4x4 doesn't engage
#1
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#5
crawl underneath your truck and at the front of the transmission (towards the front of your truck) right in front of a frame bar there is two metal lines bracketed to the brace. There should be teo lines connected to it one red and one black. Both of those should fit over the metal lines fastened to the brace. If both of them are unplugged the red line attaches to the shorter metal line and the black connects to the longer one.
If you have problems with those lines comming undone you can zip-tie them on
A leaky plenum should not loose that much vaccum to not allow your 4X4 to engage
Hope this helps
If you have problems with those lines comming undone you can zip-tie them on
A leaky plenum should not loose that much vaccum to not allow your 4X4 to engage
Hope this helps
#6
I found a chunk taken out of the bottom metal line in mine shortly after I bought it. In my case it didn't want to disengage the axle-- it would take miles before it did. I cut out that part with a dremel (about 1") and patched it with heavy vacuum tubing. Problem solved.
Another issue I had was the vacuum switch on the xfer case was stuck and the axle wouldn't disengage. This is the opposite of your issue though, and considering that it gets stuck in (don't think it could get stuck out) my opinion is that's not the problem. You could take it out and clean it anyway, it's free and easy. Just take it out with a 27mm deep socket or wrench, clean it with a mild solvent that's safe for plastic/rubber, and reinstall. It's on top of the xfer case, and has a plug with 4 vacuum lines coming out of it. Be careful not to break off any of the plastic nipples.
Another issue I had was the vacuum switch on the xfer case was stuck and the axle wouldn't disengage. This is the opposite of your issue though, and considering that it gets stuck in (don't think it could get stuck out) my opinion is that's not the problem. You could take it out and clean it anyway, it's free and easy. Just take it out with a 27mm deep socket or wrench, clean it with a mild solvent that's safe for plastic/rubber, and reinstall. It's on top of the xfer case, and has a plug with 4 vacuum lines coming out of it. Be careful not to break off any of the plastic nipples.