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Old 02-06-2011, 11:15 AM   #1
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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?

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Old 02-06-2011, 11:39 AM   #2
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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.

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Old 02-06-2011, 12:48 PM   #3
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In KY we don't do "VET" testing anymore......or any emissions testing for that matter
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Old 02-06-2011, 12:54 PM   #4
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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
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Old 02-06-2011, 12:57 PM   #5
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Mine has vacuum adv but no vacuum booster....you must have the spring weights for advance
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Old 02-06-2011, 01:01 PM   #6
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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
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Old 02-06-2011, 07:41 PM   #7
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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.
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Old 02-06-2011, 10:07 PM   #8
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87 yj 4.2. Only distributor advance, brake booster and Pcv valve.
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Old 02-06-2011, 11:27 PM   #9
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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.
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Old 02-07-2011, 02:57 AM   #10
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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!!!!!!!!
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Old 02-07-2011, 02:31 PM   #11
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Does the 4wd vacuum run off the engine?
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Old 02-07-2011, 05:42 PM   #12
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That's why i do. And lets not forget the most important vacum system.

4WD!!!!!!!!
Posi or Permi - lock, no vac for 4wd either
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Old 02-08-2011, 12:00 PM   #13
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Posi or Permi - lock, no vac for 4wd either
I haven't done that and not sure if i wanna mess with it. Is it a pain to install?
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Old 02-08-2011, 03:12 PM   #14
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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.
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Old 02-08-2011, 03:13 PM   #15
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The auto locking hubs use the Vacuum system to engage.
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Old 02-08-2011, 03:16 PM   #16
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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.
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Old 02-09-2011, 05:14 AM   #17
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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.

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2013 JK Wrangler Sport
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