Author Topic: Mystery part  (Read 2642 times)

Offline Spooky275

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Mystery part
« on: March 21, 2018, 08:22:56 AM »
Sorry if it's something painfully obvious but me and my buddy can't figure out what this part circled in blue is exactly. It's in my 84 c10 with a completely stock 305. It has line to the evap canister and a small hole in the back with a broke off hose fitting inside it which I think was line to the carb. Can anybody ID this? Thanks in advance.






Offline Rapid Roy

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Re: Mystery part
« Reply #1 on: March 21, 2018, 09:14:13 AM »
Welcome
1974 Cheyenne 10 LWB STOCK 350 W HEI /TH350/AC/4 BBL Quadrajet
Mopar by Birth
Chevy by Choice

Offline Henry

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Re: Mystery part
« Reply #2 on: March 21, 2018, 12:31:24 PM »
Hi Spooky:
If the little device you have circled has at least one hose back to the ECS vapor canister, then it probably is a thermal delay valve for the ECS. The thermal delay valve prevented ECS vapor canister purging until the engine was warm. There was quite a few changes in the design of the GM ECS system for your vintage truck, but I am sure that little device is a ECS control valve. If the connection to the carb is gone, you would want to re-connect it or at least make sure the carb end of the connection is plugged so the carb doesnt have a vacuum leak.
Regards,
Henry

Offline Captain Swampy

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Re: Mystery part
« Reply #3 on: March 21, 2018, 12:43:15 PM »
It might tell you what it's called on your vacuum house diagram on the radiator support. Looks like part of the air injection system. Might be a dealer only item. I couldn't find anything that looked like it on rock auto in the emissions section.
1987  350TBI 700R4  4X4  4.56 gears  33" BFG All Terrain


http://forum.73-87chevytrucks.com/smforum/index.php?topic=32209.0

Offline VileZambonie

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Re: Mystery part
« Reply #4 on: March 21, 2018, 01:48:57 PM »
Automatic or Manual, Federal or California Emissions, High Altitude or Normal? Look at the VECI label
,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline VileZambonie

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Re: Mystery part
« Reply #5 on: March 21, 2018, 01:51:57 PM »
Federal w Automatic
California
High Altitude
Federal with Manual
,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Spooky275

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Re: Mystery part
« Reply #6 on: March 21, 2018, 06:47:41 PM »
Thanks everybody.



Edit: found out it's a deceleration valve, if anybody ever runs into the same thing.
« Last Edit: March 23, 2018, 01:01:54 AM by Spooky275 »