1981 231 Vacuum lines + help please! - El Camino Central Forum : Chevrolet El Camino Forums
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Old 03-25-2012, 05:04 PM
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Twisted Wrench
Join Date: Feb 2010
Year: 1981
Model: El Camino Classic
Region: 18(CA)
NECOA #: 15939
Posts: 18
FUNAGLE will become famous soon enough
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, 07:11 PM
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rnhart3 rnhart3 is offline
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Master Wrench
Join Date: Nov 2010
Name: Jim
Location: Milford
Year: 1979
Model: El Camino
Region: 2 (CT,MA,ME,NH,RI,VT)
NECOA #: 17856
Posts: 802
rnhart3 will become famous soon enough

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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1979 El Camino, retired daily-driver,
current frame-off resto project
1986 Monte SS, mild 350, headers, elec cooling
fan,"A" Pillar gauges, subtle
modifications to transmission, #3 son is a trans tech...
1986 Monte SS T-Tops, for parts...
1985 El Camino
1986 El Camino
1991 S10 pick-up
1997 Chevrolet Tahoe 2 dr.
1981 Malibu wagon with 9C1 drivetrain...parts?...or drive?
"Too many parts cars to mention....."
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