Thank YOU!!! Super helpful. Will pick up the hose this weekend. Hoping to get it in for registration tomorrow and then over to paint this weekend. Got delayed by a power steering leak (needed new o-rings), idle issues (kept cutting out, increased RPMs), and now it has a massive squeal at higher RPMs.acct21 wrote:That vacuum ball supplies the vacuum for 4WD -- at least it does on my '90. As you can see in the picture, there used to be a short section of red plastic line that attached to the vacuum ball. It provides vacuum to the selector switch below the dash. and then you will need to patch/repair/replace the yellow and green plastic lines that run from the firewall to the metal lines going to the transfer case. You will need to run vacuum from the manifold to the vacuum ball.
Here is the entire system removed from a vehicle. All that is missing is the attachment of the red line (vacuum supply to switch) to the vacuum ball. After the metal lines, the plastic line colors change, which is pretty confusing. Here is how they were attached from the factory:
2wd Side: Yellow plastic line to steel line, down to transmission area, to green plastic line, to rear side of transfer case vacuum motor.
4wd Side: Green plastic line to steel line, down to transmission area, to red plastic line, to front side of transfer case vacuum motor.
Oh wow, that is different. Thanks for sharing. Will test this weekend and get back. Thanks!
4wd may need to roll front wheels a little to engage, that doesn’t happen when you have it up in the air. Maybe try rotating front wheel by hand a little and see if it’ll engage?GrandW wrote: Jacked everything up, when I flip from 2 wheel drive (rear spinning), then switch to 4x4, the front doesn't spin. Any thoughts on where I'm going wrong?
It seems that you have too many hoses from the intake manifold feeding to various connections as far as I can see.
Good to read that the 4x4 is working
Letank - you're the best! Got this hooked up Thank you. Had to rerun most the lines, no idea who the POs mechanic was All the vacuum seems right now. THANK YOU!
Ah, thanks! I missed the dashed line circle previously. Can definitely get that squared away today.sirrus wrote:That thing is temperature controlled valve, referred to as TAC temperature sensor in the diagram above. It controls opening of the blend door, which mixes cold air with warm (from exhaust heat exchanger) for intake.
Will this be the same for an 84 grand wagoneer?GrandW wrote: ↑Thu Feb 07, 2019 8:44 pmThank YOU!!! Super helpful. Will pick up the hose this weekend. Hoping to get it in for registration tomorrow and then over to paint this weekend. Got delayed by a power steering leak (needed new o-rings), idle issues (kept cutting out, increased RPMs), and now it has a massive squeal at higher RPMs.acct21 wrote:That vacuum ball supplies the vacuum for 4WD -- at least it does on my '90. As you can see in the picture, there used to be a short section of red plastic line that attached to the vacuum ball. It provides vacuum to the selector switch below the dash. and then you will need to patch/repair/replace the yellow and green plastic lines that run from the firewall to the metal lines going to the transfer case. You will need to run vacuum from the manifold to the vacuum ball.
Here is the entire system removed from a vehicle. All that is missing is the attachment of the red line (vacuum supply to switch) to the vacuum ball. After the metal lines, the plastic line colors change, which is pretty confusing. Here is how they were attached from the factory:
2wd Side: Yellow plastic line to steel line, down to transmission area, to green plastic line, to rear side of transfer case vacuum motor.
4wd Side: Green plastic line to steel line, down to transmission area, to red plastic line, to front side of transfer case vacuum motor.
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the '84 is even more fun as it is the only year that also the front axle has a vacuum shift motor, so more lines..