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which if these two vac valves is right?

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Old 11-02-2013, 11:49 AM
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Default which if these two vac valves is right?
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!
 
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Old 11-02-2013, 11:50 AM
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you forgot to upload the other. only see 1.
 
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Old 11-02-2013, 11:52 AM
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Second one...
 
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Old 11-02-2013, 11:53 AM
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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.
 
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Old 11-02-2013, 12:17 PM
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That would be great. Do they both have a check valve inside them?
 
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Old 11-02-2013, 12:20 PM
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yes they do.
 
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Old 11-02-2013, 03:29 PM
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Default Diagram
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.
 
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Old 11-02-2013, 03:37 PM
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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.
 
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Old 11-02-2013, 03:41 PM
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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.
 
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Old 11-02-2013, 05:03 PM
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I'm gonna post my drawing in a new thread and let everybody comment along with you.
 
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