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JJ answers this very clearly above >
Posted by Bill Davies [Email] (more from Bill Davies) on Sat, 13 Oct 2007 02:57:31
In Reply to: Re: Vacuum lines in the dash, Broken_arrow, Thu, 11 Oct 2007 15:50:22
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the hose to the MAP transducer doesn't go though the firewall, just to the transducer. That's it - you can see two other lines heading back round the manifold and down the firewall but these come from the fuel rail and are fuel lines, not vacuum/pressure hoses.
Sorry - see that I wrote "blow-off gauge" when I meant "blow-off valve", which will have muddied the waters. Actually, it doesn't so much blow off as dump/recirculate back into the system. It can be another source of leaks both internally at at connections. So whatever else you do, I suggest you replace the thin hose leading from the Y-piece to this valve, because it deteriorates with heat, becomes brittle and leaks for a pastime.
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