1990 Pontiac Sunbird, I took a piece of hose going to the egr valve to try and see if it is working properly, but with car off, I can suck through, and blow out into hose going to egr valve, and it doesn't seem like there's any seal stopping air flow either way...is it supposed to, or what is this supposed to do?
won't be able to help precisely yet this is a image of it so do the the place's waldo with this hyperlink. it is in lots of situations linked to the intake manifold the PCV is on the valve conceal and all vehicles from approximately seventy 8 on have EGR's
What is it that you are trying to do? Your question is sort of vague.
It would be best if you could test the valve with a vacuum tester but from what you describe it is probably bad. The EGR has a diagram (basically a rubber disc) in it which can go bad when this happens the vacuum from the motor can no longer activate it. The biggest problem you may notice from this is you now have a Vacuum leak causing your motor to run lean. Many people would just plug the vacuum line to the valve to prevent the Vacuum leak and not worry about the valve. If you want or need to keep the emissions working on the car buy a new valve.
a good egr valve should be tested when idle. when idle, remove the hose on the egr valve and replace it with a hand-held vaccum pump. by applying pressure, the engine should idle rough or die. if so, the egr is working properly. if it doesn't respond or it doesn't hold any pressure, the egr is bad. if it holds pressure but there is no sign of rough idle, egr is clogged. (my husband is an automotive technician/smog technician)
