Recently replaced all injector O-rings. Had lean codes on both banks. Couple of injectors sucking air. Detached fuel rail. Made sure injector holes in manifold (where the biggest O-rings go) were free of dirt. Lubed with some vaseline. Back in. Test drive and no codes. However, when I listen with my stethoscope can barely hear some sucking at three injectors. Nothing like volume before. Any ideas for better sealing? Is there something I could coat the big O-rings with that would survive the heat?

 

I know you used new o rings but, I suppose if push came to shove, Wipe off the Vaseline and apply RTV?? Let it dry overnight.

 

The oring is all that should be necessary.