This was bolted to the cylinder head completely disconnected. I don’t know what it is, the engine runs fine without it, but I would like to know what it is.

That is part of the emissions / Vacuum System from a ~1979 vehicle, and possibly other years. I am not sure if it is slant 6 specific or not. I just tossed one in the can from a 1979 Volare' Duster that I am parting out.

I can get a specific on the exact name of the part for you later, as I have 2 1979 F body cars stored here at the house this winter.

Greg

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Ah, ok. So it’s emissions. I wonder what its purpose was and what just disconnecting it does. Thanks for the help.

Garbage can filler

It is a vacuum Solenoid.
There is an electrical connection to it that turns on and off the vacuum signal from the carb to some of the other components it is interconnected to. I am not sure of the other specific responsibilities of the part.

It essentially is an electric valve between carb vacuum and the vacuum amplifier.

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I'm curious what year and model vehicle this part was taken off of.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

1975 d100

Hmm. I do not know if that would originally have been on a 1975 Truck engine, as most of the Trucks had zero emissions in 49 states until 1979, I believe. It is possible that your engine has been swapped at some time in the truck's life with a car engine.


Cheers!

Greg

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That is not the case. Light-duty truck emissions regs were less stringent than passenger car regs (and heavy-duty trucks were less stringent than light-duty trucks) but not nonexistent – and not just in California.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Yeah, it’s not true.

This is a family owned (since new) farm truck with 23,000 original miles. It’s total history is well known.

Vacuum cutoff solenoids like this were used (in various years and applications) to:

• enable/disable vacuum spark advance (first application was '71 California cars – coupled with a 3rd-gear switch on the shift linkage for manual transmissions or to an over-30 speed sensor for automatic transmissions)
• enable/disable EGR (coupled to coolant temperature sensors to preserve at least some pretense at driveability when the engine was cold)
• probably do other things, too

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Well I certainly do appreciate all the responses. It’s a shame this forum doesn’t get more activity. No doubt there are a lot of knowledgeable folks here.

Now that I know its function I did find it. Looks like Chevrolet used the same part.

Is there an electrical connection?
Could it be the vacuum reservoir?
Here is my 76 emission decal.

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Hyper_pak

It’s a TCS

Here’s the identical part
https://www.corvettecentral.com/70-spar ... 6cE80OU6W-

Thanks for the info Dan and others.

My truck /ramcharger /van is/ were v8 equipped and they have / had no emissions for '77 and '78, not even an egr or prehewas ted intake / warm air tubes.

Those 3 and some old memories from when I was a kid at dad's car lot was what I was thinking of.

Thanks for the confirmation of the family lineage of your truck. I bet it is a nice one.

Greg

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