Sounds good, making up a tester to go into the 02 sockets now, looking for about 9kpa at idle and 20kpa at 2500rpm?
she had right around 6-8 kpa at both B1, B2, S2 locations. No DTCs present active or in history before I removed the O2s for the back pressure test.
Checked and no vacuum leaks are present, it makes the noise the loudest under mild acel minimal to none under idle conditions, ac being on or off does not effect it,
It was an issue before, but became more pronounced after the cats where replaced.
Could be, i have yet been able to get it to make the noise when I could get the hood up and listen to it.
I was thinking along those lines, was trying eliminate any other options before I write up a $5-600 job then have it still make the noise after wards