Hey guys I just left my throttle body, upper and lower intake manifold soak overnight with simple green and then used heavy duty degreaser and let it soaked for a few hours... I noticed that some type of light grey oily residue got stuck around all the nuts/bolts/screws/ butterflies, etc. I then noticed that the plugs around the manifolds had something that looked like the residue as well as some kind of metal/plastic surround around the frezze plugs? What are these plugs for and can I put something like pvc cement around them to prevent them from leaking air?

Alex - thanx!

 

Anyone help?

 

Those plugs are just part of the casting process. I'm not sure if they go into the intake passages or not. Just get a little RTV and seal around that plug for peace of mind and you'll be OK.

Dale

 

+1