Vacuum Elimination?

**jasonh** · 07-11-2006, 05:23 PM

Can all these vacuum lines be eliminated? Not a very good picture, but its that vacuum setup on the passenger fender.

**gadget73** · 07-11-2006, 07:55 PM

Thats for the EGR and air bypass valves. The green line goes to the EGR, red is vacuum source. The other ones can be plugged if you'd like. If you want to get fancy, disconnect the plumbing totally to the lower two vacuum solenoids. The upper one that sits by itself is the one for the EGR system. The tees and crap can come out, just leave the little round can hooked into the system as a vacuum reservoir.

**jasonh** · 07-12-2006, 03:59 PM

What vacuum lines do I need on the car? I know I need the MAP and that reservoir can.

**gadget73** · 07-12-2006, 07:24 PM

Really all of them. There aren't all that many to be honest. One feed to the tree on the firewall, one to the MAP, one to the fuel pressure regulator, one to the control solenoids on the fender, and one to the evap purge solenoid on the fender near the battery.

**85crownHPP** · 07-12-2006, 08:58 PM

the car will run fine with out them (egr and smog velves), but at what efficiency is questionable.
gotta have the MAP

**gadget73** · 07-12-2006, 09:57 PM

On an EFI car, in theory it may run lean with the EGR disconnected, something about less oxygen being present so it delivers less fuel. It also reduces pinging at cruise if the EGR system works. The smog pump garbage is worthless tho.

**Paul_** · 07-12-2006, 10:29 PM

The cruise control on these cars is also controlled by a vacuum. There is a vac line coming off the tree on the firewall that goes to the cruise control servo.

**p71towny** · 07-12-2006, 10:49 PM

Im lucky, I only need a very few. I junked all that shit on my pass inner fender.

Archangel · 07-12-2006, 10:53 PM

Jason, click on the link in my sig, then look in the "vacuum lines" section - this is pretty much as clean as you can do it, and I still have the EGR and cruise fully operational.

Edit: or just click here.

**jasonh** · 07-13-2006, 04:06 PM

I just find it really messy under the hood. I can't just unplug em all and cap them off, eh? I don't have cruise and couldn't care less about the egr. I'm gonna see what I can do this weekend.

Archangel · 07-18-2006, 01:04 AM

Oh well, in that case just pull the red plastic line off the passanger side branch of the vacuum tree (the one on the left side is for the FPR, leave it plugged), cap off the tree's port, and rip off everything - smog pump, hoses, vacuum lines, solenoids, everything. It'll throw codes for the emissions BS, but you don't care about that anyways. For the cruise just plug the hose that goes from the T-ee check valve to the firewall, you can remove the cruise if you please after that.

**Mercmarquis** · 07-18-2006, 07:42 AM

Originally Posted by jasonh

I just find it really messy under the hood. I can't just unplug em all and cap them off, eh? I don't have cruise and couldn't care less about the egr. I'm gonna see what I can do this weekend.

Convert to a carb and you too, can also have a clean and simple motor! :heyhey:

**gadget73** · 07-18-2006, 09:10 PM

I'm the wierdo that wants to replace the disconnected smog pump solenoids just to get rid of the error codes. They won't have vacuum to them, but I want an 11. I do need to replace the lines running over there. Maybe I'll look around for red and green vacuum lines to keep it the correct coloring.

**PushnFords** · 03-09-2011, 08:23 PM

Yea I know...old thread...but if the smog pump solenoids are left hooked up electrically and just the vacuum lines removed...will it still set codes? I have a cobbled mess on my car...most of the plastic lines snapped with a light touch.

**GoodSamaritan** · 03-09-2011, 10:15 PM

Originally Posted by Mercmarquis

Convert to a carb and you too, can also have a clean and simple motor! :heyhey:

+1

On a side note. Instead of leaving the solenoids hooked up, could the harness be shortened, and a dummy load (resistor, contact closure, etc... whatever the computer is looking for.) be hooked up in their place, to remove the codes? If that harness is on a quick connect, it could be made up as a pigtail and even sold on ebay...

Wait, I forget sometimes that most box enthusiasts tend to be cheap like me. LOL.

**PushnFords** · 03-09-2011, 11:44 PM

Well I'll see how the changes I made tonight affect things. I now have the vacuum source going straight to the EGR solenoid and then straight to the EGR valve. The rest of the lines going to the smog pump stuff is unhooked. The small canister on the right fender is unhooked too. I was going to leave it but I didn't have a vacuum splitter...not sure which part (smog or EGR) it was meant to work with?

**1990LTD** · 03-09-2011, 11:58 PM

Originally Posted by PushnFords

Well I'll see how the changes I made tonight affect things. I now have the vacuum source going straight to the EGR solenoid and then straight to the EGR valve. The rest of the lines going to the smog pump stuff is unhooked. The small canister on the right fender is unhooked too. I was going to leave it but I didn't have a vacuum splitter...not sure which part (smog or EGR) it was meant to work with?

Down by the battery? If so, that's part of the EVAP system. It recycles the fumes from the gas tank into manifold vacuum so the motor can burn it. I believe the idea behind it is to keep the pressure down in the fuel tank. If you leave that unhooked it will vent those fumes to atmosphere wherever the canister itself is. Mileage might be worse since the computer is correcting for the (small) amount of fuel it's not seeing burned

If it's not the evap thingy then forget I said anything.

**PushnFords** · 03-10-2011, 07:09 AM

Originally Posted by 1990LTD

Down by the battery?

Well I unhooked that one too. I started tracing vacuum lines and the top one to the canister inside the fender was broken off. I unhooked a hose splice by the front of the intake (vacuum source to the cannister) and caped it off.

What I assume is a vacuum reservoir that I unhooked is on the rear of the RH inner fender and held down by two tabs with plastic clips.

**91waggin** · 03-10-2011, 01:21 PM

Leave the EVAP system hooked up. What happens if it doesn't work is that the pressure will build in the fuel tank until the gas cap reaches its preset limit and vents all of those fumes into the atmosphere. Which stinks, and may get fuel on the car's paint. Also, the computer is expecting the fuel vapors coming in through that system and it might run worse if it doesn't have them.

**gadget73** · 03-10-2011, 06:57 PM

you can actually just unplug the smog solenoids entirely. it sets codes, but so does having them there but not plumbed. Doesn't make any difference to how runs.

evap and egr systems are useful to have. They hurt nothing, and can buy a smidge of fuel economy. win-win IMO. the smog pump on the other hand is a useless waste of space.

Thread: Vacuum Elimination?

Thread Tools

Display

Vacuum Elimination?

Posting Permissions