I posted this pic a long time ago and got no response. I believe the problem I am having with my 4wd is a missing vacuum line or not routed correctly. Could someone look at this setup and let me know if this is correct?

Thanks

if you look closely there is a port against the fender with nothing attached to it. Also is there suppose to be a "t" connector there?

 

I can't veiw your photo. But I got a ? do you have Manual locking hubs.

 

I know it sucks when you can't get a reply. I just checked my 94 SR5 4x4 truck and it looks identical with the open port as well.

 

I ripped all that ADD vac stuff out of mine now or I'd look for you.

 

Its not maual hubs. So its normal to have that port open.

I looked at all my vacuum hoses this weekend they all look okay. I tried to test the switch in the 4 wd gear knob, but couldn't get to it.


It is so strange that if I go into 4L and then 4 H the 4wd light stays on and is in 4h. But if I am just driving and then shift to 4L- nothing. So i don't know if its in the gear knob switch or the vsv switch for 4H , I am assuming that they have a seperate switch for each.

Another thing I noticed this weekend when looking at the vacuum lines. I noticed some radiator fluid in th skid plate. I looked around and it looks like what I am guessing is the water pump, has some fresh rust on it. So not sure where it is coming from. If that is the water pump, looks like a pain to change. So i will keep an eye on the temp. for now. I did recently add radiator fluid, so I could have over filled it and maybe the jug overflowed and that is the cause.

 

Hey I was searching here to find out the same exact thing!
I was changing my antifreeze today and started looking around and noticed I had this hose nipple with no vacuum hose on it either. (see pics below)
Mine has auto hubs on it.
Still would be nice to have a link to a vacuum hose diagram for these 3vze models.
Anyone got one laying around they can scan up?
Thanks.

 

On my '90 truck, that open port in the fender is connected to a vacuum port on the plenum. I think that the connection provides vacuum to the resevior can under the passenger fender.


http://rides.webshots.com/photo/2409...98906002pamibe


In this picture, the hose that is connected to that port is the one that has the tee in it, next to the triple port on the plenum (behind the cold start injector), just above the hose with the check valve in it.