What is this? And should I get a new one? + General noob questions...

[81GMCSierra]

Here is a pic... http://imgur.com/t8czsqf

It was attached to the bolt that held the thermostat housing down. I am so new that I really don't know what anything is called. Is there a manual that will tell me the names for all the parts in the engine compartment. I know I have a bunch of work but it takes me a while to figure out the name of what I am looking at.

Also is there standard tubing for all the little tubes that run around the engine that are attached to the thinga-ma-jig in the picture? Can I just get a bunch and cut them to length? Also how should I keep track of what tubes go to what?

Sorry for such a noob post. I don't really know where to start. I just figure I have to replace just about everything. Here are some pictures of the engine... http://imgur.com/a/2vIGK

 

[Skweegle89]

Most of those "tubes" are vacuum lines. There will be 2 or 3 different diameters. You can buy vacuum hose at about any parts store. Just get about 5 feet of each size and cut it to length. That will leave you with some extra in case you need it down the road. Just replace 1 at a time so everything goes back where it's supposed to.


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[GTME94]

There should be a decal on the air cleaner showing all the vacuum line routing. If yours is missing there is a thread on here with images of lots of them. Find your year and engine to help figure it all out.

http://www.gmsquarebody.com/forum/showthread.php?t=3520

 

[81GMCSierra]

any ideas on the part i posted?

 

[chengny]

any ideas on the part i posted?

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Looks like it might be a decel valve - they always seem to be mounted on the t-stat housing for some reason. Here is what it looks like on later models:

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But, there are usually two bigger hoses attached to it as well the small actuating line - so who knows? Is the EPA sticker still on the radiator support frame?

 

[81GMCSierra]

Yeah is was attached to the thermostat housing. So I guess that is what it is.

What does it do? Should i replace it?

 

[Rusty Nail]

I'm no help having seen you installed a 4.8.
I used to have a good answer.