Plain Jane OEM nothing to see here rebuild

[Pete_89T2]

Originally Posted by JustJeff

Rear 3 nipples on the UIM

1. Middle = IIRC is the larger and goes to the OMP injectors via the splitter. One of my nipples on that splitter broke. I have it plugged and get vacuum/pressure (not sure which) from a different source on either the UIM or LIM. But only for that one OMP injector.

On that larger middle nipple, you're correct that it is supposed to go to the 1-4 splitter, and from there to each OMP injector. If memory serves, that nipple is not vacuum, it's just an air bleed (pre-throttle plates). If the splitter is broke, just get yourself 3 "Y" or "T" style vacuum line fittings and use them to make a functional 1-4 splitter, and connect to each OMP injector. If that one OMP injector you have plumbed solo is getting vacuum instead of pre-throttle air, it may not work properly.

[JustJeff]

Originally Posted by Pete_89T2

On that larger middle nipple, you're correct that it is supposed to go to the 1-4 splitter, and from there to each OMP injector. If memory serves, that nipple is not vacuum, it's just an air bleed (pre-throttle plates). If the splitter is broke, just get yourself 3 "Y" or "T" style vacuum line fittings and use them to make a functional 1-4 splitter, and connect to each OMP injector. If that one OMP injector you have plumbed solo is getting vacuum instead of pre-throttle air, it may not work properly.

Good to know. I wondered about that and I've kept an eye on the OMP hoses. I rebuilt them with clear teflon hoses and they all have oil traveling through them. When assembling the engine I thought about getting a splitter like you suggested, but I assumed all the nipples on the intakes saw the same pressure and/or vacuum. Apparently I assumed incorrectly and need to do some more reading about emmissions removal and such.

What the OCD person in me wanted to do was to remove the spiders nest entirely and get some metal hoses to connect what I was keeping. I really didn't like the idea of having to track each hose from it's source and risk mistakes on routing them. I may go back to that idea. Get some metal hoses and bend them to route underneath the UIM and TB.

The top rear nipple on the UIM is what I used to route to my boost gauge. The mechanical sees no vacuum. As a side note this might be related. My brakes have been "mushy" since the rebuild. Before it they were good. I've assumed this whole time that either I didn't get all the air out of the lines or that my master cylinder coincedentally went out. Is it possible that I've got a vacuum/pressure issue that is also causing problems with my brake booster? I have the brake booster routed as it normally is. The metal fitting on the LIM to the metal hose on the firewall.