As soon as I start it up, it will drop to zero. With it running and using the pump, vacum is zero. Any thoughts?
Thanks,
Jay
I can apply vacum directly to it with a vacum pump, when it is not running and it will hold. As soon as I start it up, it will drop to zero. With it running and using the pump, vacum is zero. Any thoughts?
Thanks,
Jay
Safety Car
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
Check out this link paying close attention to paragraph #5.
http://www.asashop.org/autoinc/dec97/egr.htm
http://www.asashop.org/autoinc/dec97/egr.htm
Pro
Joined: Mar 1999
Posts: 678
Likes: 0
From: Oslo, Norway
hi I have an 85 too. its a z-51 4+3 manual.
I had an idle issue and searched for everything and went through the EGR. I had a faulty valve. The valve can be stuck or open. I think it is possible to see by applying vaccum if the valve opens or not. There can be debris on the valve seat not making the valve closing.
Another thing is. Does the EGR solenoid work properly. If you have the repair manual. Do go throught the procedure and see if it works alright. And also check if the vacuum lines are not broke because those stiff ones under the plenum is very sensitive for brakage because they are so old. I had a couple that was broke. good luck
The EGR solenoid is placed on the right side of the engine back near thewall.
I had an idle issue and searched for everything and went through the EGR. I had a faulty valve. The valve can be stuck or open. I think it is possible to see by applying vaccum if the valve opens or not. There can be debris on the valve seat not making the valve closing.
Another thing is. Does the EGR solenoid work properly. If you have the repair manual. Do go throught the procedure and see if it works alright. And also check if the vacuum lines are not broke because those stiff ones under the plenum is very sensitive for brakage because they are so old. I had a couple that was broke. good luck
The EGR solenoid is placed on the right side of the engine back near thewall.
