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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: Spooky275 on March 21, 2018, 08:22:56 AM

Title: Mystery part
Post by: Spooky275 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.

(http://i44.photobucket.com/albums/f41/Spooky275/20180321_055133_zpsvtvzm2c5.jpg) (http://s44.photobucket.com/user/Spooky275/media/20180321_055133_zpsvtvzm2c5.jpg.html)

(http://i44.photobucket.com/albums/f41/Spooky275/20180321_055157_zpscqr1mq8m.jpg) (http://s44.photobucket.com/user/Spooky275/media/20180321_055157_zpscqr1mq8m.jpg.html)
(http://i44.photobucket.com/albums/f41/Spooky275/20180318_171649_zpswieqjrob.jpg) (http://s44.photobucket.com/user/Spooky275/media/20180318_171649_zpswieqjrob.jpg.html)

Title: Re: Mystery part
Post by: Rapid Roy on March 21, 2018, 09:14:13 AM

Welcome

Title: Re: Mystery part
Post by: Henry 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

Title: Re: Mystery part
Post by: Captain Swampy 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.

Title: Re: Mystery part
Post by: VileZambonie on March 21, 2018, 01:48:57 PM

Automatic or Manual, Federal or California Emissions, High Altitude or Normal? Look at the VECI label

Title: Re: Mystery part
Post by: VileZambonie on March 21, 2018, 01:51:57 PM

Federal w Automatic
California
High Altitude
Federal with Manual

Title: Re: Mystery part
Post by: Spooky275 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.