Author Topic: Emissions  (Read 11277 times)

Offline timthescarrd

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Re: Emissions
« Reply #30 on: March 03, 2015, 01:53:16 PM »
Older heater only truck didn't use vacuum, it was all cable driven.  PCV should be getting steady vacuum, so if your tying into the breather, it's probably only getting vacuum when the throttle is open (thus rough idle).  Anywhere on the intake manifold or carb that you can find full vacuum (i.e. not ported) should work fine

Offline LTZ C20

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Re: Emissions
« Reply #31 on: March 03, 2015, 02:28:01 PM »
He should still need vacuum to operate the floor or defrost vent positions right? Unless in a heater only truck these are cable operated, if that's the case then ignore everything I said about there being a line into the cab and I'll pull my foot out of my mouth.

Now I think I'm missing something, I have an ac truck so I have no idea lol.
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Offline LTZ C20

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Re: Emissions
« Reply #32 on: March 03, 2015, 02:29:11 PM »
And timthescarrd comment was on page 4, which I just now saw. Cable driven system, I'm done here haha.
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Offline zieg85

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Re: Emissions
« Reply #33 on: March 03, 2015, 02:35:29 PM »
He should still need vacuum to operate the floor or defrost vent positions right? Unless in a heater only truck these are cable operated, if that's the case then ignore everything I said about there being a line into the cab and I'll pull my foot out of my mouth.

Now I think I'm missing something, I have an ac truck so I have no idea lol.

Everything is cable operated on a non-AC truck...
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
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Offline traumajunkie

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Re: Emissions
« Reply #34 on: March 03, 2015, 08:36:45 PM »
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
I appreciate that, are you referring to the brass hose going into the black rubber hose in the bottom left ? I will get a better picture tomorrow when i get home of the carb and between it and the manifold. I have looked and looked and cannot find anything. After reading tese post I am starting to think I am crazy. a comment was made from the rough idle being due to me connecting it to the breather..will this position work minus the rough idle or is it pointless?
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Offline zieg85

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Re: Emissions
« Reply #35 on: March 03, 2015, 09:35:42 PM »
this one.  Next available time weather permitting I will take off the air cleaner.
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
https://www.facebook.com/groups/248658382003506/

Offline traumajunkie

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Re: Emissions
« Reply #36 on: March 03, 2015, 09:40:26 PM »
Yea thats the one i was talking about, so the black hose goes into the carb
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Offline zieg85

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Re: Emissions
« Reply #37 on: March 03, 2015, 09:48:48 PM »
Yea thats the one i was talking about, so the black hose goes into the carb

I will check on mine but if yours does at the base of the carb that should be manifold vacuum.  If you have a rough idle you may have a vacuum leak or carb is shot or out of adjustment.  Mine runs perfect, I just have a knock, really uses oil and antifreeze in the oil.
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
https://www.facebook.com/groups/248658382003506/

Offline LTZ C20

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Re: Emissions
« Reply #38 on: March 03, 2015, 11:25:38 PM »
I'm an idiot today.
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Offline traumajunkie

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Re: Emissions
« Reply #39 on: March 04, 2015, 05:50:34 PM »
here is some pics, idle is about 700-800 and when i gas it it sputters so may just need a carb clean ( have not done it yet) tell me hwat you guys think
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Offline traumajunkie

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Re: Emissions
« Reply #40 on: March 04, 2015, 05:53:05 PM »
pic 1
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Offline traumajunkie

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Re: Emissions
« Reply #41 on: March 04, 2015, 05:54:43 PM »
2
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Offline zieg85

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Re: Emissions
« Reply #42 on: March 04, 2015, 06:06:52 PM »
What is this?
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
https://www.facebook.com/groups/248658382003506/

Offline traumajunkie

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Re: Emissions
« Reply #43 on: March 04, 2015, 06:29:19 PM »
something broken, I initially thought that was the port but it has no suction nor does it blow
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Offline zieg85

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Re: Emissions
« Reply #44 on: March 04, 2015, 06:39:38 PM »
something broken, I initially thought that was the port but it has no suction nor does it blow

Spray some brake clean down there and see if it effects the idle.  That may be where the PCV line went, got broken and plugged...  That may be the source of a vacuum leak if the RPM's increase.

I will take my air cleaner off next good day and take a look at mine for you.
Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
https://www.facebook.com/groups/248658382003506/