If you pull a vacuum on the valve with a hand vacuum pump and then release the vacuum does the egr valve stick open? No I did it 5 times(to 20 psi) and it snapped closed each time.
Also on the EGR Modulator, the filter on top was hard side down. I heard the hard/rough side goes up and the soft side down. There was a carbon deposit on the filter that may have plugged the vent hole under the filter. I will try driving for a while and see if the soft side down clears the high flow problem.
Also I tested the EGR temp sensor and got 150KOhms at 89.8 degF measured on the part. This seems ok as it's more than 2500 ohms. I also tested a spare sensor and got 273kOhms at 69.8degF. Which seemed ok.
Also I am confused as to how to carry out the following test procedure. How can I tell if theres restricted flow with the noise of the engine reving to 3500rpm? Is there a trick to it? Thanks
EGR VACUUM MODULATOR
1. Mark vacuum hose locations and disconnect vacuum hoses from EGR vacuum modulator.
See Fig. 26. Block ports "P" and "R" on EGR vacuum modulator. See Fig. 25.
2. Apply air pressure to port "Q". See Fig. 25. Air should flow freely through air filter side
of EGR vacuum modulator.
3. Start and operate engine at 3500 RPM. Repeat test procedures in steps 1) and 2). Strong
resistance of airflow should be felt. Replace EGR vacuum modulator if strong resistance is
not felt. Reconnect vacuum hoses to proper locations.
NOTE: When testing EGR vacuum modulator, it may be necessary to
monitor engine RPM by using scan tester. For scan tester
connections, see IDLE SPEED & MIXTURE in ADJUSTMENTS article.
NOTE: Ports "P" and "R" are the double ports on side of EGR vacuum
modulator. Port "Q" is single port on side of EGR vacuum
Wednesday, October 17th, 2012 AT 9:35 AM