Intake Keeps Sucking In Oil After Plenum Fix
Record Breaker
Joined: Dec 2008
Posts: 1,200
Likes: 1
From: Claremont NC
Hambone, I also torqued the bolts a tad bit more. I had a wet #8 and #7 plug before I did the plenum and I just checked those plugs last week (almost a year after the fix) and they were dry. Matt, sounds like the first time you might have not cleaned the gasket surfaces of the intake and heads well enough. I had to work to clean those mating surfaces. Or maybe the gasket shifted on you when you installed. It's really hard to keep gasket in place when putting intake back on.
Do you have a baffle inside your passenger side vc? I've heard several stories of a vc without a baffle sucking a bunch of oil through your pcv. Look on the elbow of the pcv that your hose from intake connects to and see if you have oil a lot of oil in it and the tube going to intake. That might tell you something.
Do you have a baffle inside your passenger side vc? I've heard several stories of a vc without a baffle sucking a bunch of oil through your pcv. Look on the elbow of the pcv that your hose from intake connects to and see if you have oil a lot of oil in it and the tube going to intake. That might tell you something.
To keep the gaskets in place while installing the intake manifold cut the hex head off 4 of the old intake bolts and screw then back in the 4 corners a small amount. They will act as guide pins and keep the gaskets in place. After you have the intake installed and the other intake bolts snugged down remove the 4 corner cut bolts and screw in the new intake bolts and torque to 12 ft/lb in the required sequence. You can also use 1/4" wooden dowel rods for guide and simply pull them out after snugging the other bolts.
Grand Champion
Joined: Apr 2008
Posts: 7,055
Likes: 7
From: Lee County, North Carolina
I did the Hughes plenum plate a while back and it stopped the leak for the most part. I noticed a film of oil on the inside a while later and decided to do it again. I did the other Hughes plenum fix (if ya know what I mean) and now there is no way for oil to get in there aside from the PCV valve. When I took my intake manifold off the second time I noticed what looked like oil had been blown through the port for the PCV valve with compressed air.
Professional
Joined: Jan 2011
Posts: 124
Likes: 0
From: Christiansburg,va
wow! I guess that my solve my oil usage woes! I did the plenum and still lose oil though not nearly as bad! I had an aftermarket pcv since plenum fix last year and just swapped in a dealer pcv. I noticed a smaller hole in the bottom of the pcv on the dealer version compared to the aftermarket. I too a paper clip by hand and compressed the spring on both versions to see if the spring compression was different but it felt the same. I wonder if the smaller hole on aftermarket pcv helps prevent as much oil blowing into plenum? Did you use aftermarket or dealer pcv when installing the first time?
I highly recommend you not exceed the 12 ft/lb torque specs for the intake bolts. The intake manifold will act like a 'wedge' on the heads and over torquing them could cause some head gasket problems later on.
To keep the gaskets in place while installing the intake manifold cut the hex head off 4 of the old intake bolts and screw then back in the 4 corners a small amount. They will act as guide pins and keep the gaskets in place. After you have the intake installed and the other intake bolts snugged down remove the 4 corner cut bolts and screw in the new intake bolts and torque to 12 ft/lb in the required sequence. You can also use 1/4" wooden dowel rods for guide and simply pull them out after snugging the other bolts.
To keep the gaskets in place while installing the intake manifold cut the hex head off 4 of the old intake bolts and screw then back in the 4 corners a small amount. They will act as guide pins and keep the gaskets in place. After you have the intake installed and the other intake bolts snugged down remove the 4 corner cut bolts and screw in the new intake bolts and torque to 12 ft/lb in the required sequence. You can also use 1/4" wooden dowel rods for guide and simply pull them out after snugging the other bolts.
I just torqued them a little extra the second time. Nothing crazy.