Vaccum hoses

ACER516

MEMBER
1992 BUICK CENTURY
98,000 MILES

Does anyone know where to get a diagram of vacuum hoses for a 92 Buick Century v6 3.3 3800 engine automatic.I replaced one hose coming from canister going to firewall. At the firewall there is a 3 way junction.I see one line going to a wiring harness on the left side at firewall the other one I can't see where it goes. The idleing was fast and engine light on I jiggled that line of hoses and the ideling died down to normal.I suspect that one other line in this 3some is also bad.I am wondering if that line goes to the tranny

5 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Is it a 3.3 or a 3.8?

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Saturday, November 26th, 2011 AT 11:38 PM

ACER516

MEMBER
39 POSTS

Its a 3.3L iI subscribed to Mitchell and got the diagram it says goes to vac brake booster I also have a haynes book it tells how to test brakes for leaks.I am suspecting I have a leak or low on fluid and maybe air in lines. My engine lite stays on but goes out occasionally.I replaced a 2' vac line above the canister which is connected to a 3 way port at firewall one line goes into a cluster of wires leading to cabin diagram says goes to accessories the other one goes to vac brake booster. Had oil changed today told them to replace pcv valve told me it don't have one. Said some engines don't have one on diagram it shows it at intake manifold.I will check my fluid in master cyl how full should cylinder be from top.