My runner is not passing smog because of High Nox. After troubleshooting it and wanting to shoot it. I traced the problem down to the EGR and basically it is not opening because of the vacuum modulator which supplies vacuum to the EGR. After running my runner for about an hour you can put your hand on the EGR line which goes between the EGR and Intake manifold and it is barely warm. I checked the EGR with vacuum and it stalls the engine, the BVSV changes with the temp of the engine, and I am getting vacuum back to the modulator. After checking the modulator and cleaning it I am still not getting vacuum through it. Does anyone have info on what modulators a 86 4runner should have? I need a part number and can anyone explain how the modulator should work? I am about to modify the vacuum lines to eliminate the modulator and run straight vacuum off of the manifold to the EGR and see how this would affect the NOX. Anyone have a similar problem to mine with a way to fix it?