I was reading things to do to improve and maintain my 88 renix and kept coming across random "just eliminate it and plug the vacuum line" suggestions. So far I have heard cruiser say to eliminate the heater valve and permanently lock the two part front axle. I hate relying on little brittle vacuum lines to keep my engine running right.
So now my question: What vacuum mods or lines can I plug or remove without messing up mpgs or emissions(I live in CA)? And I never read if the three lines for the 4wd axle should stay plugged in like normal or plugged and eliminated? Thanks and as always pictures always help. -Luke

 

Leave that stuff alone.

Renix Vacuum Harnesses-Tip 22

The vacuum harness that attaches to the front of the valve cover and includes the grommet/fitting, and is called the front harness, is Napa part number BK 715-1367 or is a Dorman 46003.

The vacuum harness that is closest to the air cleaner, EGR etc, and is called the rear harness, is Napa part number BK 715-1366 or is a Dorman 46004.

The tube from the rear of the valve cover to the intake manifold is part number BK 715-1365 or Dorman 46005 and comes with the valve cover grommet.



Revised 12-28-2014

 

so does that mean to just leave the 3 lines for the 4wd on the axle alone after I lock it or plug them up? They do come off all the time when i'm go over bushes and stuff. thanks

 

Are we discussing CAD vacuum lines here or the vacuum lines under the hood for the engine?

 

CAD

 

Plug the source at the Y to the CAD system.

 

cool thanks

 

You can take off the egr valve lines.