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05-31-2023, 03:31 PM
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#1 |
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Junior Member
 Join Date: Jul 2010
Location: Goodyear, AZ
Posts: 65
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What is this Vavle for
Hello,
What does this valve do, and where should the vacuum line be routed? It's capped off as you can see. It's on bolted toward the back of the intake Manifold. This is a 250 Inline 6. [IMG]  [/IMG]
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05-31-2023, 03:49 PM
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#2 |
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Registered User
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,625
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Re: What is this Vavle for
Egr valve, allows exhaust into the intake to reduce emissions.
__________________
1969  307, t3501950 Chevy Wagon 1978 Big 10 1967 C10, 250,3-OTT |
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05-31-2023, 03:51 PM
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#3 |
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Junior Member
Join Date: Jul 2010
Location: Goodyear, AZ
Posts: 65
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Re: What is this Vavle for
So I would loop a vacuum like back to the Carb somewhere? It's not a big line, maybe 1/4".
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05-31-2023, 04:05 PM
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#4 |
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Registered User
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,625
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Re: What is this Vavle for
You would want to run a line to a ported vacuum source.
__________________
1969 307, t3501950 Chevy Wagon 1978 Big 10 1967 C10, 250,3-OTT |
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05-31-2023, 04:28 PM
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#5 |
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Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,611
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Re: What is this Vavle for
If the emission sticker is still on the radiator support, it will tell you where the vacuum line goes. Sometimes they route thru a temp sensor on the t-stat housing.
Otherwise post up the year and maybe someone will post a pic of a sticker. |
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05-31-2023, 06:14 PM
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#6 |
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Junior Member
Join Date: Jul 2010
Location: Goodyear, AZ
Posts: 65
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Re: What is this Vavle for
Oh yeah, its a 1978 GMC C15. I don't have the sticker. There isn't a temp sensor on the housing. There are two blocked off plugs. They're painted blue to match the Thermostat Housing. It's possible it was removed.
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06-03-2023, 12:29 AM
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#7 |
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Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,634
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Re: What is this Vavle for
Do they have emission testing in your part of the state for this year of truck?
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06-03-2023, 07:35 AM
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#8 |
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Registered User
Join Date: Oct 2013
Location: Maine
Posts: 2,376
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Re: What is this Vavle for
A lot of people just bypass it
__________________
76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10 |
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06-03-2023, 10:14 PM
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#9 |
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Junior Member
Join Date: Jul 2010
Location: Goodyear, AZ
Posts: 65
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Re: What is this Vavle for
Maricopa county (Greater Phoenix Area) actually does emissions testing. Looks like the P.O. bypassed it by plugging it off. I'd like to attempt an emissions test soon. I'll probably need to connect it for testing purposes.
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