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98 4.0 Vacuum diagram?       #: 2103
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 Posted: Sat Apr 25th, 2020 07:59 pm
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aroundincircles
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Does anybody have a high quality vacuum diagram for a 98 (or what ever year is compatible) 4.0 auto? When I accelerate My A/C goes from blowing out the vents to blowing out the Defrost vents, and now we've hit summer in phx, that is a bit unacceptable.



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 Posted: Sat Apr 25th, 2020 08:10 pm
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It's the vacuum ball or orb or whatever you call it OR the little valve somewhere on the in side (since it is vacuum would it be the out side?).

Unfortunately you have vacuum hubs and that is not covered in my 2000 book I don't think.... let me run out to the garage.

The ball is on the passenger side low under the hood. You should be able to see it from the top. Hoses are easier to see with the tire off and removing the mud guard at least if not the entire fender well.

It is basically a reservoir and the hose going in to it has a little check valve, kinda like a "vacuum diode" that the minute the manifold vacuum is less than reservoir vacuum it will hold long enough for MOST situations.



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 Posted: Sat Apr 25th, 2020 08:11 pm
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By "in side" I meant the hose from the vacuum source to the ball. If you have removed your HVAC controls a bunch of times there might be a hose loose there also.



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 Posted: Sat Apr 25th, 2020 09:09 pm
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Thanks for the information. I will have to look monday morning when it is cooler outside. 

I do have vacuum hubs, but converted them to manual hubs since they were not locking. I did briefly lock into 4wd today, and that is when i noticed this happening. I wonder if I have a leak in that system. I am 99% sure I put myself back into 2wd, since I unlocked my hubs. I'll have to go check.



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 Posted: Sat Apr 25th, 2020 11:07 pm
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Yes that is the clue. You did not properly block the lines or disable the valve going to the lines. When you switched in to 4wd the valve opened and all the vacuum went to never never land under the wheel wells.

BAZINGA problem solved. Cut the wires to the valve and game over.



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 Posted: Mon Apr 27th, 2020 09:36 am
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I think I found it:



That line I circled in red was just bouncing around, so I hooked it up to the only nipple it could reach to, and seems to have fixed the issue. any idea what that is for?



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 Posted: Mon Apr 27th, 2020 10:16 am
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Just looked at mine, it comes toward where you are standing to a line that goes down and to your right from where you are standing.... to the vacuum ball. If you look down (again where you are standing) about straight down from where the mass air flow sensor is (the tube from the intake goes to it then continues to the air filter) you will see the almighty vacuum orb.



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 Posted: Wed Apr 29th, 2020 01:10 am
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Well, while that was loose it wasn't the source of my issues. More digging tomorrow to try to figure out exactly where the leak is at. Today's high was 104 degrees, and will be till the weekend.



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 Posted: Wed Apr 29th, 2020 10:22 am
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Dude, cut the wires to the valve that runs the hubs you deleted, plug the lines or loop them to each other! Nothing else is going to be traceable until you do that!



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 Posted: Wed Apr 29th, 2020 10:34 am
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that red vacuum line is the feed for your fuel pressure regulator......... it is rather important that it is hooked up and working correctly!
When you remove vacuum hubs you should have removed all the vacuum lines associated with them and the solenoid that controls the vacuum. Then you remove the vacuum feed line that used to feed the hubs and plug it up too, its pretty easy to do it used to be a "T" shape down by the vacuum solenoid, just eliminate the "T" so the lines go straight together......



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 Posted: Wed Apr 29th, 2020 11:09 am
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410customs wrote:
that red vacuum line is the feed for your fuel pressure regulator......... it is rather important that it is hooked up and working correctly!
When you remove vacuum hubs you should have removed all the vacuum lines associated with them and the solenoid that controls the vacuum. Then you remove the vacuum feed line that used to feed the hubs and plug it up too, its pretty easy to do it used to be a "T" shape down by the vacuum solenoid, just eliminate the "T" so the lines go straight together......

? Then mine is hooked up wrong and it wasn't by me. 2000 4.0 pushrod



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I'm not following??? 
Cut the wires, loop the vacuum lines together = should be fine! 
As long as you remove the vacuum feed from the engine to the vacuum hubs when you remove the hubs, that is all that is required. Cutting wires or removing the whole system like I try to do is just bonus.
I remove all lines from under the truck, the ones that go from the solenoid to each knuckle
Then I remove the solenoid
Then I loop the trucks vacuum lines back to itself by removing the tee



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 Posted: Wed Apr 29th, 2020 06:39 pm
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The red vacuum line. Mine comes out toward the fender and continues (after connecting to a straight) to the vacuum accumulator. Mine never had the vacuum hubs.



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 Posted: Thu Apr 30th, 2020 12:09 am
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410customs wrote:
that red vacuum line is the feed for your fuel pressure regulator......... it is rather important that it is hooked up and working correctly!
When you remove vacuum hubs you should have removed all the vacuum lines associated with them and the solenoid that controls the vacuum. Then you remove the vacuum feed line that used to feed the hubs and plug it up too, its pretty easy to do it used to be a "T" shape down by the vacuum solenoid, just eliminate the "T" so the lines go straight together......

Yes I will be doing that this weekend. unfortunately this decided to be a PITA now that it has hit 104 degrees this week (it was low 80's last week). so will have to wait to saturday morning to do the work. didn't even think about it when I did the hubs.



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 Posted: Thu Apr 30th, 2020 08:25 am
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I'll trade you. I've been home for 12 days now and I have been able to get outside and do anything 3 of them without a rain coat and a winter jacket.



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 Posted: Thu Apr 30th, 2020 09:07 am
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JAMMAN wrote:
I'll trade you. I've been home for 12 days now and I have been able to get outside and do anything 3 of them without a rain coat and a winter jacket.
nah, I'm here for the winters. Winters in AZ are amazing. It's just the summers that suck. and my garage is too short to pull the truck in.



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 Posted: Thu Apr 30th, 2020 10:12 am
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Off topic but I used to live in Northern Michigan, the 3 months we actually got of summer was incredible. I think I only saw 90 like a half dozen times in the 5 years I was up there.

The 2 feet of snow per hour during the winter was a nightmare though.

I really wish I could fly south for the winter and spend the summer up north.



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 Posted: Thu Apr 30th, 2020 10:26 am
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JAMMAN wrote:
Off topic but I used to live in Northern Michigan, the 3 months we actually got of summer was incredible. I think I only saw 90 like a half dozen times in the 5 years I was up there.

The 2 feet of snow per hour during the winter was a nightmare though.

I really wish I could fly south for the winter and spend the summer up north.

We call those snow birds, and We have enough of them thank you. Nearly 1/3rd of my neighbors are snow birds. It will be interesting when we hit the silver tsunami.



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 Posted: Thu Apr 30th, 2020 11:03 am
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all the snow birds from CA, TX, FL, AZ, UT, all seem to come to Idaho in Summer..
10 out of 12 of our "neighbors" back here are snow birds...... We do this full time!! I love SNOW the more the better....I cant take too much HEAT though, 85 degrees is TOO HOT to me :) when its 104 I could just die unless I am in a boat on a lake then its ok



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 Posted: Thu Apr 30th, 2020 01:41 pm
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410customs wrote:
all the snow birds from CA, TX, FL, AZ, UT, all seem to come to Idaho in Summer..
10 out of 12 of our "neighbors" back here are snow birds...... We do this full time!! I love SNOW the more the better....I cant take too much HEAT though, 85 degrees is TOO HOT to me :) when its 104 I could just die unless I am in a boat on a lake then its ok

I'll be honest. I hate the heat, I just hate snow more. I work a job that doesn't require me to be in office full time. I'm thinking, that if the housing market crashes this summer, I will pick up a house in north eastern AZ, somewhere up in the pine trees, where highs MIGHT hit 90 degrees, but hover in the mid-low 80's in the summer. I'll become what I hate, but only for a couple of months out of the year, got kids in school, so would only be in the summer when they are out of school.



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 Posted: Thu Apr 30th, 2020 08:02 pm
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I could do in 90's all year no problem. Never gets old.



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 Posted: Thu Apr 30th, 2020 08:12 pm
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Back on topic, I bypassed the 4x4 lines:



and no luck. 

Did you get that diagram? all the vacuum lines I found were in great shape, and the ball had no visible cracks in it. I would hate to replace it just to find an issue somewhere else.



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I'm leaving this on the screen to remember, because I'm old.

I went to the garage this morning and got my book. What I have is a electrical wiring diagram book not a EVTM so I guess it is a ETM lol.

Anyhow when I get the wife to work I'll pull the 4.0 out of the garage and get under the hood. I'll take a few pics and we will see if it is similar. It's a 00 with a 4.0 push rod and never had vacuum hubs but I'm sure they were similar if not exact.
Do you happen to gave a vacuum gauge?



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 Posted: Sat May 2nd, 2020 11:47 am
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TMI thread on vacuum LOL:
Vacuum Related



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 Posted: Sat May 2nd, 2020 01:31 pm
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You sir, are a gentleman and a scholar. 

Thank you so much!



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