1998 4wd Vacuum lines

[Vitamin_E]

I've been tryin to track down the source of my 4wd issues, and I'm wondering if anyone has some sort of diagram or experience with all of the vacuum hoses for the 4wd system.

For a little back story, about a year ago I had a front end collision in the 4runner, and ever since then I have had one issue or another with the 4wd. After getting everything fixed up, I noticed that I no longer heard the add disengage when taking off from a stop after being parked, and it felt as though the wheels were hopping even in 2wd. Despite this, 4wd still engaged and disengaged fine. Fast forward up to a few months ago, I swapped a low milage front diff in, but for some reason I still do not hear the add disengage from a stop. The 4wd also does not engage when shifted into 4wd. It does however engage after driving around for a few miles, will engage and disengage for a short time, but if left in 2wd the cycle will repeat.

From what I've check, I am getting vacuum at the vsv and the vsv is switching properly, transfer case engages properly. So I am left with the diff itself. A local mechanic recommended replacing all vacuum hoses, so that is why I am trying to find a good diagram of all hoses that play a role in the 4wd system.

Any help or other ideas would be great!! Thanks!

 

[Vitamin_E]

Nevermind I figured it out. The hard line that runs on top of the diff wasn't letting any air through. Bypassed it with a new hose and 4wd is working great.

 

[SIN-Japan]

Nevermind I figured it out. The hard line that runs on top of the diff wasn't letting any air through. Bypassed it with a new hose and 4wd is working great.

Is that one of the hard lines that has soft lines connected on either side?
Did the hard line get crushed or pinched?

 

[Vitamin_E]

Is that one of the hard lines that has soft lines connected on either side?
Did the hard line get crushed or pinched?

Yeah it connects to the lines coming off of the vsv and then connects via soft lines to the actuator. I'm not totally sure, I couldn't tell from the angle I was at, but there was quite a but if rust. I'm assuming that when I put in the diff, I probably but pressure on the line and split it or crushed it where it was already rusty.

 

[Mark_BC]

Can I use these vacuum lines to clean the carpet of my truck?

 

[Vitamin_E]

Yeah they're actually pretty strong. While I had it disconnected I used the lines to clean debris out of the frame rails. Makes for a fantastic and all natural Seafoam alternative.