BOSSFC

iTrader: (2)

While having the UIM out of my 1990 n/a fc I was checking the VDI for any bind or stress so it would move freely.

I can have the VDI moving freely with wd40 and some back and forth motion but as soon as I tighten the VDI back into the UIM it is almost impossible to move and the actuator will not move it until well over 2.8 psi is applied then it will stick open.

Does anyone have any suggestions on lubrication or am I possibly missing a piece that makes it move more freely in the UIM once tightened in. I am adamant about having my six ports and VDI working correctly so I have no interest in just wiring it open, I want this fixed, any help is appreciated.

jjcobm

iTrader: (18)

Did you take apart the VDI mechanism or did you just spray at it? There is a bolt and nut that holds it toghether once you remove the actuator. Pull it out and clean the area INSIDE the intake manifold. It sounds like it's dirty.

By the way, there should be a VERY small C-Clip that holds the actuator to the rod mechanism/assembly. DO NO LOOSE it. It needs to come off in order to remove the actuator from the rod.

Also, once you put it back toghether, you will notice that it uses a gasket. Some high temp copper RTV will work as a gasket material. Apply some around the round area on the intake manifold, follow the instructions on the RTV label. The VDI mechanism only goes in one way.

BOSSFC

iTrader: (2)

I have taken it completely apart and out of the LIM and have cleaned the inside, I was able to take off the c clip and re install that as well.

jjcobm

iTrader: (18)

Hmmm... I can't recall exactly, but remove the VDI mechanism. Then you will need to grease the END of the rod and also the sides of the entire "cylinder" (for lack of better words). You may have installed it incorrectly back on the intake manifold. I suggest you take it apart, grease those points, and give it another shot at installing it. It should be butter smooth to rotate once in the intake manifold and I have a feeling it's binding on something.