Emissions

[Irish_Alley]

sometimes they are directly behind the carb so you cant see them

[zieg85]

One valve cover needs to have a breather filter or be piped back to main air filter housing

And the other needs to have a PCV valve and tube back to intake manifold or carb base

Look close.  Somewhere on the carb base or intake manifold will be a 5/16 or 3/8 nipple for a vacuum line

Or a plug or cap where someone capped it off

Mine runs much better wih it disconnected
I realize that means I have some problem
  But we can't figure out what it is


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Remember this is the 4.1L I-6

[roundhouse]

One valve cover needs to have a breather filter or be piped back to main air filter housing

And the other needs to have a PCV valve and tube back to intake manifold or carb base

Look close.  Somewhere on the carb base or intake manifold will be a 5/16 or 3/8 nipple for a vacuum line

Or a plug or cap where someone capped it off

Mine runs much better wih it disconnected
I realize that means I have some problem
  But we can't figure out what it is


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Remember this is the 4.1L I-6

still should have one breather into the crankcase somewhere  and a vacuum line


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[traumajunkie]

I have one valve cover, first hole goes to breather, second hole is oil fill and the third is the pvc valve.. I have taken the carb completely off and still no port on the carb,carb base or manifold

[roundhouse]

I have one valve cover, first hole goes to breather, second hole is oil fill and the third is the pvc valve.. I have taken the carb completely off and still no port on the carb,carb base or manifold

So where does your HVAC controls and other emission controls  like the thermactor draw vacuum from ?



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[traumajunkie]

Here is how I ended up doing the pcv, let me know what you guys think. It still seams to idle a little rough though...

[traumajunkie]

I have no idea what a hvac is, sorry this is my first build ever and still have a lot to learn

[LTZ C20]

HVAC: Heating, Ventilation & Air Conditioning

The HVAC term applies to vehicles, houses, building, new farm equipment(enclosed kind), warehouses, basically most anything that has heating AND cooling systems.

The HVAC in a car and often in other places can also be referred to as the Climate Controls.

It's very easy to mention anything with just a heater as the heater, something with heating and cooling the HVAC and anything with only cooling as the AC. If your talking about a heater only vehicle or just the heater system, then it would be the heater. If your talking about some kind of cooling system or just the air conditioning system it self then it would be the AC. If your taking about them together as 1 unit or system then it's HVAC.

Roundhouse asked where your vacuum supply comes from for the HVAC controls, this is because both the heater and air conditioning require a vacuum source to operate curtain parts of the system. They do not have seperate sources of power to make them work.

[LTZ C20]

Sorry, information overload there. Just want to make sure that you understand so we can help you better and you expand your knowledge of things mechanical.

[traumajunkie]

Haha ,Actually was not that bad and it makes since so thank you for explaining it... However I do not have ac, just two heater hoses coming from the firewall to the front of the motor.. So if there is a vacuum line Its in a different location...

[LTZ C20]

Ok good. The vacuum line should be going into the cab at a little rubber grommet type deal somewhere above the top of the heater box, I believe directly up above the heater hoses.

[traumajunkie]

Lol I dont have a box either.. I honestly feel like this poor truck has been through the ringer

[zieg85]

Went out in the pour down sleet and snapped this picture.  Without removing the air cleaned for exact port the PCV vacuum comes from it is besides the carb.  This is a 1984 C10 4.1L all factory emission stuff

[LTZ C20]

The vacuum line into the cab should be somewhere in the area of the red square. More off to the right where I can't see.

[zieg85]

The vacuum line into the cab should be somewhere in the area of the red square. More off to the right where I can't see.

Now I am confused.  I thought the original question was manifold to PCV?  He shouldn't have a vacuum line going into the cab since it is a non-AC situation???\

Am I missing something???