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Old 02-06-2016, 09:21 PM   #1
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Can anyone fill me in on what this part is? Located just behind the battery on the left side of the bay, only concerns me because there's air of some sort coming out of the hole on the left side, want to make sure I'm not missing a hose connection of some sort.

This is a '90 with a 302, btw. Truck's still new to me so trying to learn all I can and identify any problems!

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Old 02-08-2016, 02:19 PM   #2
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Any ideas?

Alternately, someone could point me in the direction of a good 302 blow-up or diagram and I can figure it out myself. I have an older Haynes manual but it doesn't have a full image of the 302 specifically with labeled parts, etc.
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Old 02-08-2016, 02:29 PM   #3
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Could be a check value for the smog system. Where does the other end of the line connected to it go?
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Old 02-09-2016, 09:03 PM   #4
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Quote:
Originally Posted by dustyknuckles View Post
Any ideas? Alternately, someone could point me in the direction of a good 302 blow-up or diagram and I can figure it out myself. I have an older Haynes manual but it doesn't have a full image of the 302 specifically with labeled parts, etc.
PM me with your email address. I'll send what I have.
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Old 02-09-2016, 11:54 PM   #5
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The part on top is where air from air pump blows off to atmosphere, it's a one way valve so contaminants can't get into air pump. Part below that is a filter for air entering the air pump. The air from the air pump goes to one of three places, cylinder heads, catalytic Convertor or blows off to atmosphere. I'd seen a write up at one time on the forum on the logic of the system, if I remember correctly the pump is used until operating temp is reached then blows to atmosphere.
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Old 02-12-2016, 10:11 PM   #6
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Quote:
Originally Posted by sdmartin65 View Post
The part on top is where air from air pump blows off to atmosphere, it's a one way valve so contaminants can't get into air pump. Part below that is a filter for air entering the air pump. The air from the air pump goes to one of three places, cylinder heads, catalytic Convertor or blows off to atmosphere. I'd seen a write up at one time on the forum on the logic of the system, if I remember correctly the pump is used until operating temp is reached then blows to atmosphere.
Cool thanks for the info, just wanted to make sure I wasn't missing a hose or other part!
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