The PCV elbow connector that turns into the intake manifold on my truck was hissing unless I wiggled it around a bit. When I pulled it out, there was no oring on it. Watching install vids and even looking at the intake manifold online it comes with an oring, but I can’t figure out what size. I couldn’t get one that fits right from an assortment package. Any help? I’ve been chasing some intermittent lean codes and I think this is a big contributor.

5.4L by the way

 

 

A trip to a hardware could secure new O-rings. This is on my 2.7. I have taken many parts into the hardware to size an O-ring, KM

 

So... what YEAR is your truck? You posted in a Gen 10 section... I'm not aware of any Gen 10 V8 that had an O-ring for PCV.

 

Yeah this is planet Gen 10. We don't use no piddly o-ring...just a big **** grommet.

 

It's a 2000, I pulled out the PCV connector that connects the PCV valve and hose into the intake manifold. The elbow has a slot for an Oring, and that's the area that's hissing. Maybe I'm overthinking it?