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-   -   Vacuum? (http://www.wranglerforum.com/f218/vacuum-79024.html)

Draco 02-06-2011 10:15 AM

Vacuum?
 
I just finished rebuilding my 90 4.2 and got it back in, now I'm left with the vacuum. Before I tore the engine out the vacuum was Lmost non existing so I'm just starting from scratch. My question is what is nessasary and what's not? vacuum advance is, I know but are there things not needed?

scott howard 02-06-2011 10:39 AM

depend on how tight your state is when getting it inspected.
but the only vacuum lines i have on mine is for the timing vacuum advance, pcv.
that is all that is needed to make the motor run.

Draco 02-06-2011 11:48 AM

In KY we don't do "VET" testing anymore......or any emissions testing for that matter

89JEEPYJ 02-06-2011 11:54 AM

the only neccasary vacuum i have on my truck is for the brake booster. The rest of it is just vent hoses for the motor and stuff like that. i dont have a vacuum advanced or anything like that

Draco 02-06-2011 11:57 AM

Mine has vacuum adv but no vacuum booster....you must have the spring weights for advance

89JEEPYJ 02-06-2011 12:01 PM

i have the HEI kit, i just have no computer or anything since i ripped it all out. it has a slot for a vacuum advanced but the truck wont run with it on

n2trucking 02-06-2011 06:41 PM

Yes my 1990 with MC2100, nutter bypass runs with only vacum booster and distributor and pcv. Runs really good. Better than with all that shit vacum stuff and carter carb.

mameyj 02-06-2011 09:07 PM

87 yj 4.2. Only distributor advance, brake booster and Pcv valve.

Fweaky 02-06-2011 10:27 PM

Its not necessary to run a vacuum advance on your distributor but it can improve engine efficiency, throttle response, gas mileage, and help it run cooler at idle.

n2trucking 02-07-2011 01:57 AM

Quote:

Originally Posted by Fweaky (Post 1038826)
Its not necessary to run a vacuum advance on your distributor but it can improve engine efficiency, throttle response, gas mileage, and help it run cooler at idle.

That's why i do. And lets not forget the most important vacum system.

4WD!!!!!!!!:thumb:

Draco 02-07-2011 01:31 PM

Does the 4wd vacuum run off the engine?

Matcheen 02-07-2011 04:42 PM

Quote:

Originally Posted by n2trucking (Post 1039288)
That's why i do. And lets not forget the most important vacum system.

4WD!!!!!!!!:thumb:

Posi or Permi - lock, no vac for 4wd either:thumb:

n2trucking 02-08-2011 11:00 AM

Quote:

Originally Posted by Matcheen (Post 1040319)
Posi or Permi - lock, no vac for 4wd either:thumb:

I haven't done that and not sure if i wanna mess with it. Is it a pain to install?

Undead-89 02-08-2011 02:12 PM

We stopped emissions testing years ago and now they are restarting again. Means i need to keep all 14 of those damn vacuum hoses intact.

Undead-89 02-08-2011 02:13 PM

The auto locking hubs use the Vacuum system to engage.

89JEEPYJ 02-08-2011 02:16 PM

ahhh screw emitions there is always someone that you can pay off. posi lock is a simple job, alen key set needle nose plyers, screw driver, and some diff fluid and your good to go.

n2trucking 02-09-2011 04:14 AM

Quote:

Originally Posted by 89JEEPYJ (Post 1042291)
ahhh screw emitions there is always someone that you can pay off. posi lock is a simple job, alen key set needle nose plyers, screw driver, and some diff fluid and your good to go.

Awsome!! Here in VA after 20 or 25 year old vehicle it doesn't have to get emissions test anymore. But where i live i still don't have to do it. :punk:


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