How do you tell if EGR is bad? I fail smog guy said it ,might be EGR. When i pulled off vacuum line thats on the top of the 3way check valve it hissed air. Ive never heard that. Does that mean EGR is bad?
With the engine running push up on the egr diaphram and see if the engine stumbles a little, if it does the egr is good, Also what chip is in the car now, if it's a TT chip Eric turns off the egr function
If thats the case get yourself an emissions chip burned from Eric.
FWIW when you pulled the top hose off the three way check valve you were releasing the vacuum stored in the vacuum canister in front of the drivers front wheel. The air rushing out is a good thing as it indicates your check valve is more than likely functioning properly. Here is the factory chart for testing the EGR valve.