Honda: 91 accord wont pass smog, Honda, Accord

Question
there are no check engine lights on. ive replaced the catylitic converter it runs real good the guy said maybe the egr valve might be messed up.so i took it of an it was that dirty now the hose that gos to it doesnt suck theres no air suction from it . so i replaced the whole vacumm box an theres still no suction.

Answer

Honda Accord EGR valve The EGR valve's vacuum control line should only get vacuum applied to it when the car is warmed up (closed loop)and the engine rpm is around 1500 to 2000. The EGR vale has a lift sensor attached to the top of it. This sensor has three wires. One wire is the 5 volt reference, another wire is the ground, the last wire is the signal wire. The 5 volt reference wire should have At least 4.96v. The ground wire should have proper ground of coarse. The signal wire should have about 1.2 volts at idle and should increase as vacuum is applied to it's vacuum port.