Hi Roy or any other pros,
Please excuse me for bringing this topic back. With manuals etc, I did thorough tests on my EGR modulator both on-vehicle and off (with vacuum gauge). All indicate this part is still good.
And per some readings, the EGR modulator (at least for Toyota) is designed to be open to air at engine off. So I am very confused, as leaking smoke appears to be normal during a smoke test for vacuum leak. Any advice appreciated.
Monday, October 1st, 2018 AT 2:19 PM