620Vq35

Hey Guy, i may be asking a dumb question here but im sure someone will be kind enough to help out. I took off my upper plenum today to replace a faulty gasket, after removing i notice apot of build up in the plenum and was wondering if it was normal, and what can i use to clean.

DavesZ#3

iTrader: (26)

It is normal. I've cleaned mine with mineral spirits. It's just oil that is picked up from the PCV recirculation line to goes back to the intake tube.

herrschaft

I used engine degreaser

taywan

iTrader: (53)

nothing to worry about and I just used parts/brake cleaner when I had mine apart-super easy+fast.

620Vq35

Thanks!

RENFRO

iTrader: (1)

Throw on a catch can if you don't want so much buildup. After swapping out my plenum for a ported & polished one and noticing the buildup, I installed one on my passenger pcv valve.