Hi Everyone. Heres my problem, check engine light, shooting a code 12, a buddy told me if i took a vaccum hose and plugged it into the egr valve it would tell me what part is bad, the vacuum system or the valve itself. well i did it and my car began idling ROUGH and almost dying. WHat does this mean? Should i buy a new valve altogether or try to clean mine? Thanks!!

 

Also can someone link me a diagram? I know theres a search bar but with my luck ill pull up the wrong diagram and destroy my car

 

Apply vacuum. If dies or drop more than 50 rpm then your valve is ok. If it holds vacuum and u can see the diaphragm go up but car has no change in idle then your egr passages needs to be clean out by disassembling and clearing out your ports.

 

I applied vaccuum and it idled rough but didnt die. Im guessing my valve is fine, is there a way to test the other parts of egr? Thanks

 

Could be one of the two solenoids on the fire wall or false lift readings on your egr but I doubt that.
Here is a link how to test. It's really easy. All you need is time,a vacuum gauge,pump and volt meter.
I would first try and apply 8 Hg vacuum and test the two wires for what voltage it's al first at idle and vacuum applied.

One useful thing I did in the field is book up a long vacuum line connected to a gauge while driving and leaving it on my windshield and inspecting how much vacuum the solenoid is pulling, if it works but no pulling a certain amount then the solenoid is suspected or vacuum solenoid connected to control solenoid.
Click here how to test and diagrams.
Good luck. https://honda-tech.com/forums/honda-accord-1990-2002-2/need-help-egr-vacuum-control-solenoid-diagnosis-3045994/