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73-87chevytrucks.com
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73-87 Chevy _ GMC Trucks
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Performance
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Vacuum Leak
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Topic: Vacuum Leak (Read 8250 times)
team39763
Senior Member
Posts: 1194
Re: Vacuum Leak
«
Reply #15 on:
September 30, 2009, 08:43:38 PM »
No air injection. Doesn't look like it ever did. I don't see a EGR valve or anything. I have both valvecovers coming together at one T-fitting and then venting to the throttlebody.
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team39763
Senior Member
Posts: 1194
Re: Vacuum Leak
«
Reply #16 on:
October 01, 2009, 09:53:29 AM »
I think I'm gonna try adding a valvecover breather/filter. When I took off the oil cap, the whistle went away, so maybe the motor needs better crankcase breathing? I'll give it a try and see what happens.
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VileZambonie
Global Moderator
Senior Member
Posts: 19021
Re: Vacuum Leak
«
Reply #17 on:
October 01, 2009, 10:23:19 AM »
Wait, you have both valve covers going to a vacuum source? That's a no no. One should be a PCV valve with a hose going to the large vac port the other should just be a filter vented to the air.
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, ___
/ _ _ _\_
⌠ŻŻŻŻŻ' [☼===☼]
`()_);-;()_)--o--)_)
74 GMC
,
75 K5
,
84 GMC
,
85 K20
,
86 k20
,
79 K10
team39763
Senior Member
Posts: 1194
Re: Vacuum Leak
«
Reply #18 on:
October 01, 2009, 07:08:07 PM »
That's how the truck was when I bought it, but I just fixed that with a filter. I'll see how it sounds in a bit.
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Vacuum Leak