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| Please help me identify this part https://slantsix.org/forum/viewtopic.php?t=68520 |
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| Author: | spartygw [ Tue Jan 27, 2026 1:19 pm ] | ||||
| Post subject: | Please help me identify this part | ||||
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.
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| Author: | Greg Ondayko [ Tue Jan 27, 2026 2:19 pm ] |
| Post subject: | Re: Please help me identify this part |
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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| Author: | spartygw [ Tue Jan 27, 2026 3:41 pm ] |
| Post subject: | Re: Please help me identify this part |
Ah, ok. So it’s emissions. I wonder what its purpose was and what just disconnecting it does. Thanks for the help. |
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| Author: | volaredon [ Tue Jan 27, 2026 6:44 pm ] |
| Post subject: | Re: Please help me identify this part |
Garbage can filler |
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| Author: | Greg Ondayko [ Wed Jan 28, 2026 1:59 am ] |
| Post subject: | Re: Please help me identify this part |
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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| Author: | SlantSixDan [ Wed Jan 28, 2026 4:08 pm ] |
| Post subject: | Re: Please help me identify this part |
I'm curious what year and model vehicle this part was taken off of. |
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| Author: | spartygw [ Wed Jan 28, 2026 4:15 pm ] |
| Post subject: | Re: Please help me identify this part |
1975 d100 |
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| Author: | Greg Ondayko [ Thu Jan 29, 2026 4:33 am ] |
| Post subject: | Re: Please help me identify this part |
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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| Author: | SlantSixDan [ Thu Jan 29, 2026 12:11 pm ] |
| Post subject: | Re: Please help me identify this part |
Quote:
most of the Trucks had zero emissions in 49 states until 1979 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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| Author: | spartygw [ Thu Jan 29, 2026 12:17 pm ] |
| Post subject: | Re: Please help me identify this part |
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. |
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| Author: | SlantSixDan [ Thu Jan 29, 2026 12:35 pm ] |
| Post subject: | Re: Please help me identify this part |
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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| Author: | spartygw [ Thu Jan 29, 2026 12:48 pm ] |
| Post subject: | Re: Please help me identify this part |
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. |
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| Author: | hyper_pak [ Thu Jan 29, 2026 1:12 pm ] | ||
| Post subject: | Re: Please help me identify this part | ||
Is there an electrical connection? Could it be the vacuum reservoir? Here is my 76 emission decal.
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| Author: | spartygw [ Thu Jan 29, 2026 1:30 pm ] |
| Post subject: | Re: Please help me identify this part |
It’s a TCS Here’s the identical part https://www.corvettecentral.com/70-spar ... 6cE80OU6W- |
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| Author: | Greg Ondayko [ Thu Jan 29, 2026 3:46 pm ] |
| Post subject: | Re: Please help me identify this part |
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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