Hi everyone. I have a problem with my Ivac on my d16y7. On the code reader it says p1509. It also rumbles up and down. Like vrroom vrroom vrroom. I'm just new with this. I don't know if U need to change this. I also have a new an use. It's half and half. But it's still doing the same thing when I added it on. So don't really know. I've install a d16y8 manifold but I thought it never really give any effect with doing it on the d16y7. But please help me it's been awhile since I've got this car running.