Which way should vac line check valve be oriented?

bocephus · Post by **bocephus** » 27 Jun 2010, 13:29

Stupid question, I know, but I'm almost done with a huge amount of work in the engine bay of my '01 V70; I'm replacing the vacuum lines with new silicone lines, but the problem is, I didn't think to check the orientation of the check valves (the two white plastic pieces in the vac tree coming off the intake manifold), and now I'm not sure which way they're supposed to go. Should the arrows point TOWARDS the intake manifold, or away from it? TIA.

Post by **jblackburn** » 29 Jun 2010, 11:44

Towards the intake.

bocephus · Post by **bocephus** » 03 Jul 2010, 13:30

Thanks so much; that was how I'd oriented them, but I was still having a really rough idle, and thought that maybe I'd messed up the valves' orientation. Turned out to be a faulty MAP sensor; replaced it, and now the car's running great!