1981 231 Vacuum lines + help please! - El Camino Central Forum : Chevrolet El Camino Forums
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Old 03-25-2012, 04:04 PM
FUNAGLE FUNAGLE is offline
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Default 1981 231 Vacuum lines + help please!

Had the head gaskets replaced in my 81 El Camino [FUNAGLE] and some of the vacuum lines [and a few other things!] were not put back together properly.

The motor is a 231 V6 with CA smog.



I could definitely use some help here. Please see attached photos:



Auto parts stores around here can not identify or find what these two round vacuum relays are.

They look identical. Each one has a vacuum line coming out of the bottom and each one has three wires coming out of the side that end in a wire connector.

They come up as 'MAP' Sensor in the auto parts stores computers but the MAP Sensor is just behind these two round 'things' ...



There are four vacuum lines coming out of the vacuum canister. The one in the above photo that is highlighted in red is a smaller diameter than the other three.

The vacuum diagram that I have shows this fourth vacuum line going into the carb but I can not find any open fitting for it to go into.

These 1981 231 V6 CA smog engines have vacuum lines all over the place.
The vacuum diagram shows eight vacuum lines going into the carburetor!



Any help very much appreciated!
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Old 03-25-2012, 06:11 PM
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Those "two round things" are first generation MAP and BARO sensors. This style was used almost exclusively in 1981 I believe if my memory serves me correctly. The later ones, 82-up, are the rectangular plastic ones more common today. I also think that if these fail, they can replaced with the "newer" style.
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Old 03-13-2016, 05:06 AM
andrewlgastelum andrewlgastelum is offline
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Where it says egr efe tvs what is the part that those vaccum lines meet at called? I know it's on the left valve cover but what's the name of it?
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Old 03-13-2016, 08:31 AM
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JJLT1 JJLT1 is offline
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I think that is the TVS, Thermal Vacuum Switch
it should screw into a coolant port,
the switch supplies the vacuum to the EFE before heatup,, and to the EGR after heatup..

heres some more vacuum diagrams
http://www.autozone.com/repairinfo/r...00c1528005163f

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