Chasing down vacuum problems and both of these (see pics) valves are called out for on the parts drawings for my 94 4.3W 4WD. Which one is right and what's the difference?

As always, thanks!

 

you forgot to upload the other. only see 1.

 

Second one...

 

ok,im pretty sure the 2nd one is 2wd,or off the old 4.3 tbi systems. I cant remember. im sure the 1st one is the one you want. if you want il look at my 2wd later and see which one it has.

 

That would be great. Do they both have a check valve inside them?

 

yes they do.

 

Is this diagram correct? I've been drawing it as I go to help troubleshoot. Feel free to correct my mistakes! it's for my 94 4.3W 4WD.

 

i think so.
http://www.justanswer.com/chevy/35y8...automatic.html

this guy posted some diagrams. its kinda poor quality pics,but may help. imma do some more googling and find some pics.

 

Thanks. Yeah, that's one of the pics that confused me because the 4wd and 2wd have the same chk valve. But they are really helpful.

 

I'm gonna post my drawing in a new thread and let everybody comment along with you.