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Vacuum hose diagram?

Tiny
MINIVANMAMA2589
  • MEMBER
  • 2004 CHEVROLET VENTURE
  • 198,000 MILES
I have an 04 Chevy venture with the 3.4 L and on the passenger side of the manifold there is a nipple that looks as if some sort of line goes to it. Unsure what kind of line. There is one also on the driver side towards the front of the manifold that has a cap over it. Looked at Chilton's and Haynes and cant seem to find what goes to it. If you place your finger over the nipple it causes the motor to die down. (Not completely) At first though it ran to the tranny later realized it can the tranny is all electric. All of the diagrams I look at get me no where. At a lose and this mama needs her van ASAP please help
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Wednesday, November 6th, 2013 AT 9:59 AM

27 Replies

Tiny
DENNYP
  • MECHANIC
  • 1,823 POSTS
Do you see the vacuum port on either of the pictures I attached? If so, can you describe its location for me? Check out the images (Below). Please let us know what happens.
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Wednesday, November 6th, 2013 AT 4:06 PM
Tiny
MINIVANMAMA2589
  • MEMBER
  • 3 POSTS
Yes I do see it I circled it on the pic with paint. I also see that it has no hose or line attached to it. The thing is when you block off that nipple the motor dies down a lot and then eventually stalls out. I also know there is on near the front drivers side that looks like it has a OE Cap on it. Every picture that I have looked at it has shown one with a hose( the one that is capped off on my van) and the other one ( that is not capped off ) has a line going to it. Severely confused.
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Wednesday, November 6th, 2013 AT 4:17 PM
Tiny
DENNYP
  • MECHANIC
  • 1,823 POSTS
Ok, some of these engines did use a vacuum hose at that fitting. If there is one, it will be located on the back side of the engine near the 3 ignition coils. It will have a 90` rubber elbow on the end of it. It will be a small diameter hard plastic line.
If you don't see one of these lines, place a rubber cap over the port. Either way, it should not cause the vehicle to stall out. You may need to clean the inside of the throttle body to remove any carbon deposits to give the vehicle the proper airflow.
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Wednesday, November 6th, 2013 AT 4:41 PM
Tiny
MINIVANMAMA2589
  • MEMBER
  • 3 POSTS
The nipple to the front of the manifold is already capped. So I am to cap both of them? The motor stalls out when the on to the rear is blocked off with your finger. That is why I thought something went to it but it is a 04 and none of the manuals show what I need it to.
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Wednesday, November 6th, 2013 AT 4:47 PM
Tiny
DENNYP
  • MECHANIC
  • 1,823 POSTS
Yes, cap both vacuum ports.
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Monday, November 11th, 2013 AT 8:45 AM
Tiny
KERNEL_U
  • MEMBER
  • 10 POSTS
  • 2003 CHEVROLET VENTURE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 75,000 MILES
There is a black hose that plugs into the accordion air intake duct and routes to the rear of the engine. I cannot see where it plugs in (in fact, mine has unplugged and I cannot find where it goes :-( ). Any idea what this thing is?
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Tuesday, December 15th, 2020 AT 6:21 PM (Merged)
Tiny
JEDIKNIGHT2
  • MEMBER
  • 18 POSTS
It's called a PCV tube it is circled in red. Not sure why it's called that. Because the PCV is on a totally different line. Check out the diagrams (below). Please let us know what happens.
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Tuesday, December 15th, 2020 AT 6:21 PM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
This line connects to the rear valve cover and pulls vapor off the engine and routes it to the air inlet. It is called the breather tube and not the PCV tube. I attached the info for this tube. Let us know if you need more info and we can provide it.

Here is a guide that can help. It is not exactly matching your question but it shows this tube.

https://www.2carpros.com/articles/replace-an-air-intake-boot

Check out the images (Below). Please let us know what happens.
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Tuesday, December 15th, 2020 AT 6:21 PM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,542 POSTS
  • 2000 CHEVROLET VENTURE
  • 80,000 MILES
To what does the 1/8 plastic vacuum tube coming from the front left of the intake plenum attach to?
This tube broke on one end and I can't find traces of where it was connected. Thank you.
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Tuesday, December 15th, 2020 AT 6:21 PM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 33,726 POSTS
There's lots of plastic vacuum hoses. There's a diagram on the emissions sticker under the hood. You can splice the break with a piece of rubber vacuum hose or you can run a new rubber hose all the way to that component.
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Tuesday, December 15th, 2020 AT 6:21 PM (Merged)
Tiny
LUCKYLYNK
  • MEMBER
  • 8 POSTS
  • 2000 CHEVROLET VENTURE
  • 6 CYL
  • 113 MILES
Ok The hose on the red circled area is cut off on my van, I need to know where it goes so that I can hook it up. I tried to get my van to pass inspection but it threw a bunch of emissions codes and I suspect this to be a part of it.
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Tuesday, December 15th, 2020 AT 6:21 PM (Merged)
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
That hose circled in red is just a breather from the rear valve cover, that directs crankcase vapors back to the convoluted rubber air inlet tube. What are the emissions codes that it set?
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Tuesday, December 15th, 2020 AT 6:21 PM (Merged)
Tiny
LUCKYLYNK
  • MEMBER
  • 8 POSTS
Had it re- tested the only code up iss P0410 Secondary Air Injection System. Would that tube cause that? If not then what?
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Tuesday, December 15th, 2020 AT 6:21 PM (Merged)
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
No, that tube would not cause that. Possibilities for that code would include a faulty air pump or control circuit, perhaps a faulty vacuum control solenoid, or a leak in the system. Usually how that code is determined, is when the AIR pump is turned on, the system looks for changes in the oxygen sensor reading. If there are no significant changes observed, then the SAIR system is considered inoperative for some reason, and that code sets. That is kind of a nutshell description of the operation. I will attach the code chart for your reference, as well as the schematic. The chart references the use of a scan tool, which you may not have access to. If you know your way around a test light, some jumper wires, a schematic, and an electrical knowledge of a 12 volt DC system, You should be able to isolate a concern. I would start first with checking the fuses, and determining if the air pump can turn on.

Check out the diagrams (Below). Please let us know what happens.
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Tuesday, December 15th, 2020 AT 6:21 PM (Merged)
Tiny
LUCKYLYNK
  • MEMBER
  • 8 POSTS
Well if the air pump is on the driver side of van under fender its not even there, I see a rubber hose and a plug but no pump.
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Tuesday, December 15th, 2020 AT 6:21 PM (Merged)
Tiny
CRAIG.SAFAR
  • MEMBER
  • 1 POST
  • 1999 CHEVROLET VENTURE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 123,000 MILES
Where can I find a diagram for the vacuum lines?
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Tuesday, December 15th, 2020 AT 6:21 PM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.


https://www.2carpros.com/forum/automotive_pictures/261618_Graphic_263.jpg

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Tuesday, December 15th, 2020 AT 6:21 PM (Merged)
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
That would be a problem, That is the location I show for it.
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Tuesday, December 15th, 2020 AT 6:21 PM (Merged)
Tiny
LUCKYLYNK
  • MEMBER
  • 8 POSTS
Lmfao, runs great tho. But now to find a used one because there pricey
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Tuesday, December 15th, 2020 AT 6:21 PM (Merged)
Tiny
LUCKYLYNK
  • MEMBER
  • 8 POSTS
Ok, I went to junk yard and put in a air pump. Is it supposed to run all the time? Because it hasnt turned on yet, everytime I touch it while its running I dont feel it running. I checked the fuse and its fine.
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Tuesday, December 15th, 2020 AT 6:21 PM (Merged)

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