oil,oil,everywhere in the airbox...

[osnixpero]

yes, i know this question has been asked a few times before. engine is a 4.0 i-6, i have replaced both hoses from the valve cover to 1) the airbox and 2)the intake port on the manifold. the only part i didn't replace was the grommet at the back end of the v.c. i'v read a dozen of the forum entries on this problem and believe i have cleared the blockages. is there any other thoughts on this. jeep is a 1991. i did replace the rear tube with a 1/4 inch tube and fitting from the v.c. to match the port on the intake.

 

[Bounty__Hunter]

The line from the valve cover to the airbox, have you pulled it at the airbox to make sure it has sufficient vacuum pulling into the valve cover?

 

[hogseye]

87 4.0 did the same thing. I bought the little vacuum/ vent line from v/c to air box and it came with the grommets to go in the v/c. from advance auto for about 7 bucks if I remember. According to what I read the grommet itself is often the problem as it is rubber and sometimes swells up to block the vacuum.

 

[hogseye]

sorry I meant the Vacuum line from the v/c to the intake manifold. Everything I read said to make sure and change the grommet itself as that can also be the culprit. But luckily they both came as a unit so there was no need to buy both separately.